716 DR. J. E. GRAY ON THE DERMATEMYD&. [ Nov. 1, 
The intramarginal plates are sometimes divided in halves on one 
or both sides. 
CHLOREMYsS ABNORMIs. (Plate XLII.) 
Animal and shell olive above and white below; upper part and 
sides of the head and neck blackish olive, with a pale streak from 
the back of the eye, over the ear, along the side of the neck. 
Dermatemys abnormis, Cope, Proc. Acad. Nat. Sc. Philad. 1868, 
p. 120. 
Hab. “Yucatan, Belize River (Dr. Parsons).”’ 
Mr. Cope’s, as well as the one in the Gardens, is a young speci- 
men; but he observes, “I cannot suppose the vertebral sentes be- 
come as narrow or the carapace as fully ossified in maturity as in 
the other species.”” In the colouring of the head it resembles the 
figure of M. Auguste Duméril, but not in any other character. 
The young living specimen in the gardens of the Society, 
about 4 inches long, is dull olive-brown above, and pale yellowish 
beneath. The lower surface of the marginal plates olive, the 
sternal and submarginal shields being uniform white. ‘he tail 
is very short, conical, rudimentary. Head black-olive; the end 
of nose red; the upper beak is of the same colour as the head, 
and looks as if covered with skin; but this is not the case, for 
it is very hard. The lower beak paler. There is a very in- 
distinct, broad, rather irregular pale streak from the back edge of 
the eye along the back of the neck. The nuchal plate very small. 
Dorsal scutes very thin. The areolz large, granular; those of the 
vertebral plates in the middle of the hinder margin of the shield ; 
those of the costal plates rather above the middle of the hinder 
margin of the shield; of the margmal plates on the hinder outer 
margin of each shield as visible below as above, rather on the outer 
edge of the middle of the hinder part of the sternal plate, and quite 
on the hinder outer margin of the intramarginal plates. The skin 
of the neck and feet covered with small scales. The outer edge of 
the legs with a well-marked fringe; the front edge of the fore legs 
with numerous, very narrow, slightly curved band-like shields. The 
toes slender, covered above with narrow band-like plates, very 
broadly webbed to the claws. Claws 5 .4, black, slender, and acute. 
Pupil black, surrounded by an olive iris, without any black spot on 
the side asin American Terrapius. The submarginal plates seem 
liable to vary in form and number; for in this specimen they differ on 
the two sides. On the right side there are seven: the first, which is 
probably an axillary plate, is small; then follow three moderate- 
sized, the middle one of which is divided across (this is clearly an 
accidental division) ; then there is a small triangular plate between 
the last and the transverse band-like inguinal plate. On the left 
side, which I should say had the normal structure, there is a rather 
larger axillary plate: three submarginal plates, the hinder being 
the largest, and a transverse band-like inguinal plate. i 
