52 DR. GWYN JEFFRKYS ON THE MOLLUSCA OF THE [JaU. 20, 



genera and species on a very extensive scale, he is of course at 

 perfect liberty to please himself; time, however, will show whether 

 other couchologists will adopt t'.iem. And I would also observe 

 that it is unusual, if not discourteous, to so positively aud ex cathedra 

 contradict other writers — who have the same means and ability as 

 himself for judging as to the authority of species previously published 

 - — without offering some reason for his dissent from their opinion. 



Genus Stilus \ Jeffreys. 



Shell spit-shaped, reticulated ; apex forming a twisted and 

 abruptly semidetached peak ; basal groove short and recurved. 



The peculiarity of this genus consists in the apex, which is 

 different from that of any other genus which I know. I consider 

 this character important. 



Stilus insignis', Jeffreys. (Plate VI. jSgs. 1-1 b.) 

 Shell obeliscoid, ratlier thick, opaque, but glossy : sculpture, 

 numerous and somewhat curved longitudinal ribs, of which there are 

 from 30 to 40 on the last whorl ; these are crossed by 3 spiral striae 

 on each whorl, so as to cause by their intersection minute tubercles 

 on the striae ; the periphery is encircled by a slight ridge ; the base 

 is quite smooth and somewhat concave ; the ribs on the apical or top 

 whorls are very few and flexuous : colour white : spire tapering, and 

 abruptly terminating in a short, twisted, and upturned point : whorls 

 10-12, flattened, and gradually enlarging; the last equals about one 

 third of the shell: suture narrow, but well defined: mouth zmnW, 

 squarish, with a short recurved groove turning to the left, as in 

 typical species of this family : outer lip thin, scalloped or indented 

 bv the spiral striae : inner lip inconspicuous : inlJar flexuous. L. 

 0-2.5, B. 0075. 



' Porcupine ' Exp. 18/0 : At). St. 29, 31-34. Several specimens. 



LyEOCocHLis GUANOSA, Searles Wood. 



C. granosum, S. Wood, Crag Moll. 1848, p. 73, pi. viii. f. 9. 



L. granosa, G. O. Sars, Moll. reg. arct. Norv. p. 190, t. 13. f. 6. 



'Lightning' Exp. St. 2. 



' Porcupine' Exp. 18G9: 23rt, 65, 89, 90. 



Distribution. Norway from Fiumark to Bergen, North Sea Exp. 

 {Metzger) ; 30-300 fm"s. 



Fossil. Pliocene : Red and Coralline Crags, Antwerp Crag (Brus- 

 sels Museum, as C. sinistratum of Nyst, although the species 

 described and figured by him is apparently different) ! 



Triforis macandrcecB of H. Adams, Triforis nivea of M. Sars's 

 MS., and Laococklis pomeraiiice of Dunker aud Meizger. 



The spire in this singular genus, which was established by Dunker 

 and Metzger, is reversed or siuistrorsal ; the basal groove is recurved 

 and twisted ; and the apex is sculptured, as in typical species of 



^ Having the shape of a Roman style or instrument for writing on waxen 

 tablets. 



* Remarkable. 



