OF OONCHOLOQY. 103 



Glotella, Gray. 



3Ielania armigera, Say. 



Messrs. H. & A. Adams (Genera of Recent Mollusca) pro- 

 pose the following classification : — * 



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



Shell subfusiforra, whorls transversely sulcate, the last an- 

 gulated ; 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. G. cmmlicnlata, Sa}^, t. 31, f. G. 



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

 mis, and is more like that of io 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." 

 ac2(ta, Lea. luteosa, Gould. 



Alexandrensis, Lea. Ordiana^ Lea. 



annulifera, Conr. regularis, Lea. 



canaliculata, Say. spurca, Lea. 



elongata, Lea. subularis, Lea. 



exarata, Lea. sulcosa, Lea. 



JIaleiana, Lea. symmetrica, Ilald. 



Kirtlayidiana, Lea. Vainafa, Gould. 



lugubris, Lea. Virginica, Gmel.f 



"Genus Pachycheilus, 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 



* 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 in- 

 congruous assemblage of shells of which they have composed them. Prof. 

 Haldeman writes (Proceed. Acad. Nat. Sciences, p. 274, Sept., 1863,) 

 " The groups of Messrs. H. & A. Adams often indicate merely sections ; 

 and sectional names given as generic are scientifically erroneous, because 

 they erect certain species into genera and subgenera only when they be- 

 long 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 Goniobases, but are included 

 in CeripJiasia evidently because they are "transversely sulcate." M. Vir- 

 ffini'ca and its synonym muUiliiieata are again introduced in Juga, a sub- 

 genus of Vibex, Oken ! 



M. canaliculata, Say, is introduced, but undulata. Say, does not appear, 

 while Jilum, Lea, a very closely allied species, is placed in Elimia, a sub- 

 genus of lo. 



