1879,] 'LIGHTNING' AND 'PORCUPINE' EXPEDITIONS, 559 



Distribution. Christiansund to Sicily, Madeira, and the Canaries ; 

 laminarian zone to 78 fms. 



Fossil. Upper and middle Pliocene and Post-tertiary. Scandinavia 

 Great Britain and Ireland, Holland, Belgium, S. France, Italy' 

 Algeria; 0-1 06 ft. . 



It is difficult to separate P. maximus from P. jacobceus. Are 

 they distinct species 1 



+ 10. Pecten feexuosus, Poli. 



Oslrea Jlcxuosa, Poli, Test. utr. Sic. ii. p. 161, t. xxviii. f. 11. 



'Porcupine' Exp. 18/0: Atl. St. 29 ; Med. Benzert Road, Rasel 

 Amoush. 



Distribution. Loire-Iuferieure, Atlantic coast of Spain, Portugal 

 Strait of Gibraltar, Mediterranean, Adriatic, ^Egean, Madeira • 2- 

 1 1 fms. 



Fossil. Miocene, Pliocene, and Post-tertiary. S. France, Algeria 

 and Italy. ° ' 



P. polymorphus of Bronn and Philippi. 



S 11. Pecten glaber, Linne. 



Ostrea glabra, L. S. N. p. 1146. 

 0. citrina, Poli, Test. utr. Sic. ii. t. xxviii. f. 15. 

 'Porcupine' Exp. 18/0 : Atl. St. 30; Med. Algesiras B. 

 distribution. Portugal to Smyrna, Adriatic, Black Sea, and 

 the Crimea; 2-120 fms. 



Fossil. Pliocene. S. France, Algeria, Italy, Morea. 

 Ostrea sulcata of Born, and many other synonyms. 



'-/ 12. Pecten tigrinus, Midler. 



P. tigerinus, Midi. Zool. Dan. Prodr. p. 248. 



P. tigrinus, B. C. ii. p. 65 ; v. p. 167, pi. xxii. f. 2, 2a. 



'Lightning ' Exp. : St. 2, 5. 



'Porcupine' Exp. 1869 : St. 23a, 33, 68, theMinch. 1870: Atl. 

 betubal B. 



Distribution. Iceland and Norway to Vigo ; 5-1 80 fms 

 Fossil Pliocene and Post-tertiary. Norway, Great Britain, 

 Belgium?, Biot, Barcelona, Calabria, and Sicily ; 0-130 ft. I <dve 

 the Belgian localities for this and some other species with consider- 

 able hesitation, because I have not yet succeeded in having an 

 opportunity of critically examining and comparing the Belgian fossils 

 which bear the names of recent species. I have already ^shown (B 

 U. T. p. 175) that the Area pectunculoides of Nyst, from the "sable 

 noir of Antwerp, is very different from the recent species of that 

 name. 



13. Pecten striatum, Midler. 



P. striatus, Mull. Zool. Dan. Prodr. p. 248 : B. C. ii. p 60 ■ v 

 p. 168, pi. xxiii. f. 4. v ' ' ' 



' Porcupine ' Exp. 1869 : St. 6, 9, Galway B., 14, 45a, 45b, 70, 

 Little Minch, near Belfast, off Lerwick. ' ' 



