322 ON THE MARINE MOLLUSCA OF ASCENSION ISLAND, [Apr. I, 



Cryptodon, sp. 



Hab. Ascension Island, 420 fathoms (' Challenger '). 



Cardium (Fragum) medium, Linn6. 



Hab. "West Indies. 



Two separate valves obtained by Dr. Conry possess all the features 

 of this well-knovpn form. It has not, I believe, l)een previously 

 recorded from the eastern parts of the Atlantic. 



Arca sanct^-helen^, Smith. 



Hab. Ascension {Meiklejohn) and St. Helena. 



Arca (Acar) domingensis, Lamarck. 

 Hah. Ascension {Conry and Trimen). 



Arca (Acar) lactea, Linne. 



Sab. Ascension {Conry). 



This species occurs in the Mediterranean, British seas, ^Yest Africa 

 at the Cape Verde and Canary Islands, and South Africa. Jeffreys 

 has also quoted it as a Red-Sea form. 



Nuculana jeffreysi (Hidalgo). 



Hab. Ascension Island, 420 fathoms {^Challenger''), off the 

 Azores in 1000 fathoms (' Challenger''). Off the west of Ireland, 

 165-1443 fath. {'Porcupine' Exp., 1869) ; off Portugal, 740-1095 

 fath. (' Porcupine ' Exp., 1870). 



Spondylus, sp. 



A number of odd valves of a species of this genus were presented 

 to the Museum by Dr. Meiklejohn, and a single valve was also received 

 from Dr. Conry. The largest specimen is four and a half inches in 

 diameter. All the valves are very much worn, so that it is impossible 

 to identify them specifically. The colour is bright purple-red and 

 the surface is covered with numerous radiating ridges, some of which, 

 more or less far apart, are larger than the rest, and on the deeper valve 

 appear to have been strongly nodose at distant intervals. 



Malleus regula (Forskal). 



Hab. Ascension {Conry) ; Red Sea and Philippines. 



Two young specimens, which appear to belong to this species, is 

 all the evidence we have of the occurrence of this species in the 

 Atlantic. 



OsTREA cucullata, Bom. 



Hab. Ascension {Conry and Chemnitz) ; Red Sea, Indian Ocean, 

 Philippines. 



Dr. Conry's specimen is in fresh condition and, although a little 

 smaller, is very like Chemnitz's figure 679 a (Conch. Cab. vol. viii. 

 pi. 74). He named tliis spc^cies 0. cornu-copice and O. furskalii, tlie 

 latter from Red-Sea examples. 



