100* 



teriorly close to the last volution ; peritreme thiu, anteriorly very 

 slightly reflected ; umbilicus very large, showing internally the 

 four volutions. 



The shell is somewhat diaphanous, so that the white and dark- 

 brown zones are distinctly seen witliin the aperture. 



Columbia. Mus. Cuming. 



182. Cyclostoma TEXTURATUM (Tab. Suppl. xxxi. ^,, f. 303), 

 nobis. 



C. testa depresso-suborbiculari, albida, epidermide crassiuscula 

 olivaceo-brunnea induta ; spirfi brevissima, obtusa, anfractibus 

 ((uinque, rotundatis, irregulariter rugulosis seu sulcis irregularibus 

 undulatis circumdatis ; sutura distincta ; apertura fere circulari, 

 postice prope anfractum ultimum subangulari, intiis albicante; 

 peritremate tenui ; umbilico maximo. 



Shell suborbicular, depressed, whitish, coated with a thickish 

 olive-brown epidermis ; spire very short, obtuse ; volutions five, 

 rounded, entirely covered with irregular undulated grooves, giving 

 it somewhat the appearance of being woven ; suture distinct ; 

 aperture nearly circular, slightly angular posteriorly close to the 

 last volution, whitish within ; peritreme tliin ; umbilicus very 

 large. 



From the Province of Guatemala, Central America. Cuming. 



183. Cyclostoma incomptum (Tab. Suppl. xxxi. a, f. 298, 

 299), noUs. 



C. testa depresso-suborbiculari, alba, epidermide olivaceo-brun- 

 nea induta ; spira brevi, obtusa ; anfractibus 4^, rotundatis, 

 oblique lineis incrementi validis striatis ; sutura distincta ; aper- 

 tura fere circulari, postice prope ultimum anfractum sinuata, exti^is 

 tuberculam fornicatam formante; peritremate antice incrassata; 

 umbilico magno. 



Shell suborbicular, depressed, white, covered with an olive- 

 brown epidermis ; spire short, obtuse ; volutions 4^, rounded, 

 obhquely striated by the strongly marked lines of gTowth ; suture 

 distinct ; aperture nearly chcidar, with a sinus posteriorly close 

 to the last volution, forming a vaulted tubercle externally ; peri- 

 treme thin, a little thickened in front ; umbilicus very large. 



This is one of the genus Pterocyclos, of Benson ; we do not 

 know its locality, but suppose it to be Indian. It is in Mr. 

 Cuming's Collection. 



