798 MESSllS. MELVILL AND STANDEX ON [NoV. 13, 



Barbatia (Acae) symmetrica Reeve. 

 I. Karachi, rai-ely. 



Barbatia (Agar) tenebrica Reeve. 



I. Karachi. Also Bombay (Ahercromhie). 



N.B. — It is our belief the large B. helhUngi Chenm. (recoi-ded 

 in Oommauder E. R. Shopland's List of Adenese MoUusca) ex- 

 tends its range to the Persian Gulf, though it is impossible at 

 present to corroborate this with specimens in the collection. 



Pectunculus heroicus, sp. n. (Plate LV. fig. 1.) 



P. testa magna, solida, cequivalvi, incequilaterali, orbicidari, 

 convexa,su2}erJicie plana, obscure longitudinaliter midiiradiata, 

 ejndermide ad Qnarginem valvarmn ventralem densa, Jim- 

 hriatida, nigro-olivacea ; lombonibus parvis, incurvis, area 

 ligameittari externa divisis, margine dorsali antice obliquo, 

 postice fere recto, radiis sub lente prtKcipue apud %mnbones 

 pidclwe cancellatis, et trapsversim liratidis; interstitiis obscu- 

 rissiine quadratis ; paghia interna alba, nitida, margine midti- 

 sidcidoso, cardine regidari; dent'ibus ad 24 in xitraque valva 

 instructis. 



Alt. 53, lat. 55, diam. 40 mm. 



Hab. Persian Gulf. 



A large, well-marked Pectunculus, allied most nearly to P. 

 Uvidus Sow., from the Red Sea, mainly difieriiig in being insequi- 

 lateral, the posterior dorsal margin being straight. It has, so 

 far, only occurred very rarely. 



Pectunculus lividus Reeve. 



I. Karachi. An Erythi'a?an species, doubtless occuri-ing in 

 intermediate stations. 



Pectunculus striatularis Lam. 



P.G. Gulf of Oman. Lat. 26° 50' JS'., long. 54° 50' E.; coral- 

 ;sand and mud. 



Pectunculus taylorianus Ang. 



P.G. Gulf of Oman : Maskat. 10-15 fathoms. 

 I. Karachi, but rarely. 



Pectunculus (Axin.ea) maskatensis Melv. 



P.G. Gulf of Oman, Maskat. 10-15 fathoms. 

 A finely sculptured species. 



Pectunculus (Axin^a) pectiniformis Lam. 



P.G. Shaikh Shuaib I. ; dredged at 7 fathoms, muddy sand 

 and loose rocks. Dabai, 8 fathoms. Gulf of Oman, at 15 fathoms 

 beyond Maskat. 



I. Karachi. 



