CANARY ISLAND FERUSSACLE. 237 



slightly longer, posteriorly a little less obtusely rounded, or 

 more angular." Lofty sea-cliff known as the "Risco," over- 

 looking the Salinas, in the extreme north of Lanzarote. 



My figures are drawn from a specimen from the Wollaston 

 collection, measuring, length 10, diam. 3.1, length of aperture 

 3.9 mm., whorls 



20. F. ATTENUATA (Mousson-). PI. 40, fig. 42. 



Shell imperforate, subfusiform, smooth, very glossy, trans- 

 lucent, pale corneous. Spire concavely tapering, the apex 

 rather acute, nucleus subpapillar, hyaline; suture linear, 

 somewhat impressed, narrowly flatly margined, whorls 7, a 

 little convex, the 5 upper ones subregular, the sixth slowly 

 descending and subelongate, last whorl shorter, regular, more 

 convex at base, subdepressed. Aperture subvertieal (10 de- 

 grees with the axis), small, inversely piriform, angular above, 

 arcuate below. Peristome unexpanded, very strongly thick- 

 ened and labiate; margins joined by a callous layer, colu- 

 mellar margin narrowly reflexed and adnate. Columella nar- 

 rowly excavated, rather straightened, tapering downward 

 with no well marked prominence. Length 9, diam. 2.5 mm. 

 (Mouss.) . 



Canary Is. : northern coast of Lanzarote, on the cliff 

 "Risco." 



Cionella attenuata Mouss., Rev. fauna Malac. Canaries, p. 

 134, pi. 6, f. 32, 33 (1875). PFR., Novit. Conch, vi, p. Ill, 

 pi. 125, f. 32, 33.Ferussacia a., PFR., Monogr. viii, p. 306. 

 MABILLE, Nouv. Arehiv du Museum (2 ser.), viii, p. 154. 

 Lovea a., WOLLASTON, Test. Atlant. p. 461. 



"Although relatively a little narrower and more tapering 

 in outline, with usually an extra volution, and with the ulti- 

 mate and penultimate ones rather less elongated (in propor- 

 tion to the size of the shell) , I am nevertheless far from cer- 

 tain that the present Loved is truly distinct specifically from 

 what I have regarded as the 'var. B. tumidula' of the lan- 

 zarotensis; and this is all the more possible, because I un- 

 doubtedly possess many examples which are more or less in- 

 termediate between the latter and the attenu&ta, and because 



