584 DR. G"WYN JEFFREYS ON THE MOLLUSCA OF THE [June 17, 



Fossil. Miocene, Pliocene, and Post-tertiary. Everywhere through- 

 out Europe, Asia Minor, and Algeria ; 0-350 ft. 



Glycymeris argentea of Da Costa, Area margaritacea of Bruguiere, 

 and other useless synonyms. 



; 10. Nucula nitida, G. B. Sowerby. 



N. nitida, Sow. Conch. 111. {Nucula) p. 5, f. 20 : B. C. ii. p. 149 ; 

 v. p. 1 72, pi. xxix. f. 3, 3«. 



'Porcupine' Exp. 1869: St. 2, 9, 18, 19. 1870: Atl. 3, VigoB.; 

 Med. 50, 50a (var. veytrosa ; swollen and smooth), 51, 55, G. Bona, 

 Benzert Road, Tunis B., Adventure Bank. 



Distribution. Scandinavia to Smyrna ; 0-120 fms. 



Fossil. Pliocene and Post-tertiary. Coralline Crag, Paisley, Italy. 



Not N. nitida of Bronn, which is Area (Leda) nitida of Brocchi. 

 A streaked variety of the present species is analogous to the variety 

 radiata of N. nucleus. 



1. Pectunculus glycymeris, Linne. 



Area glycymeris, L. S. N. p. 1143. 



P. glycymeris, B. C. ii. p. 166, pi. iv. f . 4 ; v. p. 175, pi. xxx. 

 f. 2. 



'Lightning' Exp.: St. 5. 



'Porcupine' Exp. 1869: St. the Minch. 1870: Atl. Vigo B., 

 Setubal B., 26, 36. Tangier B. ; Med. Adventure Bank. 



Distribution. Finmark and the Faroe Islands to Mogador, through- 

 out the Mediterranean to Jaffa, Adriatic, Senegal, Madeira, Canaries, 

 N. Japan; 0-120 fms. 



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

 Belgium, S. France, Italy, Rhodes. 



It is difficult to verify the recorded localities for this species and 

 P. jrilosus, which have been evidently confounded by many authors. 



P. pilosus is a larger, thicker, and more orbicular or globose shell ; 

 the longitudinal stria? are more conspicuous and distinct ; the hinge- 

 area is wider, and the teeth are fewer and larger. The synonyms of 

 each are numerous, but have been intermixed. 



,/ 2. Pectunculus nummarius, Linne. 



Area nummaria, L. S. N. p. 1143. 



A. insubrica, Brocchi, Conch, foss. subapp. ii. p. 492, t. xi. f. 10. 



•Porcupine' Exp. 1870: Med. St. Algesiras B., 50, Adventure 

 Bank. 



Distribution. S.W. France, Mediterranean eastwards to the coast 

 of Egypt, Adriatic, Madeira and Canaries; 6-120 fms. 



Fossil. Pliocene. Coralline Crag, S. France, Italy, Morea, Rhodes, 

 and Cyprus. 



Although Linne's description was taken from a young specimen, 

 there can be no doubt as to the species, and his name ought to be 

 retained. It is the P. violacescens of Lamarck, and has many other 

 synonyms. Poli's figure (1 in plate xxvi.), without name or reference 



