ANCHISTOMA. 205 



S. pellis-serpentis inhabits Guiana and Cayenne; 8. lira 

 siliana and 8. Moricandi, Brazil ; 8. serpens, Bolivia; and 

 8. heliacea is found in Corrientes. 



Species of Solaropsis. 



Brasiliana, Desk. pellis-serpentis, Chem. 



heliacea, D'Orb. serpens, Martyn. 



Moricandi, Beck. 



Genus ANCHISTOMA, Klein. 



Shell orhiculately depressed, the umbilicus open or 

 covered ; whorls 57, the last deflexed at the aperture, often 

 gibbous ; aperture contracted, lunate, sub -triangular ; peri- 

 stome reflexed, usually dentate; inner lip with a linguiform 

 or tooth-like callus, often uniting the margins. 



Syn. Stenotrema, Rqfin. Xylotrema, Rajin. Ulo- 

 stoma, Aiders. Triodopsis, Rajin. Dsedalochila, Beck. 

 Isognomostoma, Fitz. Plicostoma, Schli/f. 



Ex. S. thyroides, Sat/, pi. 78, fig. 3. Shell, S. con- 

 vexum, Rajinesque, fig. 3, a. 



The species of this group are principally American and 

 European, being found in the United States of North 

 America, Portugal, Greece, Carolina, Georgia, Alabama, 

 Florida, Pensylvania, and Indiana. The remarkable form, 

 Drejmnostoma of Porro, which comprises but a single known 

 species, is found in North Lombardy, where it lives under 

 stones and leaves. The species of Polygyratia are from the 

 forests of Brazil, and those of Con //a inhabit the East 

 Indies, Birmah, and Ceylon. 



VOL. II. ,, K 



