1884.] MOLLUSCA OF THE 'LIGUTNING' ETC. EXPEDITIONS. 1 11 



4. On the Mollusca procured during the ' Lightning ' and 

 'Porcupine 'Expeditions, 1868-70. (Part VII. 1 ) By 

 J. Gwyn Jeffreys, LL.D., F.R.S., F.Z.S. 



[Received February 19, 1884.] 



(Plates IX. & X.) 



GASTROPODA ; Family Littorinid.« (continued). 



Rissoa. 



A. Alvania. Cancellated ; outer lip usually strengthened by a rib, 

 and sometimes notched within. 



1. Rissoa cancellata, Da Costa. 



Turbo cancellatus, Da Costa, Br. Conch, p. 104, pi. viii. f. 6, 9. 



E. cancellata, B. C. iv. p. 8; v. p. 207, pi. lxvi. f. 3. 



♦ Porcupine' Exp. 18/0 : Atl. St. Vigo B., 36, Tangier B. ; Med. 

 Adventure Bank. 



Distribution. Upper Norway (McAndrew) ! Stornoway to the 

 Channel Isles, Atlantic coasts of France and Spain, Mediterranean, 

 Adriatic, Mogador, Madeira, and Canaries ; 0-112 fms. 



Fossil. Miocene : Modena, N.W. Germany, Bordeaux Basin, 

 Madeira. Pliocene : Italy. Post-tertiary : Scotland, Ireland, and 

 Selsea. 



Turbo cimex of Donovan and older British authors (not of Linne), 

 E. crenulata of Michaud, and other obsolete synonyms. Not E. 

 cancellata of Desmarest, which is E. cimex. 



2. Rissoa calathus, Forbes and Hanley. 



E. calathus, F. & H. British Mollusca, iii. p. 82, pi. Ixxviii. 

 f. 3 : B. C. iv. p. 1 1 ; v. p. 207, pi. lxvi. f. 4. 



'Porcupine' Exp. 1870: Atl. St. 16, Tangier B. ; Med. Rasel 

 Amoush. 



Distribution. Drontheim and Bergen, Hebrides, Ireland and Isle 

 of Man, Atlantic coasts of France and Spain, Mediterranean, Adriatic, 

 Canaries (var. manzoni) ; 5-200 fms. 



Fossil. Pliocene : Coralline Crag, Italy, Rhodes. 



Allied to Turbo acinus of Brocchi and E. venus of d'Orbigny, 

 both of which are Miocene species. 



Young or immature specimens of the present species agree in every 

 particular with Philippi's description and figure of his E. reticulata ; 

 but that name had been preengaged by Montagu for the next species. 

 It is somewhat variable in size and sculpture. 



1 For Part I. see P. Z. S. 1878, p. 393 ; for Part II. see P. Z. S. 1879, p. 553 ; 

 for Part III. see P. Z. S. 1881, p. 693 ; for Part IV. see P. Z. S. 1881, p. 922 ; 

 for Part V. see P. Z. S. 1882, p. 656 ; and for Part VI. see P. Z. S. 1883, p. 87. 



