7lO DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 7, 



Distribution. C. Breton (De Folin), throughout the Mediter- 

 ranean to Egypt, Adriatic, Canaries; 0-120 fms. 



Fossil. Miocene and Upper Tertiaries : Coralline and Red Crag, 

 Austrian Empire, Switzerland, S.W. and S. France, Algeria, Italy, 

 Greece, Rhodes, Cyprus, Madeira. Post-tertiary : Calabria. 



Syn. C. gryphica and O. bicornis (ex typ.), Linue, C. sinistrorsa, 

 Brocchi (not Bruguiere), G. cavernosa, Risso, O. squamata and 

 several other so-called species of Deshayes, C. circinata, Monte- 

 rosato. 



Family XIII. Cyprinid^. 

 f- IsocARDiA COR, Limic. 



Ghama cor, L. S. N. p. 1137. 



I. cor, B. C. ii. p. 298, pi. vi. f. ] ; v. p. 182, pi. xxxvi. f. 1, 1 a. 



'Porcupine' Exp. 1869 : St. 10, 13, 1.5, 16, 17, 19, 25, 30, 31, 

 40. 1870: Atl. 2, 3, 8, 9, 13, 10, 17, 17a, C. Sagres, 26-30, 

 36 ; Med. Capo de Gata, 45, 50, 50 a, oif Jijeli, 55, Easel Amousb, 

 Adventure Bank. 



Distribution. N. Atlantic from LofFoden Is. to the Azores, Medi- 

 terranean, Adriatic, ' Valorous ' Exp. ; 4-1 785 fms. 



Fossil ; adult and fry. Miocene and Upper Tertiaries : Coralline 

 and Red Crag, Antwerp Crag, Continental Europe, S. France, Italy, 

 Algeria, Greece, Asia Minor. Post-tertiary : Scandinavia, Calabria ; 

 0-80 ft. 



The fry or very young is the Kellia abyssicola of Forbes, Venus ? 

 miliaris of Philippi, and Kelliella abyssicola of Sars. I have occa- 

 sionally found it with the adult, and could satisfy any one by showing 

 him a complete and connecting series. The fry is nearly globular, 

 white, smooth and glossy : the sliape gradually and in course of 

 growth changes to squarish ; the colour becomes streaked with 

 reddish-brown ; and the surface is covered with a fine pilous epi- 

 dermis, which is composed of short setse arranged lengthwise in 

 close-set rows. The adult is somewhat angular ; and the epidermis is 

 very thick and velvety, although still retaining the longitudinal setae. 

 In every state the shell is more or less tumid. The teeth are deve- 

 loped by degrees. In all probability the fry, when protruded from 

 the ovary, swims or floats for a time on the surface of the sea, like 

 the fry of the oyster, and thus occurs at all depths. 



Homes has united with this species /. lunulata and I. crassa of 

 Nyst, I. rustica of Conrad (from the American Miocene formation), 

 and /. fraterna of Say. But these identifications require further 

 examination. 



V Cyprina islandica, Linne. 



Venus islandica, L. S. N. p. 1131. 



G. islandica, B, C. ii. p. 304, pi. vi. f . 2 ; v, p. 182, pi. xxxvi. f. 2. 

 'Porcupine' Exp. 1869: St. 2 (living), 9, 28, Lough Swilly, 58. 

 Distribution. Iceland to Arcachon,andN.E. America; 0-100 fms. 

 Fossil. Upper Tertiaries and Post-tertiary : Europe, Siberia, 

 Baring Land, and N.E. America ; 0-1360 ft. 



