

New Species of Paljeozoic Fossils. 193 



Formation 2Md locality. In the " Hydraulic beds " at Louisville, 

 Ky. Cabinet of Dr. James Knapp. 



POLYPHEMOPSIS LoUISVILLtE U. Sp. 

 Twenty-third Report on the N. Y. State Cabinet, Plate 12, figs. 1 and 2. 

 Shell small, veutricose, consisting of about six rapidly tapering 

 volutions, the last of which comprises about two-thirds the entire 

 length of the shell. Aperture large, ovate, widest below the middle, 

 and pointed at the upper angle; a little more than half as long as 

 the shell. Columella slight ; suture scarcely impressed. Surface 

 smooth. 



Formation and locality. In the Upper Helderberg limestone at 

 the Falls of the Ohio. From the cabinet of Dr. Knapp, of Louis- 

 ville, Ky. 



LOXONEMA HYDRAULICA n. Sp. 



Sliell slender, turreted ; volutions, about nine in a specimen one 

 inch in length, rounded, rapidly ascending; suture deep, giving a 

 constricted aspect to the shell ; striae distinct, angular, somewhat 

 abruptly bent backward from the suture to the summit of the volu- 

 tion, which is above the middle of its length ; thence curving more 

 gently forward to the suture, and on the last . volution abruptly 

 recurved to the columellar lip. 



Formation and locality. In the hydraulic limestone of the Falls of 

 the Ohio. Cabinet of Dr. James Knapp. 



Trochonbma emacerata n. sp. 



Shell turbinate, consisting of four or five volutions, the U})per ones 

 moderately convex and bicarinate; the suture line commences a little 

 below the second carina. The last volution is very ventricose with a 

 j rounded aperture; umbilicus small. 



Surface marked apparently only by lines of is^rowth. 



I - This species differs from T. tricarinata Meek, in the more elevated 

 spire, the sloping upper side of the volutions between the suture and 

 , first carina, and in having two carinas with an interspace equal to that 

 j above and below, while there is no evidence of a carina bordering the 

 ' narrow umbilicus. 



FormMion and locality. In limestone above the '' Hydraulic 

 , , beds," near Louisville, Ky. Cabinet of Dr. James Knapp. 



' Trochonema rectilatera n. sp. 



I Shell turbinate, breadth and height almost equal ; volutions about 

 five, carinated above with straight, nearly vertical sides ; outer one 

 13 



