PL ESI OS A TJR1A. 
139 
Comp. No. 
F 21 part of skull of Ichthyosaurus. Street. Presented by 
T. Hawkins, Esq. 
22 part of skull of Ichthyosaurus. Street. Presented by 
T. Hawkins, Esq. 
Fossils from the Oxford Clay of Peterborough. 
Exhibited in Cabinet D in the Lecture-room. 
Pemains of a new species of Plesiosaurus (Porter Collection). 
Shelf. No. 
1 1 
2 
3,4 
5 
6—9 
10 , 11 
12—13 
2 
3 
1 
2—17 
Plesiosaurus philarchus. 
lower jaw 29^ inches long, with sockets for 38 
teeth on each side and some teeth in situ. The 
teeth rapidly decrease in size, and the hindermost 
are very small. Symphysis 9^ inches long, 
portion of anterior termination of head a foot long, 
exhibiting sockets for 14 teeth on one side. The 
first five are in the pre-maxillary bones, the fifth 
and sixth are small. 
right and left humeri. The humerus is 14^ inches 
long, thick at the proximal end, thin and broad 
at the distal end, like Pliosaurus. 
scapula; it sends a strong process outward and 
backward. 
undetermined fragments, probably pubic bones, 
right ischium and left ischium, 
right and left femora. The femur is 17 inches long, 
very strong, with a large head. On the middle 
of the posterior border it gives otf a small tro- 
chanteroid process, which may be compared with 
the middle trochanter on the femur of a Dino¬ 
saur. 
29 bones of the carpus, tarsus, and fore-arm, &c. 
60 phalanges, 
vertebral column, 
anchylosed atlas and axis. 
cervical vertebrae, very slightly cupped, with short 
straight cervical ribs, expanding a little from side 
to side at the terminal end. The early vertebrae 
