PLATE 36. 
IG ah ROD UCTUS: GIGAN RE Sin carers oie potas eine a a SHia iat aU gent cs aati ay Ree Lio 
a. View of a natural cast of the concave surface of the dorsal valve, 
with a fragment of the ventral yalve attached ; natural size. 
b. Gutta-percha cast of a portion of Fig. 1 a, showing the natural 
surface of the dorsal valve, except that the numerous small 
spinules are not well shown. They are represented by the dots 
upon Fig. 1a. 
e. Outline of section of the shell along the median line, showing the 
length of the shell from beak to front, which Fig.1 @ does not 
show beeause of the posture of the specimen when drawn. This 
figure is partly diagramatic, but the proportions are taken from 
measurements of specimens in the collection, 
JME Deilins pes COps Oppo! by. OISPDILIKOENE 36 Soy Goa GOe aU SoM bso SOs ooSbbS oobede osseous 
a. Dorsal view of a nearly perfect example, less than full adult size; 
the test partly extoliated. 
b. Latera! view of the same. 
For other figures of this species see plate 33. 
