1865. | DR. J. E. GRAY ON THE AMPHISBANIANS, 453 
this specimen, with the name of Lepidosternon grayii, informing me 
that he had described (or intended to describe) it in the ‘ Proceedings 
of the Zoological Society’ under that name. I cannot find that it 
has been so described, nor can I find any notice of it in any other 
work, though it is very like, but evidently distinct from, the Lepido- 
sternon phocena of Duméril and Bibron, figured by M. d’Orbigny 
(Voy. Amér. Mérid.). 
Lepidosternon grayii. 
3. LepIpOsTERNON PHOCENA, Dum. et Bibr. Erp. Gén. v. 507; 
Gray, Cat. Tortoises, &c., B. M. 73; D’Orbigny, Voy. Amér. Mérid. 
Rept. t. 6. f. 7-10. 
Head broad ; the vertebral plate elongate, small, larger than broad, 
acute at each end; the frontal and occipital plates large, shorter than 
broad, the frontal the largest ; the parietal plates short, broad, band- 
like ; the plates of the sternal disk uniform, symmetrical, oblique. 
Hab. Buenos Ayres (Bridges, B. M.: stuffed). 
M. d’Orbigny’s figure is very like the preceding species; but the 
head is represented shorter, the frontal plates are rather larger. The 
long occipital shield of that species is here represented by two pairs 
of square shields, as if the large plate of the former species were 
divided across; it also appears to be a shorter, thicker species. 
The stuffed specimen which we received from Mr. Bridges agrees 
with the figure in all these particulars ; but the head appears rather 
larger, perhaps from its being rather distorted in the preparation. 
Both the figure and the specimen belong to a species evidently 
very distinct from LZ. grayii, and much thicker. 
Tribe 2. CepHALOPELTINA. The head depressed, covered above 
with a single simple or transversely divided, flat, horny, nail-like 
shield ; pectoral disk formed of elongated, symmetrical shields ; 
the dorsal and lateral lines very narrow, indistinct, except near 
the hinder part of the body. 
A. The pectoral disk formed of large, diverging, unequal, polygonal, 
symmetrical shields ; crown-shield divided into two by a trans- 
verse suture. America. 
Crpuarorettis, J. Miiller, Tied. Zeitsch. fiir Phys. 1831, iv. 269. 
Head covered with two large shields, the front one smaller ; the 
