CYLICHNA. 291 



XX, p. 139, 237 ; P. Z. S. 1883, p. 393.— Sars, Moll. Arct. Norv., p. 

 283, pi. 17, f. 15, 16.— A. Ad., Thes. Conch, ii, p. 591, pi. 125, f. 

 137.— Gould, Inv. Mass. (edit. W. G. B.), p. 220, f. 98.~Leche, 

 K. Svensk. Vet.-Akad. 1878, p. 72. — AVatson, Chall. Rep. Gastr., 

 p. 661. — AuRiviLLius, Vega Exped. iv, p. 369. — Bulla triticea 

 Couth., Bost. Journ. N. H. ii, p. 88, pi. 2, f. 8. — CyUchna elongata 

 LocARD, Coq. Mar. Cotes France, p. 25, 1892. 



Shorter and less cylindrical than C. cylindracea, and with far less 

 obvious spiral striation than C. occulta. 



Var. coRTicATA (Beck) Moller. PI. 60, figs. 14, 15. 



Shell with a thick, dark brownish epidermis; somewhat narrower 

 than the typical alba, cylindrical; vertex broadly truncated; col- 

 umella indistinctly folded. Alt. 8 mill. 



Norrvay ; Greenland. 



Bulla corticata (Beck) Moller, Ind. Moll.Groenl.Naturh.Tids- 

 krift, p. 79, 1842. — CyUchna alba var. corticata Sars, Moll. Arct. 

 Norv. p. 283, pi. 17, f 16.— Aurivillius, Vega Exped. iv, p. 370. 

 ~B. (Ctjlichna) corticata Ad., Thes. ii, p. 592, pi. 125, f 138.— 

 Bulla nucleola Reeve, in The Last of the Arctic Voyages (Belch- 

 er's) ii, p. 393, pi. 32, f 2, 1855. 



C. CHEVREuxi Dautzenberg. PI. 29, figs. 1, 2, 3. 



Shell 6 mill, high, 2*7 mill, wide ; solid, rather shining, cylindrical 

 truncated above and below. Whorls 3, convoluted, the first 

 immersed, the last smooth but with arcuate, obsolete growth-strise. 

 Aperture narrow, at base dilated. Columella very oblique, 

 calloused, very shining. Lip acute, arcuate above, then straight- 

 ened. Color white. (Dautz.). 



Pico, Azores, 1287 meters. 



C. chevreuxi Dautz., Res. Camp. Sci. Albert I, p. 23, pi. 1, f. 6. 



Differs from C. alba in the wider, thicker columella, and more 

 eflfuse base of the aperture. 



C. GRiMALDii Dautzenberg. PI. 27, figs. 99, 100. 



Shell 9 mill, high, 5 broad, rather solid, convoluted, subcylin- 

 drical, the base rounded. Apex obtusely truncated, imperforate, 

 depressed in the middle. Last whorl with arcuate growth-lines and 

 regularly ornamented with numerous impressed distinct spiral striae. 



