xu 



Messrs. H. & A. Adams (Genera of Recent Mol- 

 lusca) propose the following classification : * — 



" Ceriphasia, Swainson (i, p. 297.) 



Shell subfusiform, whorls transverse!}^ sulcate, the last angu- 

 latecl ; spire acuminated ; aperture small, produced in front, 

 with a small groove-like canal at the fore part ; outer lip thin, 

 posteriorly sinuated. 



Syn. Telescopella^ Gray. 



Ex, C cancdiculata, Sa}^, t. 31, f. G. 



The shell of Ceriplicma is covered with a dark-green epider- 

 mis, and is more like that of lo than any other of this family ; 

 it may, however, be distinguished from lo by the beak being 

 shorter, and by the whorls being sulcated and not spiny." 



acuta, Lea. luteosa, Gould. 



Alexandrensis, Lea. Ordiana, Lea. 



annulifera, Conr. regnlaris, Lea. 



canaliculata, Say. S2')urca, Lea. 



elongata, Lea. subularis, Lea. 



exarata, Lea. sidcosa, Lea. 



Haleiana, Lea. symmetrica, Hald. 



Kirtlandiana, Lea. Vainafa, Gould. 



liigubris, Lea. Virginiea, GmeLf 



" Genus PAcnrcnEiLus, Lea (i, 298.) 



Operculum suborbicular, of several whorls. Shell subfusi- 

 formly conical, smooth, solid ; aperture ovate, entire anteriorly ; 

 columellar lip thickened posteriorly ; outer lip thick. 



The chief peculiarity of this genus is the thickened outer lip ; 

 it differs from Melanopsis in having no sinus at the fore part of 

 the aperture, and from Melania in having a callous columella. 



* We quote the full lists of species given by Messrs. Adams, in order 

 that the insufficiency of their genera may become more apparent from 

 the incongruous assemblage of shells of which they have composed 

 them. Prof. Ilaldeman writes (Proceed. Acad. Nat. Sciences, p. 274, 

 Sept. 18G3) : "The groups of Messi's. H. & A. Adams often indicate 

 merely sections ; and sectional names given as generic are scientifi- 

 cally erroneous, because they erect certain species into genera and 

 subgenera only when they belong to extensive groups, requiring 

 numerous specific names, whilst the same amount of character goes 

 for nothing in groups which have but few species." 



t The species here assembled are principally Goniohases, but are 

 included in Ceriphasia evidently because they are " transversely sul- 

 cate." M. Virginica and its synonynie muUiUneata are again introduced 

 in Jitga, a subgenus of Vihex, Oken ! 



3/. canalirulata, Say, is introduced, but undulata. Say, does not 

 appear, while filum. Lea, a very closely allied species, is placed in 

 Elimia, a subgenus of lo. 



