PLATE LI. 



FIG. 11. 

 HELIX AURICULARIA. 



EAR, or TVIDE MOUTH RIVER SNAIL, 

 GENERIC CHARACTER. 



Aperture of the mouth lunated. 



**** Ovaied, imperforated, 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Without umbilicus : a narrow depression on the edge of the pillar 

 lip. Very ventricose, spire short and acute. Aperture very wide. 



Helix Auricularia : testa imperforata ovata obtusa, spira acuta 

 brevissima, apertura ampliata. Linn. Si/st. Nat. 

 p. 1250. No. 708. 



Cochlea testa diaphana anfracSIbus quatuor, mucrone acuto brevis- 

 simo, apertura acutissima. Litin. F. Siuc. I. 

 p. 376. N^o. 1315. //. No. 2192. 



Buccinum pellucidum subflavum, qua'uor spirarum, mucrone acu- 

 tissimo, testae apertura omnium maxima. List, 

 H. An. Angl, p. 139. tit. 23. tab. 2. Jig. 23, 



