174 HELIX-HELICELLA. 



aperture little oblique, subrotund ; margins converging ; peristome 

 acute, straight ; columellar margin reflected, partly covering the 

 perforation. (Paul.} 



Alt. 10, greater diam. 11, lesser 10i mill. 



Sassari, Sardinia. 



H. dohrni PAUL., Bull. Soc. Mai. Ital. 1882, p. 252, t. 7, f. 3. 

 HELIX (HELIOMANES) RICHARDI Ponsonby mss., Kobelt, Nachr.- 



BL D. M. Ges. 1889, p. 141. Black Cape, Africa. 



Near to H. dautezi Kob., but more solid and rudely costulate. 



H. CARUAN.E Kobelt. PI. 27, figs. 82, 83, 84. 



Shell moderately and rather openly umbilicate, subglobose, or 

 depressed-globose, thin but rather solid ; little shining ; irregularly 

 ribbed-striate, the striae close, under the lens seen to be often trans- 

 versely interrupted ; visible within the umbilicus. Buff-whitish or 

 gray, having a whitish peripheral band, with an interrupted wide 

 chestnut band above it ; the rest of the upper surface is variously 

 marked with red-brown flecks, streaks and narrow interrupted 

 bands ; whorls 6, rather rapidly and irregularly increasing, separated 

 by a suture at first linear, becoming irregularly impressed ; apical 

 whorl small, smooth, horn-colored, hardly convex, the following 

 whorl slightly convex, the last whorl subinflated, dilated, rounded, 

 deeply descending in front, then deflected. Aperture oblique, ovate- 

 rounded, broadly lunate ; peristome thin, acute, narrowly but dis- 

 tinctly lipped within, the lip buff; margins slightly converging but 

 scarcely joined ; upper margin straight, flattened, columellar margin 

 brownish, dilated reflected over the umbilicus. (Kob.*) 



Alt. 14-15, greater diam. 21, lesser 18 mill. 



Malta. 



H. caruance KOB., Nachr. D. M. Ges. xx, 1888, p. 119; Rossm. 

 Icon. n. f. iv, p. 84, f. 672, 673. H. gattoi KOB., 1. c., p. 86, f. 676. 



This form has hitherto been referred to variabilis or cespitum, but 

 is apparently distinct, being probably more nearly allied to the 

 group of H. mauritaniea Bgt. In the series before me, received 

 from A. Caruana Gatto, I am quite unable to see how two species 

 are to be distinguished, although examples may be selected agreeing 

 perfectly with Kobelt's figures of each. With all deference to the 

 opinion of Kobelt, whose knowledge of Xerophila vastly surpasses my 

 own, I am compelled by the series I have studied to rank H. gattoi 

 as a variety or form. 



