130 
ICHTHYOSA URIA 
Case. Shelf. Specimen. 
Whitby; it is apparently left, and shows the 
under side. It is remarkably expanded at 
the distal end. 
88 f 5—6 right and left humerus of a small Ichthyosaur 
from Whitby. They differ more from the 
specimens in the Cambridge Greensand than 
these differ among themselves; but conform 
in all the characteristic structures of the 
bone. 
f 7 cast of the basi-sphenoid bone of Ichthyosaurus; 
the original in the collection of Mr Wetherell. 
Presented by Mr Charles worth. 
f 8 left coracoid of Ichthyosaurus, slightly crushed 
at the humeral end, but showing the emar- 
ginate and extended posterior border entire. 
Anteriorly it is a little broken, but never 
had the deep anterior post-scapula emargin- 
ation near the humeral end which charac¬ 
terizes some species. 
88 g 1 the pick-axe or T-shaped bone of the pectoral 
girdle of Ichthyosaurus, called the inter¬ 
clavicle by Mr Parker, and episternum of 
authors. The long haft-like part is com¬ 
pressed so as to be expanded from side to 
side; it overlaps externally the median 
union of the coracoid bones. The cross¬ 
piece corresponding to the iron of the pick¬ 
axe is much thickened and narrow from side 
to side; this cross-piece is superimposed 
externally on the clavicle. Between the 
clavicle and the coracoids are the scapulae so 
that the [episternum or] inter-clavicle is a 
cross bracing bone which holds the pectoral 
girdle together. 
g 2 a large and instructive coprolite. It has a few 
coils like a univalve shell, and shows a num¬ 
ber of fish scales, &c. on the surface of the 
