158 Notes on certain Terrestrial Mollusca. 



convexinsculi, ad suturam leviter impressam breviter striato-marginatse, 

 ultimus latior, non descendens ; apertura fere verticalis, lunato-rotun- 

 data; perist. simplex, acutnm, margine columellari vix reflexiusculo. 



Shell perforate, depressed, thin, minutely striatulate, shining, 

 diaphanous, horny-amber ; spire nearly level ; whorls 4, rapidly 

 increasing, scarcely convex, with shortly striated margin at the 

 lightly impressed suture, the last wider, not descending ; aper- 

 ture almost vertical, lunate-rounded ; peristome simple, acute, 

 the columellar margin scarcely reflexed. 



Diam. maj. 8 ; min. 7 ; alt. 3 mill. 



Habitat. — Porto Cabello, Yenezuela. Eobert Swift. 



Remarks. — I received one specimen of this interesting spe- 

 cies, with the animal, from Mr. Robert Swift, and submitted it 

 to Edward S. Morse for microscopic examination, and to him I 

 am indebted for the accompanying figures and the substance of 

 the subjoined notes. 



Fig. 8. 



Fig. a. Shell with animal, about the natural size. 



b. Head magnified; superior tentacles partially retracted. 

 Morse mentions that he could find no trace of the 



