]68 LIMNiEAD^. 



(as in auricularius) in proportion to the breadth of the 

 body, and its area, on the average, is not more than quad- 

 ruple that of the portion above it ; the not pecuHarly narrow 

 antepenult is bluntly trigonal and planulately shelving as 

 in auricularius, but much broader than high. Body only 

 moderately ventricose, its basal declination more or less 

 rounded, its anterior extremity not peeuliai'ly i^rominent. 

 Mouth usually filling from four-sevenths to five-sixths of the 

 length, and on the average four-sevenths only of the ventral 

 area, of a broader or narrower peaked ovate figure, well 

 rounded below. 



Outer lip not peculiarly projecting, bending downwards 

 at once, only moderately arcuated throughout, for the most 

 part not expanded ; its anterior recedence but trifling. 

 Pillar lip much elongated, arched to the right below, in 

 general rather broadly reflected but not appressed, except 

 occasionally above, disclosing a more or less open chink; 

 its left edge not incurved ; columellar twist very rarely 

 developed. 



Variety ovata. Ventricose, often more transparent and 

 yellow than in the preceding form ; spire very small and 

 little elevated, sometimes not filling an eighth of the dorsal 

 length, its whorls of quick increase and peculiarly short ; 

 mouth capacious, occupying about two-thirds or even more 

 of the ventral area, and about five-sixths of the total 

 length ; pillar lip somewhat flatly reflected over the upper 

 part of the chink (fig. S). 



Variety lineata. Body more or less swollen, large ; spire 

 short, its upper turns often eroded, and small in proportion to 

 the penult. Throat with somewhat divergently transverse 

 linear indentations, which cause corresponding external 

 elevations. The spire in sinistral examples (fig. 7) thus 

 sculptured is usually more produced and regular, and the 



