DESCRIPTION. 183 



PLATE XXVI. 



Fig. 1. Helix acutangula. 



Shell imperforate, thin, pellucid, acutely cari- 

 nate ; spire slightly convex ; aperture ovato-lan- 

 ceolate. 



Nondescript, 



Specimen pale horn-colour, finely striate lon- 

 gitudinally, whorls three,, nearly flat at top ; ex- 

 tremely brittle. 



Habitat unknown. 



This and the following shell, as well as the three 

 figured in Plate XXVII. and the last in Plate 

 XXVIII. are all in the possession of Mrs. Mawe. 

 They are certainly rare, and some of them are sup- 

 posed unique : if either of them have been previ- 

 ously named or figured by any other writer, it is 

 not within the knowledge of the author, who is far 

 from wishing to lay claim to originality not his own, 

 or to impose his names in preference to such as 

 have been already conferred. In selecting the 

 names he has endeavoured to find those which 

 shall express some remarkable character of the spe- 

 cies, and which may in some degree distinguish 



