17 
AMMONITES. Benettianus. 
TAB. DXXXIX. 
Spec. Cuar. Subglobose, with two rows of 20 
large tubercles around the front, and one row 
composed of half the number upon each side ; 
whorls few, crossed by large obtuse radii that 
connect the tubercles, the inner ones partly 
exposed ; aperture transversely oblong. 
EE 
Nive or ten large conical tubercles compose the row on 
each side, while double that number fill the other two 
rows; the transverse rays are more conspicuous as well 
as more numerous between the rows of knobs than upon 
the inner sides of the whorls, and are quite lost upon the 
narrow space over the siphunculus. In the very young 
shell the aperture is round, and the tubercles are not 
formed ; as it advances in growth the aperture becomes 
wider, and the tubercles rise from the ribs and are soon 
very prominent, those upon the sides being always the 
largest : the tubercles are conical, obtuse, not at all ap- 
proaching to cylindrical as in A. proboscideus t. 310; it 
is also a :arger shell. 
Found among Clay, mixed with green-sand, that is used 
for making tiles at Crockerton, near Warminster. The 
shell remains much decomposed and very soft, filled with 
hard black marl mixed with Pyrites. It was accompa- 
nied by Am. Monile t. 117, Am. dentatus t. 308, and fos- 
sil wood penetrated by Teredines. The shells are in 
the same state as similar ones found at Folkstone, where 
the same bed occurs; but the wood resembles that of 
Highgate: a species of Ampullaria also occurs in the 
same Clay, similar to an unnamed one found cast imsilex 
at Blackdown. 
For the knowledge and use of the specimens of this 
Ammonite we are indebted to the zeal of Miss Etheldred 
Benett, whose labours in the pursuit of geological in- 
formation have been as useful as they have been inces- 
sant. 
