242 On some ncio and jyeeuUar Molhisca. 



of these strlai is more prominent than tlie three below it, so as 

 to give an angnhated appearance to tlie Avhorls ; the two sets 

 of strioj cross one another, the resuU bt'ing a faint eaneeUation; 

 top whorls smooth : colour whitish : spire slender ; apex 

 blunt: whorls 12-15, convex, gradually enlarging: suture 

 deep : mouth roundish-oval : outer lip thin : inner lijy folded 

 back a little at the base. L. 0'7. B. 0-125. 



Station 12, 1450 fms. ; two imperfect specimens. 'Porcu- 

 pine ' Expedition, 1870, off the coast of Portugal, 994 fms. ; 

 a single specimen. 



One of the ' Valorous ' specimens, Avhich is fragmentary, 

 measures 0*15 inch in breadth, and shows that the shell attains 

 greater dimensions than those given in the above description. 

 It is a very elegant species. 



Pyramidellidae. 

 Odostomia cdbula, Fabricius. 

 Turbo albuhis, Fabr. Fn, Gr. p. 394. 



Body milk-white, with a faint tinge of yellowish-brown : 

 head snout-like, cloven in front, with .smooth or ])lain edges ; 

 tentacles compressed, leaf-like or triangular, and folded inwards; 

 the edges are microscopically notched or saw-like, but not 

 ciliated : cT/es small, sessile on the inner bases of the tentacles : 

 foot rather short and thick, closely ciliated in front, with the 

 cilia in active and incessant motion, squarish and having 

 slightly angular corners, bluntly pointed behind : ojjerculum 

 ear-shaped, thin, paucispiral, marked with flexuous stria?, and 

 similar to that of other species of Odostomia. The animal is 

 very shy or sluggish. 



Holsteinborg, 10 fms. Greenland (Fabricius, Moller). 

 Spitzbcrgen Is-sound, 50 fms. (Torell) ! North Japan (St. 

 John) ; variety, anfractibus minus convexis ! Some of the 

 Japanese specimens have on the pillar a slight indication of 

 the usual fold or tooth. Hilr. A. Adams described this variety 

 as Menestho sulcatina. ^ 



The specific name is too much like albella ; but it may be 

 more inconvenient to change it. Otherwise I would have 

 proposed Fahricii. 



I cannot distinguish this species from Odostomia by any 

 generic character. The animal is similar ; and the shell has 

 the same heterostrophe and inverted apex. ]\Ioller says also 

 that it wants the lingual membrane or odontophore. He also 

 noticed the operculum, which Fabricius could not detect — 

 " operculum nullum." It is the type of Moller's genus 

 Menestho. Menke says, in his * Zeitschrift fur Malakozoolo- 



