LIMNiEA. 



59 



L,iiunaea Iiolliollii, Beck & Moll. (Index Moll. Gr. 5 (1842).— 

 MoKCH, Moll. Gr. 76. 



Fig. 91. 

 I can find no description of this species. Fig. 91 is 



drawn from a specimen in the collection received from 

 Moller. 



Since writing the above I have met with a figure of 

 the species in Kiister, Chemn. ed. 2, 28, pi. v, f. 13-15, 

 and the following description : — 



Shell broadly rimate, ovate conic, rather thin, shining, horn-colored, 

 striate ; spire conical, truncated, suture rather profound, whirls convex ; 

 aperture ovate, shorter than one-half of the shell's length ; peristonae 

 straight, its columellar termination white, with an obsolete fold. Height 

 5-6'"; breadth 2^3'". {Kiister.) 



Fig. 92. 



LrimnaDa adelinse, Tryon. — Shell thin, semi-transparent, body 

 whirl large, wide, convex ; spire small, consisting of five convex volu- 

 tions, attenuating rapidly to an acute apex, sutures impressed ; 

 inner lip thin, reflected, but not covering the umbilical fissure, 

 which is narrow ; columella twisted ; color light horn, polished 

 within the aperture, outer lip tinged with red within. Length 

 14, greater diameter 8^ ; of aperture, length 9, breadth 5 mill. 



San Francisco, California : Rev. J. Rowell. My cabinet and 

 cabinet of Mr. Rowell. 



This shell is nearly allied to L. catascopium, Say, and perhaps 

 more nearly to L. intermedia, Mich., of Europe. From the former 

 it may be distinguished by being more fragile, more transverse, with a 

 smaller, more rapidly attenuating spire, but principally by the presence 

 of an umbilical fissure, which in catascopium is entirely concealed by the 

 appression of the labium. In this and other respects it is very near to 

 L. intermedia, which, however, has a shorter spire, of fewer volutions. I 

 name this species after my sister. Miss Adeline S. Tryon, who has evinced 

 much interest in conchological pursuits. (Tryon.) 



Limnaea adelinas, Tryon, Proc. Phila. A. N. S. 1863, 149, pi. i, f. 12. 

 The original description and figure are copied above. 



