1 iidtan Dcop-aea Drcihjhuj. 



447 



Family Cuspidariidae. 



19. Cuspidaria^ sp. 



Four species, all from the Andaman Sea between 188 and 

 405 fathoms. 



Family Verticordiidae. 

 20. Verticordia {Eaciroa) churnea^ sp. n. 



Allied to Eaciroa elegantissima^ Dall. 



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

 externally, diseoloured 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. These ridges are best and most regularly deve- 

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

 apart and ventrally incomj)lete anteriorly, while posteriorly 

 they are irregularly crowded together. The intervals between 



Fiff. U. 



Verticordia {Euciroa) ebunica. — a, from tlie left side ; h, dm-sal view of 

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

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



the ridges are finely granulated. The left valve is sliglitly 

 smaller than the right, into which it tits ventrally, and lias 

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

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



81* 



