350 CRETACEOUS MOLLUSCA. 
Cassidaria incerta. (Tab. XXIX. fig. 7.) 
This is evidently Pterocera incerta of D’Orbigny, but why he has referred it to 
Pterocera, I am at a loss to guess. The present specimen is sufficiently perfect 
to show that it belongs to the genus Cassidaria. The Dolium nodosum (Min. 
Conch. t. 426 & 427) is nearly related, and may even be an old specimen of the 
same species D’Orbigny obtained from the lower chloritic chalk of Mans. 
Found in Sussex. 
CEPHALOPODA. 
Hamates angustus. (Tab. XXIX. fig. 12.) 
Spec. Cuar.—Much elongated, scarcely diminishing in breadth, compressed ; 
sides ribbed; ribs numerous, rounded, equal, discontinued over the concave 
margin. 
A remarkable species. 
Turrilites triplicatus. (Tab. XXIX. fig. 16.) 
Spec. Cuar.—Much elongated, costated ; volutions convex ; coste obliterated 
near the lower part of the whorl by a plain band, below which are three rows of 
small tubercles united by three spiral ridges. 
This species is distinguished from all others by the triple row of small tubercles 
at the base of each whorl. ‘The cost are numerous, distinct and rounded, and 
each has a slight constriction before it reaches the obliterating band. I have 
seen specimens much larger than the one figured. 
