62 NEW YORK STATE MUSEUM 



to believe that the former could hardly with safety be referred to the large, 

 very coarsely ridged shell which Whitfield described 'as Euomphalus 

 macrolineatus from the dolomites at Manitowoc Wis. In size and sur- 

 face characters P. scamnata approaches very closely Lindstrom's Hori- 

 ostoma lineatu m, z having the same sculpture throughout, but the 

 latter has its spire greatly depressed and the body whorl attached at 

 the aperture. 



Poleumita (?) sulcata Hall (sp.) 



Plate 10, fig. 1-4 



Cyclonema sulcata Hall, Paleontology of New York. 1852. 2:347, pi. 84, 



fig. ia-d 

 Trochonema (Pleurotomaria) pauper Hall, New York State Cab. Nat. 



Hist. 20th An. Rep't. 1867. p. 343, pi. 15, fig. 5, 6, 9 



Cyclonema sulcatum Whiteaves, Paleozoic Fossils. 1884. v. 3, pt 1, p. 18, 



pl- 3, fig- 5 

 Polytropis sulcatus Whiteaves, Paleozoic Fossils. 1895. v. 3, pt 2, p. 89, 

 pl. 13, fig. 9, 9a 



The original of this species was a shell from the " Onondaga Salt 

 group, Newark, Wayne co., N. Y." With it were described other speci- 

 mens obtained by Professor Hall on his visit to the Canadian Guelph 

 localities in 1848. The early illustrations, which are not altogether satis- 

 factory for the requirements of identification among so many similar shells, 

 have been supplemented by the figures given by Whiteaves as above cited. 

 The species appears to be among the rarer gastropods of the Guelph forma- 

 tion, but in the Rochester material we find several examples of it, some of 

 them preserving the detail excellently, and we also have the same spe- 

 cies from the dolomites of the upper Guelph at Shelby. Whiteaves has 

 redescribed the species in full, and we find no pronounced disagreement 

 therewith among our shells. Characteristic of it are (1) the notable ele- 

 vation of the spire, which is considerably greater than the basal diameter 



1 Geol. Wisconsin, 4 : 294, pl. 18, fig. 5, 6. 



2 Silurian Gastropoda, p. 173, pl. 20, fig. 42-44. 



