MOLLUSCS, VERMES AND HYDROZOA 



FIG. .186, Lampsilis ochraceus. Adult. 



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 



2^ inches in length, 2 inches broad 



and ly^ 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 



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- 

 FiG.ii7.L.mfsi/isc.ricsus. Adult. colorcd tint. The Cardinal 



teeth are oblique and the laterals short. It grows to a length of 3 inches, 

 the male being i^ and the female 2}^ inches broad and 1}^ 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 

 its longevity in the aquarium. 



Anadonta. 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. 



J. cataracta. Fig. 188, more generally known as A.fluviaHlis,gYt&t\y 

 resembles A. cygnia of Europe and has thin transversely sub-oval inflated 

 valves with distinctly outlined umbones, placed well to the anterior end of 



243 



