Weller — Kinderhook Faunal Studies. 115 



which traverses the whole outer side of the shell. Width.., 

 of the aperture, 9 mm., length, 7 mm., height of shell above 

 the plane of the aperture, 5 mm. 



Remarks. Waagen * referred all the Bellerophon-like shells 

 with spiral sculpture to the genus Bucania, and he was fol- 

 lowed by DeKoninck f in his work on the Carboniferous 

 fossils of Belgium. It has been shown by Ulrich | however, 

 that a part of these shells in which the revolving striae are 

 parallel with the dorsal band instead of oblique to it, should 

 be separated from Bucania, and he has proposed the generic 

 name Bucanopsis for these species. The species here de- 

 scribed differs from the usual form of the members of this 

 genus, in the less rapid enlargement of the volutions and also 

 in the abrupt deflection of the margin of the shell as it 

 approaches the aperture. 



Upon the card in the University of Michigan collection 

 marked "Types" and labeled as Bellerophon perelegans, 

 there are no less than three distinct species from two distinct 

 horizons. Two of the specimens, from a horizon higher than 

 the Chonopectus sandstone, are apparently the actual types 

 of B. perelegans, but the species should rather be referred 

 to the genus Bucanopsis. The seven other specimens are 

 from the Chonopectus sandstone, six of them being good 

 typical specimens of Bellerophon bilahiatus, the seventh being 

 the specimen here described. It differs markedly from B. 

 perelegans in the more gradual enlargement of the volutions 

 and in the deflected margin. The revolving striae are also 

 somewhat coarser near the aperture, and as it can be identi- 

 fied with no described species it is here described as new. 



Patellostium scriptiferus (White). 



PI. VI. f. 6. 



Bellerophon scriptiferus. Bull. U. S. G. S. 153: 144. 



Shell ventricose, closely coiled, the umbilicus small; inner 

 volutions subglobose, subelliptical in cross section, the last half 

 of the outer volution abruptly expanding towards the aper- 



* Pal. Ind. XIII. 1 : 130. 



t Faun, du Calc. Carb de la Belg. Pt. 4. 



% Pal. Minn. 2:853. 



