67 
Diplospondylidce and Archcegosanridce. 
from Bohemia ; Eosaurus , from Nova Scotia; Nyrania, from 
Bohemia; Ichthy erpetum , from Jarrow Colliery, Kilkenny ; Den - 
drerpetum , from the Lowest Permian, Bohemia; Brachyops , 
from the Permian, Mangali, India; Bothriceps and Micropholis , 
from South Africa. 
Fig. 89. — Bothriceps huxleyi (Lydekker). Frontal aspect of the skull ; from the 
Karoo system of the Orange Free State, South Africa, 
In Bothriceps the surface of the cranium is closely and 
irregularly pitted ; the orbits are placed near the middle of the 
skull. This small form measures about 2^ inches in length, and 
2 in breadth. It was obtained from the Karoo beds (Triassic?) 
of South Africa. 
In the Diplospondylidj: the vertebrm, at least in the caudal 
region, consist of an anterior centrum carrying the neural arch, 
and a posterior intercentrum to which the chevrons are united ; 
these intercentra correspond with those of Glepsy drops among 
the Anomodontia. This type of structure being known as 
emholomerous. 
In Gricotus the skull is long and triangular with a narrow 
muzzle, and the ovoid orbits are situated in the hinder half; 
the cranial bones are sculptured; the vertebral bodies are per- 
forated ; the tail long and the body protected by scutes. (This 
is not at present represented in the Collection.) 
In the AiiCHiEGOSAUKiD^ each vertebra of the trunk, in Tri- 
merorachis and Archcegosaurus , consists of four portions,* namely, 
a basal intercentrum (hypocentrum), a pair of pleurocentra, 
and a neural arch. This is known as the rhachitomous type of 
vertebra. These are Labyrinth odonts of moderate size, having 
cylindrical teeth of varying size with only slight infoldings of 
* See Fig. 92, infra, p. 69 ; vertebra of Euchirosaurus , illustrating this 
rhachitomous type of vertebra. 
6 2 
Table-cases, 
Nos. 23 and 
24. 
Wall-case, 
No. 11. 
