466 MANUAL OF THE MOLLUSCA. 
CRASSATELLA, Lamarck. 
Synonyms, Ptychomya, Ag. Paphia (Lamarck, part) Roissy. 
Type, C. ponderosa, Pl. XXI., Fig. 4. C. pulchra, Fig. 259 
Etymology, crassus, thick. : 
Shell solid, yentricose, attenuated behind, smooth or con- 
centrically furrowed; lunule distinct; ligament internal ; 
margin smooth or denticulated; pallial line simple; hinge- 
teeth 1.2, striated, in front of cartilage pit; lateral teeth 0O—1, 
1—0; adductor impressions deep, rounded; pedal small, 
distinct. 
Animal with mantle-lobes united only by the branchial 
septum ; inhalent margins cirrated; foot moderate, compressed, 
triangular grooved; gills smooth, unequal, outer semi-lunar, 
inner widest in front; palpi triangular. 
Fig. 259. Crassatella pulchra. Sandy Cape, J. B. Jukes. 
Animal as seen on the removal of right valve, and portion of the mantle. 
In Orassatella pulchra the animal is like Astarte ; foot lmgui- 
form, slightly grooved; palpi short and broad, few-plaited ; 
outer gill narrower in front. ey. 
Distribution, 34 species. Australia, New Zealand, Philippines, 
India, West Africa, Canaries, Brazil. 
Fossil, 64 species. Neocomian —. Patagonia, United States, 
Europe. 
JTsocARDIA, Lamarck. Heart-cockle. 
Etymology, isos, like, cardia, the heart, 
Type, 1. cor. Pl. XX., Fig. 3. 
