128 
ICHTHYOSA TJRIA 
Case. Shelf. Specimen. 
88 d 2 crushed head of a short-nosed Ichthyosaur, 
displaying well the composite structure of 
the lower jaw, and showing the nasal bones 
to come far forward between the pre- 
maxillaries. The cranial region is obscured 
with what appear to be the bones of a 
paddle. 
d 
cl 
d 
d 
3 a section through the anterior part of the snout 
of an Ichthyosaurus just before the dis¬ 
appearance anteriorly of the nasal bones. 
There is also a section of the dentary bones. 
The species is reputed to be I. tenuirostris. 
4 anterior part of the upper jaw of a very small 
Ichthyosaurus polished in front and behind; 
showing in front the premaxillary and 
termination of the nasals, and behind the 
premaxillaries, nasals, vomera, and indica¬ 
tions of other bones displaced. The teeth 
are large and minutely striate. 
5 section through the premaxillary and dentary 
bones of an Ichthyosaurus with teeth in situ, 
from Lyme Regis. 
6 fragment of premaxillary bone with numerous 
slender teeth closely packed in the alveolar 
groove, from Lyme Regis. 
88 e 1 portion of the jaws of an Ichthyosaurus crushed, 
fractured in front and behind. On the left- 
hand side, where the premaxillary is broken 
away, the nasal bone is seen under it; and 
behind where the nasal bone is broken away, 
it is seen to overlap the frontal. On the 
right side the teeth with short crowns are 
well seen. 
