434 Thirty-fifth Report on the State Museum. 



, v v Zaphrentis spissa, n. sp. 



Corallum simple, abruptly turbinate, straight or slightly curved, 

 height of corallum 70 mm.; diameter of calix 50 mm., sides quite 

 regularly concave ; number of lamellae 110, of uniform thickness, 

 alternating in length, the principal ones extending to the center, fasci- 

 culating, coalescing and twisting, presenting a very irregular appear- 

 ance ; fossette conspicuous, commencing a short distance from the 

 center and extending to the anterior margin 



Formation and locality, Oorniferous limestone. Falls of the Ohio. 



Zaphrektis torta, n. sp. 



Corallum simple, elongate turbinate, straight or slightly curved; 

 exterior with concentric wrinkles and striae, and occasional sharp 

 annulaiions j longitudinal striae distinct ; height of corallum 60 mm.; 

 diameter of calix 30 mm., depth 25 mm., sides abrupt. The tabulae 

 for a space of 5 mm. are nearly flat, then elevated about 5 mm., con- 

 tinuing for a short distance and then curving downwards ; number 

 of lamellae 75, alternating in size, the smaller ones being about one- 

 half the thickness of the others ; the principal ones extend to the 

 center of the tabulae, fasiculating and very much twisted ; the sides of 

 the lamellae have moderately strong longitudinal striations ; fossette 

 extending from the center of the calix to the margin, position variable. 



Formation and locality. Oorniferous limestone. Falls of the Ohio. 



Zaphrentis fastigata, 91. sp. 



Corallum simple, turbinate, attenuate below, straight or slightly 

 curved, usually compressed ; longitudinal striae distinct ; height 60 

 mm. ; calix oblique, diameter 25 mm. ; fossette sinistral, extending 

 from near the center about half way to the margin ; number of lam- 

 ellae 75, alternating in size, the smaller ones being not more than one- 

 sixth the thickness of the others ; the principal lamellae extend to the 

 center of the calix coalescing, fasciculating and twisting. This species 

 may be distinguished by its slightly compressed, nearly straight form 

 and great difference in the size of alternate lamellae. 



Formation and locality. Oorniferous limestone, New York. 



Zaphrektis trisutura, n. sp. 



Corallum simple, turbinate, quadrilateral, straight or slighly curved ; 

 longitudinal striae conspicuous ; height 50 mm.; diameter of calix 35 

 mm., sides nearly vertical or slightly convex, space at the bottom 25 

 mm. in diameter ; fossette consisting of a deep depression at the sinis- 

 tral margin of the tabulae ; number of lamellae 70, alternating in size, 

 on the sides of the cup very thin and sharp, adjacent lamellae coalescing 



