PULMONATA. 119 



Cyclostomidce, and the attenuation of the last whorl induces me to place it in the present 

 genus, apparently the only one in the family to which that character belongs. I refer 

 it, however, to Craspedopoma provisionally only, until, by the acquisition of more 

 perfect specimens, its true position may be ascertained. 



This elegant shell was discovered by Mr. D'Urban and myself, on a recent visit 

 to the Isle of Wight, accompanied by Miss D'Urban, to whom, in commemoration, I 

 have ventured to dedicate it. It is apparently very rare, and although we procured 

 several specimens, not one had the shell preserved. 



Size. — Axis, 4-20ths of an inch ; diameter, 3-20ths nearly. 



Locality. — Sconce. 



Helicina. — The shell described by Lamarck as Helicina dubia is found in the 

 High Cliff sands, and at Barton ; it is, however, a Botella, and will be described in its 

 proper place. 



In order that this account of our Eocene pulmonated molluscs may contain all 

 the species at present known, I subjoin the description of a shell acquired by me 

 since the early part of this monograph was printed, and which I have referred to 

 Bulimus, although the aperture is of a form unusual in that genus. 



No. 70. Bulimus heterostomus. F. E. Edwards. Tab. XIV, fig. 1 a — d. 



B. testa parvd, conicd; spird elevatd, acutiusculd, apice deciduo ; anfractibus septenzs 

 vel octonis, rotundatis, transversim regidariter lineatis; lineis tcnuissimis, numerosis, per- 

 obliquis: aperturd rotundo-ovatd, peristomate rejiexo. 



This shell has so much of the character and appearance of Truncatella, that I 

 should be inclined to refer it to that genus ; but it is found associated with land and 

 true fresh-water shells only, in a formation which does not present any trace of marine 

 origin. The nearly circular aperture resembles that of Cyclostoma; the transverse 

 lineation, however, is a character which, I believe, is not ever found in that genus. I 

 have referred it to Bulimus, but with some hesitation. It is a small conical shell, with 

 an elevated, tapering, pointed, spire, the apex of which is subject to decollation ; the 

 seven or eight whorls of which it is formed, are rounded, separated by a deep suture, 

 and ornamented with fine transverse raised lines, which are numerous, regular, and 

 very oblique ; the aperture is roundedly ovate, apparently thickened within, and with 



