CRETACEOUS MOLLUSCA. 347 
Modiola quadrata. (Tab. XXVIII. fig. 13.) 
Spec. Cuar.—Elongated, curved, longitudinally punctato-striated, gibbose ; 
sides and disc flattened. 
The sides and middle of this shell are so flattened as to give a nearly square 
section. 
Lower chalk. 
CONCHIFERA MONOMYARIA. 
Lima leviuscula. (Tab. XXVIII. fig. 14.) 
Spec. Cuar.—Semicircular, anteriorly truncated, one side straight, com- 
pressed ; surface marked with numerous radiating strie. 
An imperfect specimen. 
Lima? spinosa. (Tab. XXVIII. fig. 33.) 
Spec. Cyar.—Semicircular, anteriorly truncated, ribbed; surface minutely 
corrugated; ribs numerous, rounded, with here and there a squamaform 
spine. 
A rare shell. The generic characters are imperfectly shown in the specimen. 
Lama granosa. (Tab. XXVIII. figs. 24 & 25.) 
Spec. Cuar.—Oblong or elongated, slightly compressed, striated with granu- 
lated interstices ; striz numerous, equidistant, radiating ; hinge-line short ; ears 
small, indistinct. 
This neat, well-defined species of Lima seems to be liable to much variation in 
its general form ; one valve is flat; the lines of growth are conspicuous at di- 
stant intervals. 
Pecten jugosus. (Tab. XXVIII. fig. 26.) 
Spec. Cuar.—Orbicular, flat, radiated with ribs and striz; ribs about fifteen, 
broad, slightly elevated, angular in their middle ; ears large and narrow, ribbed ; 
lines of growth irregular ; striz few. 
The ears of this Pecten are shorter than the diameter of the shell ; the ribs are 
so wide as to meet each other with their flat inclined sides; they are very 
slightly raised. At first sight this bears some resemblance to P. Beaveri, but the 
ears are much smaller and the ribs sharp in the middle. 
