236 UROCOPTIS, S. G. GONGYLOSTOMA. 



Group of U. torquata. 



Smooth or striate species with the axis straight, bearing a 

 single, thin, conspicuously serrate, sub-basal lamella. Re- 

 jected portion of spire very short, the apex smooth and rather 

 large. Last whorl adnate or very shortly free, usually en- 

 circled by a basal brown band ; the basal keel weak or obsolete. 



In addition to the following species, Cyl moreleti Pfr. may 

 belong here. 

 I. Peristome continuous, free or shortly adherent above. 



1. Shell corneous, slender, the diam. contained 4 to 7 

 times in the length. 



a. Base strongly carinate. U. acus, no. 121. 



a 1 . Basal keel weak or wanting. 



b. Rib-striate; length 17-22, diam. 3.7-4.7 



mm. U. thomsoni, no. 122. 



ft 1 . Wrinkle-striate ; 1. 21-23, diam. 4.2-4.8 



mm. U. colorata, no. 123. 



6 2 . Very weakly, coarsely striate; length 18- 



23, diam. 3.7-3.8 mm. U. adnata, no. 119. 



2. Shell whitish, stouter, the diam. contained 3y 2 to 4 

 times in the length; whorls S^-IO. 



a. Closely striate, the strias as wide as the inter- 

 vals; length 20-24, diam. 5.7-7 mm. 



U. arcustriata, no. 124. 



a 1 . Rib-strise more spaced, much narrower than 

 the intervals; length 21.5-26, diam. 5.4-6 mm. 



U. assimilis, no. 125. 



II. Peristome interrupted or distinctly adnate above; shell 

 smoothish, more or less crenulate below sutures, last 

 whorl striate. 



1. Dotted and streaked with corneous on a cream- 

 white ground ; very weakly striate. 



U. irrorata, no. 117. 



2. Pale fulvous, a little marbled with ashy- white; 

 obsoletely and remotely striate; base subangular; 

 length 24, diam. 4 mm. ; whorls 17. 



U. crenulata, no. 120. 



