110 



Dredged alive at 17 fathoms, St. Vincent Gulf and Back- 

 stairs Passage, 4; at 18 fathoms. Investigator Straits, one ex- 

 ample; at 45 fathoms, east of Neptune Islands, 1, and 4 

 valves; at 17 and 22 fathoms, many valves; in Spencer Gulf, 

 unrecorded depth, 1 alive, and 6 valves (Verco). 



Var. — Only one individual of a pale tint has the typical 

 radial rays ; most shells are of a pinkish chestnut, especially 

 at the umbos, disposed in dark and light concentric bands; 

 some are deep reddish-brown at the umbos and along the 

 post-dorsal and ventral margins, and have no concentric 

 bands ; others are white. 



