(Gr. marsipos, a pouch; bragchia, gill). The order of Fishes comprising the Hag-fishes and Lampreys with pouch-like gills.
(Lat. marsupium, a pouch). An order of Mammals in which the females mostly have an abdominal pouch in which the young are carried.
(Lat. mastico, I chew). Applied to parts adapted for chewing.
(Lat. marrow). Applied to the marrow of bones ; or to the spinal cord, with or without the adjective "spinalis."
An order of Hydrozoa, commonly known as Jelly-fishes (Discophora, or Acalephae), so called because of the resemblance of their tentacles to the snaky hair of the Medusa. Many Medusas are now known to be merely the gonophores of Hydrozoa.
Resembling a Medusa in shape.
Like a Medusa; used substantively to designate the medusiform gonophores of the Hydrozoa.
(Lat. nicto, I wink). The third eyelid of Birds, etc.
(Lat. the chin). The basal portion of the labium or lower lip in Insects.
(Gr. meron, thigh ; stoma, mouth). An order of Crustacea in which the appendages which are placed round the mouth, and which officiate as jaws, have their free extremities developed into walking or prehensile organs.
(Gr. mesos, intermediate ; enteron, intestine). In a restricted sense, the vertical plates which divide the somatic cavity of a Sea-anemone (Actinia) into chambers.
(Gr. mesos, middle; pous, foot). The middle portion of the "foot of Molluscs."
(Gr. mesos, intermediate; sternon, the breast-bone). The middle portion of the sternum, intervening between the attachment of the second pair of ribs and the xiphoid cartilage (xiphistemum).
(Gr. mesos; and thorax, the chest). The middle ring of the thorax in Insects.
(Gr. mesos ; and zoe, life). The Secondary period in Geology.
(Gr. meta, after ; karpos, the wrist). The bones which form the "root of the hand," and intervene between the wrist and the fingers.
(Gr. meta, implying change; morphe, shape). The changes of form which certain animals undergo in passing from their younger to their fully-grown condition.