PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 381 



alhula of Greenland, wliich, according to Jeffreys, is (listiTU't from our 

 sliell, so named by Gould. These three forms all belong to Menestho 

 M oiler {— Liostomia G. O. Sars). 



Aiiriculina insculpta ? (Mont.)- 



(1. O. Sars, op. cit., p. 204, pi. 11, figs. 11, 12; pi. xviii, fig. 38 (operculum). 



A single dead and probably immature specimen, which I refer doubt- 

 fully to this species, was taken at station 892, in 487 fathoms, ft agrees 

 nearly, in form and sculi)tnre, with the figure (12) given by Sars, but our 

 shell is shorter, ovate-fusiform. There are five slightly convex whorls; 

 the anterior half of the body-whorl is covered with distinct, fine, spiral 

 grooves ; nuclear whorl rounded, rather large, partially incurved. Aper- 

 ture narrow-ovate; a slight fold on the columella; no umbilicus. 



Diaphana Brown, 1827 (restricted) ; H. & A. Adams. 



Utricuhis (pars) Brown, 111. Brit. Conch., 1844 {non Scliumacher, 1817). 

 Utriculus G. O. Sars, Moll. Reg. Arct. Norv., p. 28.'>. 



• In 1827 Brown proposed the name Diaphana for certaiji species of 

 shells figured by him (but not described), which n*ow are known to belong 

 jiartly to the restricted modern genus Utriculus and partly to Amphi- 

 sphyra Loveu, 184G. But he did not then define the genus, and in a later 

 edition of his work (1844) he discarded the name and substituted Utri- 

 culus for it.* But Utriculus had been used by Schumacher, in 1817, for a 

 ditfereut genus (Conidw). Loven's name {Amphispkyra)^ established by 

 him for Brown's second section of Utriculus, should, therefore, be re- 

 tained for that group, which is a good genus. Diaphana and Utriculus, 

 as used by Brown, were absolutely synonymous, but Diaphana, as used 

 by G. O. Sars, is a synonym of Amphisphyra. In its original sense, Dia- 

 phana might be rejected, because uudefiued. But siuce Utriculus had 

 been preoccupied, it seems necessary to retain Diaphana for the first 

 section of Brown's genus, corresponding nearly with Utriculus of G. O. 

 Sars. This is also in accordance with the nomenclature in H. & A. 

 Adams's Genera of Shells. 



The absence of an odontophore in Diaphana H. & A. Adams = Utri- 

 culus Sars, is certainly a very important character by which the genus 

 can easily be distinguished from Cylichna and Amphisphyra. But this 

 genus cannot always be distinguished from Cylichna by the shell alone. 

 On that account Loven, Jefl'reys, and other able conch ologists have re- 

 ferred some of the si)ecies of '•'•Utriculus'''' to Cylichna. 



Diaphana uitidula (Lovdn) Verrill. 



Ci/liclttia uitidula L()v<:in, op. cit., p. 142, 1846. 



Utricahti) iiilidiilitii G. O. Sars, op. cit., p. 236, pi. 17, fig. i:^; pi. 26. fig. o; pi. 

 xi, figs. Gfl, 6 6 (gizzard, «fec.). 



This sheU has been dredged by us in several localities in deep water 

 off" the coast of New England and Xova Scotia, and by Mr. Whiteaves 

 in the Gulf of Saint Lawrence. This season it was taken at stations 

 891, 892, and 894, in 305 to 500 fathoms. 



* This change was probably first made in the edition of 1834, which I am unable to 

 consult. 



