— 349 - 



finely striated and polished below. Spire low, apex pro- 

 rainent, suture impressed. Whorls6-61/2, convex, increas- 

 ing slowly and regularJy, the last subangulated above tbe 

 peripbery, somewhat coinpressed below, obtusely angu- 

 lated round the wide open umbilicus, slightly dilated near 

 the raouth, scarcely descending in front. Aperture sub- 

 auriculate, oblique, niargins distant ; peristome whitish 

 or livid, thickened, slighty expanded and strongly reflex- 

 ed, the margins united by a raised flexuous callus which 

 bears a short, obliquely ascending entering fold ; upper 

 margin at first strongly arcuate, then slighty inflexed and 

 projecting forward, outer and basai curved, coluraellar 

 straight, ils terrnination slighty contracted. 

 Pariétal armature (fîg. 2') composed of two vertical 



Fig. 2» 



Fig. 2b 



plates, the anterior the shorter of the two, flexuous, with 

 a short slender horizontal fold anteriorly above; the junc- 

 tion slightly notched, its lower extremity giving ofï 

 anteriorly a short stout support, and a free horizontal 

 lamella, its anterior extremity even with the anterior 

 plate, its posterior extremity reaching close to the lower 

 extremity of the posterior plate, which is curved, obli- 

 quely descending backwards with a short support post- 

 eriorly at its upper extremity. 



Palatal armature (fig. 2^), composed of five folds obli- 

 quely ascending forwards : the first smallest, near the 

 suture, nearly horizontal, both extremities attenuated and 

 elongated ; the next three semicircular, about equal and 

 more oblique than the first, each with a slight denticle 



