
MOLLUSCS, VERMES AND HYDROZOA 

brown, finely ‘radiated and zoned with 
dark olive, and a very dainty rose color 
or violet tint on the inner side. The 
cardinal teeth are nearly parallel with 
the hinge margin and the lateral teeth 
short and less prominent. It grows to 
234 inches in length, 2 inches broad 

and 1! inch thick, but is usually 
smaller in proportion. It is a New 
England species rarely found in the Middle and Western States. 
L. cariosus, Fig. 187, is also variable in form, has moderately thick 
inflated ovate or rounded valves, with the prominent umbones placed well 
towards the anterior end of the hinge, which has a straight narrow margin 
FIG. 186. Lampsilis ochraceus. Adult. 
and a sharp obtuse ridge 
passing towards the poster- 
ior tip. The valves are 
sharply marked with lines 
of growth and have a 
smoothly polished surface. 
The coloris greenish-yellow 
or light-olive, with rays of 
bright-green along the 

upper posterior margin; and 
the inside a bluish flesh- 
colored tint. The cardinal 
teeth are oblique and the laterals short. It grows to a length of 3 inches, 
the male being 134 and the female 214 inches broad and 114 inch 
thick. It is quite generally distributed but most frequently occurs in the 
Connecticut River and its tributaries. No information is at hand as to 
FIG. 187. Lampsilis cariosus. Adult. 
its longevity in the aquarium. 
Awaponta. These mussels reach a considerable size and are usually 
more ovate in form than any of the foregoing. They have siphonal apertures, 
toothless hinges and sharply defined umbones. They are difficult to keep 
alive in smaller aquaria, as their food consist most largely of diatoms and 
infusoria, but will survive in those of running water or in large properly 
balanced aquaria having abundant plant life. There are two generally 
distributed species in the Eastern Atlantic States, both of which grow to 
large size. 
A. cataracta, Fig. 188, more generally known as 4. fluviatilis, greatly 
resembles 4. cyguia of Europe and has thin transversely sub-oval inflated 
valves with distinctly outlined umbones, placed well to the anterior end of 
243 
