188 PR. J. E. GRAY ON THE TORTOISES. [ Mar. 11, 
eentral hook; the lower jaw moderately strong, covered in front 
with a convex horny sheath. Toes strong, included in the skin to 
the claws, covered above with band-like shields. 
A skull received from Mr. Oldham, which appears to belong to this 
species, may be thus described :—Skull depressed, nose nearly erect 
from upper lip; crown rather convex, tapering behind ; orbit large, 
circular, lateral, subsuperior; zygomatic arch imperfect, rather 
broad in front, about half as broad as the back edge of the orbit, 
and tapering off behind just before it reaches the upper edge of the 
small circular tympanic cavity; palate flat, broad, with a short 
shallow concavity behind each internal nostril; the lateral edge of 
the upper jaw nearly straight, with a slightly produced broad central 
beak, and with a narrow alveolar plate having a slight groove parallel 
to the short outer edge for the greater part of its length; lower 
jaw weak, erect on the side, shelving in front, with a central conical 
prominence in front, and with a straight, thin, sharp edge, without 
any dilatation of any kind. 
Tribe II. GrocLEMMYDINA. 
3. GEOCLEMMYs. 
1. GEOCLEMMYS GUTTATA. 
A beautiful skeleton is in the British Museum, and a skeleton 
without lower jaw in the Museum of the College of Surgeons, 
no. 9774. 
Skull thin, crown slightly arched, nose erect; orbit lateral, very 
large ; zygomatic arch broad, short; palate flat behind; lower jaw 
slender; side edges of the upper jaw slightly arched, and with a 
notch in front; alveolar groove very narrow, even; mastoid bone 
conical, produced, hollow. Toes short, strong. 
2, GEOCLEMMYS SEB. 
Specimen in spirit in the British Museum. Nose rather pro- 
duced, shelving to the lip below, triangular, soft, in a notch on the 
upper edge of the upper beak ; alveolar process linear, marginal ; 
upper beak with a straight edge and a very slight acute central notch, 
lower hooked and acute in front. Toes short, included in the skin 
to the base, but slightly separate, conical, with a central series of 
narrow six-sided scales above; web very slight, if any. 
3. GEOCLEMMYS MUHLENBERGII. 
An adult specimen in spirit, from North America, with the 
yellow spots on the occiput well-marked. The beaks have an even 
lateral edge and an acute notch in the centre in front; the lower 
beak convex and rounded below; crown rather convex, dark olive, 
with black spots. Toes united in the skin to the claws, with a few 
band-shaped shields above. The upper alveolar surfaces rather 
broadly linear, with a submarginal internal ridge ; the lower with a 
ccntinuous submarginal groove, rather broad, and produced, with a 
sharp edge, in front. 
