840 MESSES. MKLVTLL AND STANDEE OX [Nov. 13, 



liuudred in number, closely running togetlier, evei'v tliird or t'oui'tli 

 row possessing larger spinose excavated squama^; many of them 

 sliglitly curved at the apex, others ei-ect, straight; tliese spines 

 are much worn oft' towards tlie umbones. The form of the shell is 

 almost identical with that of the much smaller 6'. {Fragi(m)torresi 

 E. A. Sm., from the Torres Sti'aits*, l^ut the sculptuie is (luite 

 dift'erent. Smaller examples, hardly adult, exist in greater or less 

 degree in the shell-dredging at 15 fathoms in the (Uilf of Oman. 

 The larger examples come from Mussandam. It seems also allied 

 to C. {Fulria) peramabilis Dall, Bull. Mus. Comp. Zool. Harvard 

 (1885-6), p. 269, pi. iv. fig. 7 : described by Dr. Dall as one of the 

 most exquisite aiid elegant shells known. And C. lOO-Uratuvi 

 must rival this when in its complete beautj^ but, unfortunately, 

 no absolutely perfect specimen has yet been obtained. 



Remicardium (CruNOCARDiA) ADAMSi iieeve. 



P.O. Gulf of Oman, Maskat. Dredged at 10 fathoms, sandy- 

 mud l)ottom. 



Hemicardium (Ctenoc'Ardia) forxioatum Sowb. 



P.G. Gulf of Oman, Maskat. At 15 fathoms, fine, handsome, 

 and not infrequent. 



An Erythraean species, very beautiful. Allied in form to 

 speciosum Ad. k. Rve., but of different texture and arrangement 

 of scaly lamellae or spinelets. 



Hemicardium (Luxicardia) auricula Forsk. 



P.G. Gulf of Oman, Maskat. 10 fathoms. We place here, 

 provisionally, a solitary and imjjerfect specimen, the only one 

 received. As it is an Erythraean species, and likewise occurs 

 coiumonly in the Gulf of Mauaar, further south, it is most 

 probably a true inha,bitant of the i-egion now under treatment. 



Fani. Tridacxid^. 

 Tridacxa crocea Lands:. 

 P.G. Juvenile examples only. Exact locality not defined. 



Fam. Chamid,e. 



Ohama fragum Reeve. 



P.G. Found once or twice on the telegraph -cable at from 

 30-55 fathoms. 



Chama macrophylla Chemn. 



P.G. Gulf of Oman. We have carefully compared the only 

 example with the British Museum series, and cannot find any 

 species nearer than the West Indian macrophylla. 



* Rep. 'Challenger,' Zool. \ol. \iii. j). IGi, pi. viii. iigs. 4, 4«. 



