346 EIGHTEENTH BEPORT ON THE STATE CABINET. 



This species has a more elevated spire than T. umbilicata of the Tren- 

 ton limestone and, so far as can be determined, has had no umbilicus. 



Formation and locality. In limestone of the Niagara group, at Kacine 

 and Greenfield, Wisconsin. 



GENUS EUNEMA (Salter). 



EUNEMA? TRILINEATA. 



Shell turreted : spire ascending, composed of four or five volutions which 

 are moderately rounded and gradually increasing in size to the last one, 

 which is somewhat ventricose. Surface of volutions marked by slender 

 revolving lines or ridges, crossed by close concentric striae which in some 

 places are elevated in bands or fascicles. 



The surface characters are remarkable for a shell in this geological 

 position, and more nearly resemble those of the Devonian or Carbonife- 

 rous fauna. 



Formation and locality. In limestone at Racine, Wisconsin. 



GENUS LOXONEMA, 

 LOXONEMA? ' ' ' sp. 

 Compare Loxonemafitchi : Hall, Pal. N. T. Vol. iii, pa. 296, pi. 54, f. 9 and 11. 



A specimen preserving seven or eight volutions, has the form and pro- 

 portions of the Lower Helderberg species. The impression does not furnish 

 any external markings, and its relations to Loxonema are inferred from the 

 absence of a carina. 



Formation and locality. In limestone of the Niagara group, at Wauwa- 

 tosa. From Dr. H. Day. 



GENUS SUBULITES (Conrad). 

 SUBULITES VENTRICOSA. 



SubuUtes ventricosa : Hall, Pal. N. Y. Vol. ii, pa. 347, pi. 83, f. 7. 



This species occurs at Wauwatosa ; received from Dr. H. Day ; and 

 also at Bridgeport, Illinois, collection of T. J. Hale. 



GENUS BUCANIA (Hall). 



BUCANIA ANGUSTATA. 



Bucania angustata : Hall, Pal. N. Y. Vol. ii, pa. 349, pi. 84, f. 6. 



A specimen undistinguishable from the species occurring at Gait, 



Canada West, has been found at Racine in Wisconsin. 

 42 



