XV 



Buddii, Say.* proxima, Say. 



circincta, Lea. ScJiiedeana, Phil. 



exilis, Halcl. . silicula, Gld. 



muUih'neata, Say. striata. Lea. 



obruta, Lea. Troostiana, Lea. 



occata, Hinds. Vlrginica, Say. 

 proteus, Lea. 



" Genus Gyrotoma, Shuttleworth (i, 305.) 



Shell ovate, turreted ; whorls transversely sulcate ; aperture 

 oblong ; inner lip thickened, with a posterior callositj^ ; outer 

 lip thin, with a deep, narrow, posterior fissure. 



Syn. Schizostoma, Lea, not Broun, 3Ielatoma, Anthony, not 

 Swainson, Schizochenus, Lea. 



Ex. G. ovoidea, Shuttleworth, t. 32, f. 4, a, b. 



The fissure in the outer lip is wanting or obsolete in the sub- 

 genus 3Iegara, the species of which in other respects closely 

 resemble those of Gyrotoma proper. Both groups are American 

 in their geographical distribution. 



alt ill's, Anthony. excisa, Lea. 



Babylo n ica , Lea. Forem a n i, Lea. 



Buddii, Lea, funicidata, Lea. 



conica, Say. incisa. Lea. 



constricta, Lea. laciniata, Lea. 



ciirta, Migh. ? ovoidea, Shuttl. 



ciirvata, Say. pagoda, Lea. 



cylindracea, Migh.? x)yramidata, Shuttl.f 



" Subgenus Megara, H. & A. Adams (i, p. 30G.) 



Shell ovate, solid ; whorls transversely sulcate ; aperture 

 ovate-oblong, subcanaliculated anteriorly ; outer lip thin, sim- 

 ple, acute. 



alveare, Conr. Hoeydei, Lea. 



arctata, Lea. impre.'i.<ia, Lea. 



auricidcpformis, Lea. lateralis. Lea. 



hasalis, Lea. lima, Conr. 



hrevis, Lea. oliva. Lea. 



crebristriata, Lea. olivvla, Conr. 



harpa. Lea. oralis. Lea. 



Haysiana, Lea. pumila, Lea. 



* Should read Buddii, Lea. M. fxilifi, Ilald., and pmxima. Say, 

 certainly do not belong here. I have already remarked upon 31. Vir- 

 yinicn and mnltiUnenta. 



tMr. Anthony never described Gyrntoma altUi^, ranked among 

 these species. G. conica. Saj', is the young of Plcnrocera canaliculata. 

 There are, besides, frequent mistakes iu all these lists, in misquoting 

 authorities. — T. 



