GUELPH FAUNA IN THE STATE OF NEW YORK 75 



xrochonema Salter. 1859 

 Trochonema cf. fatuum Hall 



Plate to, fig. 5 



Trochonema (Eunema) fatua Hall. N. Y. State Cab. Nat. Hist. 20th An. 

 Rept. 1867. p. 345, pi. 15, fig. 7, 8 



The upper Shelby dolomite has afforded a single imperfect example, 

 comprising parts of the ultimate and penultimate whorls which bear the 

 expression of the species cited above, showing a very broad peripheral 

 band with raised margins and somewhat depressed surface, a direct slope 

 above this band which is about as wide as the band itself, and a gently con- 

 vex surface beneath. Faint concentric lines may be seen on the surface of 

 this cast. 



The original of this species is described from the Racine dolomites at 

 Racine Wis. It is also cited 1 as occurring in the Guelph at Cedarburg 

 Wis., but it is not recorded in the Canadian Guelph. 



buomfhalcs Sowerby. 1812 

 Euomphalus fairchildi sp. nov. 



Plate 8, fig. 3, 4 



Shell of medium size, discoidal, with the apex of the spire depressed 

 below the summit of the body whorl and lying almost in a horizontal plane. 

 Volutions four to five ; all in contact, but no impressed zone is formed, 

 and at or near the aperture the body whorl seems to become almost 

 detached. On the cast these volutions are free. Whorls oval in section, 

 one third higher than wide ; outer slope depressed convex and broad, upper 

 side obscurely subangular, lower more broadly rounded ; aperture appar- 

 ently oval, not thickened, with a broad emargination on the upper side ; 

 umbilicus wide, exposing all the whorls. 



Surface covered with sharp and fine, rugose concentric lines, which 

 curve forward over the broad peripheral surface of the whorls and make a 



1 Geol. Wisconsin, 2 : 380. 



