SYKRS : MOLLUSCA OF THE PORCUPINE EXPEDITION. -jO 



Bidrihution. — Finmark to the Mediterranean and Canary Islands. 

 Fossil in the European Tertiary. 



The Mediterranean specimens usually belong to the var. oblonga, Jeff. 

 Several other station numbers appear in the collection. 



CYLICHNA, Loven. 



Our knowledge of the various forms referred to this group is very 

 scanty. If Ciilichna be objected to on the ground of the prior Ci/ltchnus, 

 Burmeister, then Mneslia, A. Adams, may be used. 



In addition to the forms catalogued, there is a single worn dead 

 shell from Station 65, of the 1869 cruise, resembling a very large 

 C. Hoernesi, and not being so swollen as C. ovata. 



Cylichna alba (Brown). 



Volvaria alba, Brown : 111. Conch. Gt. Brit., 1827, pi. xxxviii, 



figs. 43, 44. 

 Cyliclma alba, Brown : Pilsbry, Man. Conch., vol. xv, p. 290 ; Friele 

 and Grieg, Norske Noi'dhavs-Exped., Mollusca, pt. iii, p. 108. 



"Porcupine Expedition," 1869, Stations 19« (live), 2Za, 31, 47, 

 61; 1870, Stations 9, 16, 17, 17«, 29. 



Distribution. — Circurapolar, down to the Azores, Pernambuco, and 

 California; for details see Friele & Grieg (I.e.). Recently recorded 

 from Spitzbergen (Knipowitsch). Fossil in Europe and North 

 America. 



The following notes are by Mr. J. T. Marshall : — 



" Gwyn Jeffreys (Ann. Nat. Hist., ser. iv, vol. xix, p. 333) cites this 

 species from the Porcupine Expedition of 1870 from the 'Bay of Biscay, 

 795-944 f.,' but there was no dredging at the first-named depth, and 

 the latter depth was off the coast of Portugal. Again, he writes 

 (Ann. Nat. Hist., ser. iv, vol. xx, p. 237) that in the Expedition of 

 1870 'a closely allied species, if more than a variety, came from 

 depths of 227 f. and 539 f in the Bay of Biscay.' The former depth, 

 however, occurred at Station 29, off Cadiz, and the latter was at 

 Station 9, on the slope of the English Channel. All through the 

 ' Valorous Report ' he has cited ' Bay of Biscay ' to many dredgings 

 that were obtained hundreds of miles away, as in the above instances. 

 As a matter of fact, the ' Porcupine ' did not dredge at all in the Bay 

 of Biscav. (See Carpenter & Jeffreys, Proc. Roy. Soc, vol. xix, 

 p. 154.)"" 



Cylichna cylindracea (Pennant). 



Bulla cylindracea, Pennant: Brit. Zool., vol. iv (1777), p. 47, pi. Ixx, 



fig. 85. 

 Cylichna cylindracea. Pennant : Pilsbry, Man. Conch., vol. xv, p. 289. 



"Porcupine" Expedition, 1869, Stations 67 (live), 68 (live), off 

 Lerwick, 10-66 fathoms; 1870, Stations 2, 3 (var. linearis), 4, 

 9 (live), 18 (live), 35, 50, 56 ; Vigo Bay; Benzert Road, 40-65 fathoms; 

 Adventure Bank, 92 fathoms. 



Distribution. — European seas from Norway to the Azores, Canaries, 

 and Madeira; Mediterranean; Whydah, W. Africa; St. Helena; 



