Body smooth, without pores; lateral line of pores distinct; top of the head with two porous bands: dorsal and caudal crests irregularly and deeply notched.
T. vittatus, Grays Mss.
Entire length four inches six lines.
Skin smooth: top of the head and parotids with scattered pores: a series of distant pores on the lower part of the sides between the fore and hind legs. Male in summer with a high, deeply notched, dorsal crest, commencing in front of the eyes, and with a deep notch over the vent; continued into a low entire crest extending the whole length of the tail. Colour white (yellow? when alive), with unequal black spots; tail black; belly, under sides of the legs and tail, and a broad streak along each side of the body and tail, white.
Var. ß. Throat white, with a few spots; upper part of the tail pale, black-spotted: dorsal crest very low; caudal crest distinct.
Var. γ. Above black, beneath white; throat black-spotted: dorsal crest none.
A new species, discovered in ponds near London, by J. E. Gray, Esq. to whom I am indebted for the above description. It diifers remarkably from both the preceding species in the form of the dorsal crest, and in the disposition of the colours. From the T. palustris, it may be further distinguished by its smooth skin.