Atharacophorus. \ 



GASTROPODA. 



791 



KEY TO SUBGENERA. 



A. Mantle-area not bounded by grooves on all sides. 



a. Tentacles long, cylindrical ; renal orifice inside the 

 mantle-area 



f>. Tentacles short, conical ; renal orifice separated by 

 a more or less distinct groove from the mantle- 

 area 



B. Mantle-area with enclosing grooves on all sides. 



a. Anal opening near perinotum 



b. Anal opening close to the outer angle or within the 



mantle-area 



ATHORACOPHORTJS. 



CONOPHORA. 

 PSEUDANEITEA. 



AMPHICONOPHORA . 



IX 



I. A. BITENTACULATUS. 

 II. A. BITENTACtTLATUS RUFO- 



VENOSFS. 

 III. A. MARMOREtTS. 



IV. A. DENDYI. 

 V. A. HTTTTONI. 



VI. A. MARTENSI. 



VII. A. PAPILLATUS. 



VIII. A. SCHATJINSLANPI. 



IX. A. SlMROTHI. 



X. A. GIGANTEUS. 



XI. A. VERRUCOSUS. 



