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Show 322 ON THE MARINE MOLLUSCA OF ASCENSION ISLAND. [Apr. I, CRYPTODON, sp. Hab. Ascension Island, 420 fathoms (' Challenger''). CARDIUM (FRAGUM) MEDIUM, Linne. Llab. West Indies. Two separate valves obtained by Dr. Conry possess all the features of this well-known form. It has not, I believe, been previously recorded from the eastern parts of the Atlantic. ARCA SANCT_E-HELEN.E, Smith. Hab. Ascension (Meiklejohn) and St. Helena. ARCA (ACAR) DOMINGENSIS, Lamarck. LLah. Ascension (Conry and Trimen). ARCA (ACAR) LACTEA, Linne. Hab. Ascension (Conry). This species occurs in the Mediterranean, British seas, West 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). Llab. 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, Born. 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 this species O. cornu-copia and O. forskalii, latter from Red-Sea examples. |