Boone, Mollusca, Cruises of "Ara" and "Alva" 319 



for some time preserved in alcohol, which not improbably affected 

 the original colour of the lip. 



References: Concha margaritifera pleris, Lister, M., Hist. 



Conch., 1685, pi. 221, fig. 56. 

 Mytilus margaritiferus, Linne, C. von, Syst. Nat. ed. X, 1758, 



p. 209, p. 704. 

 Pinctada margaritifera, ROEDING, P. R., Mus. Boltenianum, 1798, 



p. 166. — Prashad. B., Siboga-Expeditie, Monogr. LIII-C, 



Livr. 118, 1932, Lamellibranchia : Pelecypoda (exclusive of 



Pectenidae), p. 98 (with excellent synonymy, 1685-1932). 

 Margaritifera margaritifera, Jameson, H. L., Proc. Zool. Soc, 



London, 1901, p. 373. 

 Pinctada galtsoffi, Bartsch, P., Proc. U. S. Nat. Mus., 1932 



(June), vol. LXXIX, art. 12, p. 12, pis. 1, 2. 



Family: PECTENIDAE 



Pecten (Belon, 1553), Lamarck, 1799 



Pecten jacobeus (Linne) 



■f 



Plates 129 and 130 



Type : Linne's type was obtained in the Mediterranean and is 

 deposited in the mollusk collection of the Museum Ludovicae 

 Ulricae. 



Distribution: This species is known throughout the Medi- 

 terranean basin, where it is very abundant. It is also known in 

 the fossil state from the Pliocene beds of Italy, Algeria and Greece 

 and from the Pleistocene of Sicily. 



Material examined : One very fine specimen, taken on mud 

 bottom, in 20 fathoms depth, 35 miles off Venice, Italy, August 10, 

 1933. 



Discussion : The classical description of this species, its vari- 

 eties, with exhaustive synonymy and discussion, clarifying the 

 tedious confusion existent between this species and Pecten maxi- 

 miis, Linne, presented by Messieurs E. Bucquoy, P. Dautzenberg 

 et H. Fischer (1889), is the standard reference for these species. 



