Indian Deep-sea Dredging. 



447 



Family Cuspidariidse. 



19. Cuspidaria^ sp. 



Four s]iecles, all from the Andaman Sea between ISS and 

 405 fathoms. 



Family Verticordiidae. 

 20. Verticordia [Euciroa] ehurnea^ sp. n. 



Allied to Euciroa elegantissima, Dall. 



The shell in the dry state is of a beautiful ivory-white 

 externally, discoloured slightly at the ventral margin by the 

 epidermis ; internally it rivals Trigonia in its pearly lustre. 



The external surface is traversed from beak to ventral 

 margin with numerous ridges which bear sharp fluted conical 

 spinelets. Tiiese ridges are best and most regularly deve- 

 loped about the middle of the shell, being few and wide 

 apart and ventrally incomjilete anteriorly, while posteriorly 

 they are irregularly crowded together. The intervals between 



Fis. 14. 



Verticordia {Euciroa) ehurnca. — a, from tlie left side ; h, ddrsal view of 

 the right valve ; c, the same of the left valve ; d, ossicle still 

 attached to the ligameut of the right valve. All natural size. 



the ridges are finely granulated. The left valve is slightly 

 smaller than the right, into which it fits ventrally, and has 

 only one tooth — a posterior lateral. The right valve has a 

 posterior lateral tooth, which is anterior to that of the opposite 



31^ 



