5G0 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Julie 17, 



Distribution. Finmark and Faroe I. to Sicily ; 5-180 fms. 



Fossil. Pliocene and Post-tertiary. Scandinavia, Red Crag at 

 Woodbridge, Biot, Italy; 0-130 ft. 



Among other synonyms is P. rimulosus of Phihppi, who identified 

 it with the present species in his letter to Scacchi in 1S44 Itis 

 not the P. striatus of v. Minister, from the Tertianes of N. W. 

 Germany. 



14. Pecten testae, Bivona. 



P. testes (Bivona MS.), Philippi, Cat. Moll. Sic. i. p. 11, t. v. 

 f. 17 : B. C. ii. p. 67 ; v. p. 107, pi. xxiii. f. 3. 



« Porcupine ' Exp. 1 869 : St. 2, 6, 23a, 25. 1870 : Atl. Vigo B., 

 Tangier B. ; Med. off Jijeli, Benzert Road. 



Distribution. Norway to the JEgem, and the Adriatic ; 10-130 

 fms. The depth from which the Mediterranean cable was recovered, 

 with the specimen attached to it, depending on the information 

 received by Prof. A. Milne-Edwards, is doubtful. 



Fossil. Pliocene. Biot, Monte Mario, and Sicily. 



15. Pecten similis, Laskey. 



P. similis, Lask. Mem. Wern. Soc. i.p. 387, t. viii. f. 8. : B. C. ii. 

 p. 71 ; v. p. 168, pi. xxiii. f. 5. 



'Porcupine' Exp. 1869: St. 1, 3, 6, 9, Galway B., 13, 14, 48, 

 25, 33, 35. 1870 : Atl. 1, 2, 3, 10, 12, Vigo B., 16, 17«, Setubal 

 B., off C. Sagres, 27-30 ; Med. Cartagena B., Rasel Amoush (one 

 valve, striated inside more distinctly than usual, and named by me 

 Pleuronectia Icevis), Adventure Bank, off Rinaldo's Chair. 



Distribution. Finmark to the Gulf of Egina, Adriatic, Madeira, 

 Jamaica, and Corean Sea ; 2-300 fms. 



Fossil. Pliocene and Post- tertiary. Coralline Crag, Glacial bed 

 in Fifeshire, Belgium, Plaisantin, S. Italy, Rhodes. 



Not P. pygmceus of v. Minister, which is a species of Amussium. 



16. Pecten groenlandicus, G. B. Sowerby. 



P. groenlandicus, G. B. Sowerby, Thes. Conch, part ii. p. 57, 

 pi. xiii. f. 40(1842). 



'Porcupine' Exp. 1869 : St. 23a, 40, 47. 1870: Atl. 6, 8, 9. 

 Young only, and in this state closely resembling P. similis ; but the 

 sculpture is very different. The latter species is marked by con- 

 centric stria; in both valves, while P. groenlandicus has in the upper 

 valve numerous impressed lines, arranged lengthwise and irregularly, 

 and the lower valve is microscopically reticulated. 



Distribution. Arctic Seas in the North Atlantic, from Smith 

 Sound to Bergen and the Gulf of St. Lawrence, White Sea and coasts 

 of Russian Lapland ; 5^—1 785 fms. 



Fossil. 82° 27' N. lat, Norway, Scotland, and Maine ; from 30-40 

 ft. in depth to 200 ft. in height. 



The shell is far from being " equivalve," as Sowerby described it. 



P. vitreus of Gray, but not Chemnitz's species of that name. 



