MOLLTTSCA OF INDIA. 



333 



Pfeiffer constituted three sectiona 



A. Ortliahjcanis. 



B. Charax, Bs. 



C. Dioryx, Bs. 



A was never described, but in that section the type of the geuus 

 All/cams, Gray, comes first. 



He divided A into four groups :— 



ffl, called " suhpyramidales" First species : gihhus, Per. (PI. 

 CLVI. figs. 5, 5 a ; Cochin China). _ -7 7 m 



h, called " glohoso vel ovato-conici." First species : ptlnla, (.tcI. 



c, " subtrocJiiformes." First species : vulccmi, Blf. 



d, ]', " conoideo-dejiressa." First species : andamanica, Bs. 



Von Mullendorff and Kobelt (1897) established four divisions— 

 the genus Dioryx with 13 species, aud three others. This is no 

 improvement on the classification previously put forward if we 

 take, for instance, Blanford's seven sections. » . tip -cc 



In a subgenus Orthalyccms (with 48 species) = bect. A of 1 leitter, 

 are to be found included species which Blauford placed m no fewer 

 than five sections, so widely do the shells vary. These are :— 



Sect. I. pyramid alls. Tenasserim. 



II. cons<ru'<«s (type), bembex, oii^/toras, and yraphicus. 



Sikhim and Arakan. 

 III. vulcani (" crenulated peristome"). Burma. 

 IV. vestiius. Arakan. 

 V. jacjori. Java ? 



In h, subgenus CJiamalycceus (with 46 species) similarly :— 



Sect. VI. andaynanice. Andaman Islands. 

 VII. nitidus. Arakan. 



In c, subgenus Charax (with 40 species) :— 



Sect. III. succineus. Arakan. 



IV a. cremdatus (type). Darjiling. 

 VI, armillatus. Pegu. 

 Vila. avce. Burma. 

 \llb. hebes. Khasi. 



In Charax greater variation in the species may be noted than in 



the previous division. , n l ■ i l m 



Diorvx of Benson holds its own, and at first sight Charax 

 appears to form a good section in which several species can be 

 placed without misgiving ; but we soon have to deal with species 

 in which the constriction departs greatly from that of typical 

 hebes and further subdivision has to be considered, lake, tor 



