FROM THE LIAS. 
123 
ICHTH Y OSAURIA 
FROM THE LIAS. 
Remains illustrative of the Osteology of the genus in the 
Liassic asra. 
Exhibited in Cabinet LXXXVIII. 
Case. Shelf. Specimen. 
88 a 1—2 mid-dorsal vertebrae; the cupped articulation 
subcircular in outline and 8 inches in di¬ 
ameter ; back to front measures 3 inches. 
In Liassic Ichthyosaurs the tubercles for 
the rib are near to the anterior margin of 
the side, and the lower tubercle is more 
anterior than the upper one. In these spe¬ 
cimens both are at the middle of the side, 
and, contrary to the usual arrangement, the 
upper tubercle is the larger. The pits for 
the neural arch are deep in front. 
a 3 early caudal vertebra with a single large 
tubercle for the rib at the lower third of 
the side. The intervertebral surface is 
flattened, of a broad ovate outline; narrow 
above, 5| inches high; two inches from 
front to back. 
a 4 32 associated terminal caudal vertebrae of a 
young Ichthyosaurus. These vertebrae are 
