NO. 1192. TBENTON FAUNA OF BAFFIN LAND— SCSUCHEBT. 165 



Family BELLBEOPHOl^TIID^. 



BELLEROPHON SIMILIS Ulrich and Scofield. 



Belleroplwn similis Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 919, 

 pi. Lxiv, figs. 31-39. 



Of this species there are two examples, one of which is identical 

 with Ulrich's figures thirty-two and thirty-three of the work cited. It 

 is one of the characteristic fossils of the Trenton or Galena stage of 

 Minnesota. 



Collector.— A. H. White. Gat. No. 28174, U.S.I^.M. 



Family PLEUROTOMARIID^ d'Orbigny. 



LOPHOSPIRA SPIRONEMA Ulrich and Scofield. 



Lopliospira spirovema Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 983, 

 pi. Lxxii, figs. 44-47. 



This is the most abundant gastropod found at Silliman's Fossil 

 Mount. The species was at first thought by the writer to be L. Jill- 

 morensis Ulrich and Scofield, but Mr. Ulrich, to whom three examples 

 were sent, pronounced it L. spironema. The Arctic examples attained 

 a far larger size than the Black Eiver specimens of Minnesota. 



Collectors.— A. H. White and J. N. Carpender. Cat. No. 28177, 

 U.S.N. M. Other specimens collected by R. W. Porter are in the Ameri- 

 can Museum of Natural History. 



LIOSPIRA AMERICANA (Billings). 

 Liospira americana Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 996. 



This very widely distributed and common species is abundant at 

 Silliman's Fossil Mount. The large umbilicus is completely filled with 

 shell matter, but above in the earlier whorls it is open. 



Collectors. — A. H. White, A. V. Shaw, J. N, Carpender, and E. W. 

 Porter. Cat. No. 28180, U.S.N.M. 



CLATHROSPIRA CONICA Ulrich and Scofield. 



Clathrospira conica Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 1008, 

 pi. LXX, figs. 1-4. 



This is one of the abundant species'at Silliman's Fossil Mount, and in 

 the United States ranges from the Black Eiver group into the middle 

 of the Cincinnatian group. The Arctic examples attained a larger 

 size than elsewhere, but otherwise are considered by Mr. Ulrich to be 

 in harmony with his species. 



Collectors. — J. N. Carpender, A. V. Shaw, and A. H. White. Cat. 

 No. 28178, U.S.N.M. The American Museum of Natural History also 

 has specimens collected by Mr. E. W. Porter. 



