412 Thirty-fifth Report on the State Museum. 



Hallia divisa, n. sp. 



Corallum simple, turbinate, curved, acute at the base, regularly ex- 

 panding to the calix ; height 15 mm., diameter of the calix 10 mm., 

 depth 5 mm., quite regularly concave; there are two lamellae, com- 

 mencing at the ceuter and continuing to the anterior and posterior mar- 

 gins, which are much more prominent than the others, the one situated 

 on the anterior portion being about twice the length of the other; number 

 of lamellae 50, alternating in size, the smaller ones scarcely more than 

 rudimentary, a few more than one-half of the principal ones converging 

 to the prominent lamella of the anterior side, the remainder toward 

 the center and the prominent lamella of the posterior side. 



Formation and locality. Niagara group, Louisville, Kentucky. 



Hallia divergens, n. sp. 



Corallum simple, turbinate, curved; diameter of calix 20 mm., 

 length of anterior side 22 mm., of posterior side 12 mm.; sides abruptly 

 and regularly sloping to the center; number of lamellae 60, alternating 

 in size, the smaller ones being scarcely more than rudimentary; com- 

 mencing at the center and continuing to the anterior margin is a sin- 

 gle stronger lamella to which about one-half of the others converge, the 

 remainder converging to the transverse lamellae and the center of the 

 calix. 



Formation and locality. Niagara limestone, Racine, Wisconsin. 



Hallia pluma, n. sp. 



Corallum simple, turbinate, diameter of the calix 20 mm., length of 

 posterior side 8 mm., of anterior side 25 mm., sides regularly sloping; 

 commencing at the center, and continuing about half way to the an- 

 terior margin, is a narrow, very shallow fossette, which is scarcely per- 

 ceptible a short distance from the center and along the middle of which 

 is a single lamellae more conspicuous than the fossette ; number of 

 lamellae about 90, alternating in size, the smaller ones being scarcely 

 more than rudimentary; somewhat more than one-half of the larger 

 lamellae converge to the fossette and the median lamella, the remain- 

 der to the transverse lamellae and the center of the calix. This species 

 may be distinguished from H. divergens by the more unequal sides of 

 the calix, the shallow fossette and the finer lamellae. 



Formation and locality. Niagara limestone, Racine, Wisconsin. 



ANISOPHYLLUM, Edwards and Haime. 

 Anisophyllum unilargum, n. sp. 

 Corallum simple, turbinate, slender, acute at the base, regularly ex- 

 panding to the calix ; height 30 mm., diameter of the calix 12 mm., 



