52 
Lariosauridce. 
Table-case, 
No. 17. 
Table-case, 
No. 18. 
A cast of Lariosaurus JBalsami and two original and nearly 
entire skeletons of Neusticosaurus pusillus from the Trias of 
Stuttgart may be seen in the cases. 
In Nothosaurus the skull is long and narrow with the post- 
orbital portion larger than the preorbital and with very long 
and narrow supratemporal fossa3 ; the upper teeth are numerous, 
and the 5th and 6th maxillary teeth much enlarged, the 
mandibular symphysis is of moderate length and bears 5 teeth ; 
the dorsal vertebrae have very short transverse processes. 
Conchiosaurus is closely allied to Nothosaurus ; C. clavatus , 
was about one half the size of N. mirabilis. 
The genus Mesosaurus, a reptile discovered in the Karoo 
formation, Griqualand, S. Africa, and since met with in Brazil, 
is included in the same order with Nothosaurus. One of the 
most peculiar features in this genus is the separation of the 
fourth and fifth tarsalia, so that each metatarsal articulates* 
Fig. 71. — Ventral aspect of left pectoral limb 
of Mesosaurus tenuidens (P. Gervais), from 
the Karoo System (Trias), Griqualand West 
(South Africa) ± ent. entepicondylar 
foramen of humerus; r, radius; u, ulna 
(see Table- case No. 18). 
Fig. 72. — Ventral aspect of right humerus 
of Conchiosaurus davatus (Meyer), Mus- 
chelkalk of Nurnberg (| nat. size); en 1 /, 
entepicondylar foramen ;a, ectepicondylar 
groove. 
with a distinct tarsale. The centra of the vertebrae have a 
notochordal canal, and are small in comparison to the neural 
arches ; while the ribs were anchylosed to the vertebrae, and were 
of great thickness like those of Nothosaurus. Abdominal ribs 
were also present. The skull was much elongated, and furnished 
with slender recurved teeth, implanted in distinct sockets. 
