(12) The Tanganyika languages (Ki-rega, Kabwari, Kiguha, &c). These dialects are chiefly spoken in the regions west-north-west, and perhaps north and east of Tanganyika, from the vicinity of Lake Albert Edward on the north and the Lukuga outlet of Tanganyika on the south. On the west they are bounded by the Congo Forest and the Manyema genus (No. 13). The languages on the east coast of Tanganyika (Ki-rundi, Kigeye, etc.) seem to be more nearly connected with those of group No. 1 (Uganda-Unyoro), yet perhaps they are more conveniently included here.

(13) The Manyema (Baenya) group includes most of the corrupt Bantu dialects between the western watershed of Tanganyika and the main stream of the Luapula-Congo, extending also still farther north, and comprising (seemingly) the languages of the Aruwimi basin, such as Yalulema, Soko, Lokele, Kusu, Tu-rumbu, etc. On the west the Manyema group is bounded by the languages of the Lomami valley, which belong to groups Nos. 15 and 16; on the east the Manyema genus merges into the much purer Bantu dialects of groups Nos. 1 and 12. An examination of the Lihuku-Kuamba section (No. 2) shows these tongues to be connected with the Manyema group. The Kibira dialects of the north-eastern Congo Forest (Ituri district) may perhaps be placed in this section.[6]

(14) The Rua-Luba-Lunda-Marungu group (in which are included Kanyoka, Lulua and Ki-tabwa) occupies a good deal of the south central basin of the Congo, between the south-west coast-line of Tanganyika on the east and the main streams of the Kasai and Kwango on the west, between the Bakuba country on the north and the Zambezi watershed on the south.

(15) The Bakuba assemblage of Central Congo dialects (Songe, Shilange, Babuma, etc.) probably includes all the Bantu languages between the Lomami river on the east and the Kwa-Kasai and Upper Kwilu on the west. Its boundary on the north is perhaps the Sankuru river.

(16) The Balolo group consists of all the languages of the Northern Congo bend (bounded on the north, east and west by the main stream of the Congo), and perhaps the corrupt dialects of the Northern Kasai, Kwilu and Kwango (Babuma, Bahuana, Bambala, Ba-yaka, Bakutu, etc.), where these are not nearer allied to Teke (No. 18) or to Bakuba.

(17) The Bangala-Bobangi-Liboko group comprises the commercial languages of the Upper Congo (Ngala, Bangi, Liboko, Poto, Ngombe, Yanzi, etc.) and all the known Congo dialects along and to the north and sometimes south of the main stream, from as far west as the junction of the Sanga to as far east as the Rubi and Lomami rivers, and those between the Congo and the Lower Ubangi river and up the Ubangi, as far north as the limits of the Bantu domain (about 3° 30′ N.). Allied to these perhaps are the scarcely-known forms of speech in the basin of the Sanga river, besides the "Ba-yanzi" dialects of Lakes Mantumba and Leopold II.

(18) The Bateke (Batio) group. This may be taken roughly to include most of the Bantu dialects west of the Sanga river, northwest of the Lower Congo, south of the Upper Ogowe and Ngoko rivers and east of the Atlantic coast-lands.

(19) The Di-Kele and Benga dialects of Spanish Guinea and the Batanga coast of German Cameroon.

(20) The Fañ or Pangwe forms of speech (so corrupt as to be only just recognizable as Bantu), which occupy the little-known interior of German Cameroon and French Gabun, down to the Ogowe, and as far east and north as the Sañga, Sanagá and Mbam rivers, and the immediate hinterland of the "Duala" Cameroon.

(21) The Duala group, which on the other hand is of a much purer Bantu type, includes the languages spoken on the estuary and delta of the Cameroon river.

(22) The Isubu-Bakwiri group of the coast-lands north of Cameroon delta (Ambas Bay), and on the west slopes of Cameroon Mts.

(23) The Bantu dialects of Fernando Pô (Ediya, Bateti, Bani, etc.) distantly allied to Nos 24, 2 and 13.

(24) The Barondo-Bakundu group, which begins on the north at the Rio del Rey on the extremity of the Bantu field, near the estuary of the Cross river. This group may also include Barombi and Basā, Boñkeñ, Abo, Nkosi and other much-debased dialects, which are spoken on the eastern slopes of the Cameroon mountains and on the Cameroon river (Magombe), and thence to the Sanagá and Nyong rivers. Eastwards and north-eastwards of this group, the languages (such as Mbe, Bati, Nki, Mbudikum, Bafut, Bayoñ) may be described as "semi-Bantu," and evincing affinities with the forms of speech in the basin of the Central Benue river and also with the Fañ (No. 20).

(25) Turning southwards again from the north-westernmost limit of the Bantu, we meet with another group, the Mpongwe-Orungu and Aduma languages of French Gabun, and the tongues of the Lower Ogowe and Fernan Vaz promontory.

(26) These again shade on the south into the group of Kakongo dialects of the Loango and Sete Kama coast - such as Ba-kama, Ba-nyanga, Ma-yombe, Ba-vili, Ba-kamba and Ka-kongo (Kabinda).

(27) The Kongo language group comprises the dialects along the lower course of the Congo from its mouth to Stanley Pool; also the territory of the old kingdom of Congo, lying to the south of that river (and north of the river Loje) from the coast eastwards to the watershed of the river Kwango (and the longitude, more or less, of Stanley Pool).

(28) In the south the Kongo dialects melt imperceptibly into the closely-allied Angola language. This group may be styled in a general way Mbundu, and it includes the languages of Central Angola, such as Ki-mbundu, Mbamba, Ki-sama, Songo, U-mbangala. The boundary of this genus on the east is probably the Kwango river, beyond which the Lunda languages begin (No. 14). On the north, the river Loje to some extent serves as a frontier between the Kongo and Mbundu tongues. On the south the boundary of group No. 28 is approximately the 11th degree of south latitude.