THE NAUTILUS. 33 



Length 29, diam. 10, length of aperture 10.3, width 8.3 mm. 



Length 29.5, diam. 10, length of aperture 11, width 7.8 mm. 



Ibuki, prov. Omi, Japan (Y. Hirase). 



I refer this form with some doubt to B. extorris Brancsik (Jahr- 

 esheft Nat. Ver. Trencsiner Comitates, 1891, p. 81, pi. 7, f. 3), de- 

 scribed as probably from Japan ; but that species has a narrower 

 aperture very like that of B. cantori, and is a more slender shell 

 than this one, with the aperture and diameter less than one-third the 

 length of the shell, while in var. omiensis these measurements ex- 



O * 



ceed one-third. B. e. omiensis is a narrower shell than B.japonicus, 

 with an additional whorl and folded columella. The peristome and 

 parietal callus are more developed than in B. reinianus. 



Buliminus callistoderma, n. sp. 



Shell rimate, thin, conic, somewhat translucent, of a brownish 

 olive color; somewhat glossy, densely gramdose in spiral series. 

 Spire rather straightly conic; apex obtuse, Whorls of, convex, the 

 last a little ascending in front, swollen, convex beneath. Aperture 

 irregularly ovate ; peristome thin, expanded ; columellar margin di- 

 lated, reflexed above; parietal callus a mere translucent film, not 

 tuberculate or thickened near the posterior angle. 



Length 10, diam. 5.5, length of aperture 4.9 mm. 



Ogasawara Shima (Bonin I.), Japan (Y. Hirase). 



Quite unlike other Japanese or Loo Choo species in its short, conic 

 form, the. small number of whorls, thin shell, and densely granulose 



surface. 



(To be continued.) 



SUPPLEMENTAL NOTE ON PLANORBIS CORPTJLENTUS SAY. 



BY BRYANT AVALKER. 



Dr. E. W. Hubbard, of Elyria, Ohio, whose catalogue of shells of 

 that State was published at an early date, and who there cites P. cor- 

 pulentits as one of the species represented in his collection, was a 

 grandfather of Mr. George H. Clapp, of Pittsburg, Pa. Mr. Clapp 

 has kindly sent to me for examination two sets of Planorbis from Dr. 

 Hubbard's collection, labeled P. corpnlentits, one from Elyria, the 

 other without locality. Both are P. trivolvis and do not differ from 

 that species as usually found. This unexpected verification of the 



