LIMNAEACEA. 243 



Sub-Genus PLANORBULA, Hald. (type P. armigens, 

 Say). 



18. Planorbis (Planorbula) armigems, Say. 



25 Michigan and New York; ex c. Prof. W. Newoomb, Rev. E. B. 

 Beadle, &c. 



5 Prince Edward's I. ; coll. A. Nevill, Esq. 



Sub-Genus ANISUS, Fitz. (type P. carinatus, Miill.). 



{Fide Carus and Grerst. = Tropidiscus, Stein, and 

 Gyrorbis, Moq. T.) 



19. Planorbis (Anisus) vortex, Linn. 



6 England ; coll. G. Nevill, Esq., and ex o. As. Soc, Bengal. 

 11 Potsdam ; ex o. Dr. Ed. von Martens. 



20. Planorbis (Anisus) kermatoides, Orb. 



6 Pern ; coll. A. Morelet, Esq. 



21. Planorbis (Anisus) marginatus, Drap. 



2 Neufchatel; ex c. As. Soc, Bengal. 



3 England ; coll. G. Nevill, Esq. 



22. Planorbis (Anisus) subangulatus (?), Phil. 



var. 

 40 Asupas, Persia; coll. W. T. Blanford, Esq. 



var. (? n. species). 



6 Tangitan ; coU. Dr. P. Stoliczka. 



23. Planorbis (Anisus) carinatus, MiiU. 



7 Austria ; ex c. Dr. P. Stoliczka. 

 2 Ireland; coll. Dr. T. Oldham. 



4 Potsdam ; coll. Dr. Ed. von Martens. 



Sub-Genus NAUTILINA, Stein. 

 {Fide Carus and Gerst. = Gyraulm, Agassiz and Binn.) 



24. Planorbis (Nautilina) santacruzensis (?). 



20 St. Croix ; ex c. Prof. W. Newcomb (?) 



25. Planorbis (Nautilina) parvus, Say. 



40 New York ; ex c. Prof. W. Newcomb and W. A. Brown, Esq, 



