62 RISSOID^J. 



Genus PACHYDROBIA, Grosse and Fischer. 



J. de C. XXIV, 1876, type P. paradoxa, Cr. and F.; genus of Fam. 

 Rissoidce, fide Martens; fide Poirier, J. de C. 1881, belongs to the Hydro- 

 bince, next allied to Ottilia. 



1. Pachydrobia parva. 



Pachychilus parvus, Lea, P. Ac. Nat. Sci. Philad. I III, 1856, Siam ; = 

 Melania crassilabrum, Reeve, Icon. 1860 ; = Paludomus cyanostomus, 

 Morelet, J. de C. 1864, Siam. 



4 Cambodia; ex c. A. Morelet, Esq. 



2. Pachydrobia paradoxa. 



Pachydrobia paradoxa, Crosse and Fischer, J. de C., 1876, Cambodia. 



1 Locality ? ; ex " Linnsea." 



Genus HEMISTOMIA, Crosse. 

 J. de C. 1872, type Hemistomia caledonica, Crosse. 



1. Hemistomia caledonica. 



Hemistomia Caledonica, Crosse, J. de C. 1872, near Noumea, long. 2\, diam. 

 f mil. 



2 New Caledonia ; ex c, P. Bouvier, Esq. 



Genus TRJCULA, Benson. 



Calciitta J. Nat. Hist. 1842, type T. montana, Benson ; fide Stimpson, 

 StoliczTca and Stanford, belongs to Fam. Rissoidce. 



1. Tricula montana. 



Tricula montana, Benson, Calc. J. Nat. Hist. 1842, and Ann. Mag. 1862, 

 Bhimthal, at 4,000 ft., Kumaon ; Con. Indica, pi. 155, fig. 1. 



10 Nynee Thai ; coll. Dr. F. Stoliczka. 

 7 Bhinathal [? typical] ; ex c. Asiatic Society, Bengal. 



var. CUrta, nov. 



2 Jliiri Valley, at 3,000 feet [N. Cachar] ; coU. Colonel H. H. Godwin- 

 Austen. 



Genus BAIKALIA, von Martens [emend.~\. 



Jahrb. Mai. Ges. 1876, for Limnorea, Dybowslci, 1878 [not of Leach, <f*c.)] 

 type B. angarensis, Qerst. ; sect. = Liobaikalia, Martens, Jahrb. 1876, 

 type B. stiedae, Dyb. ; sect, = Dybowskia, Dall, P. . S. 1876, type . 

 ciliata, Dyb. 



