n/. . CONTRIBUTION TO 



H E L I O P H Y L L U M ,C R O T ALU M, N. Sp. 



Plate 34. Fi(;s. 5, 6. 



Coralluni siin])le, turbinate, straight or curved. Attenuate at the base of 

 attachnnent, rapidly expanding in diameter to the ealix. Length of eorallum 

 on the side of the longest eurxature, sevent3^-five millimeters; length on the pos- 

 terior side, thirty-five millimeters. Exterior with undulations and wrinkles 

 caused by intermittent growth. (alix broadly cam])anulate, fort3'-fr\''e milli- 

 meters in diameter. A tiat space in the bottom of the calix, occupied by the- 

 tabuhe, fifteen millimeters in diameter. Number of lamella', one hundred and 

 thirty-six, in the circumference of a calix forty-five millimeters in diameter, al- 

 ternating in length, sube(|ual at the margin, gradiudly sloping to the fiat space 

 in the bottom of the calix, where the short ones terminate, the longer ones con- 

 tinue, coalescing and faseiculating and is slightly elevated in the center of the^ 

 calix, Fossette conspicuous, consists of a deep groove at the bottom of the ca- 

 lix, and continues to the anterior margin. Denticulations rather obscure, 

 though in protected places they are more pronounced. 



Found in the Upper Devonian (Hamilton group) two miles north-west of 

 (Jharlestown, Indiana. Now in the collection of the author. 



Z A P H R E N T ] S W E B E R I , N. Sp. 



Plate 84. Fios. 7, S, 9, 10, 11. 



(Jorallum simi)le, turbinate, straight or regularly curved, usually with a: 

 broad sear at the base of attachment, while some examples are acute at the 

 point of attachment. Height from thirty to sixty millimeters, varying in dif- 

 ferent individuals. (Tradiutlly, or at times, rapidl}^ increasing in diameter to 

 the calix. Kxterior with rough, rounded annulations, and wrinkles. Longitudinal 

 strije coarse, distinct, six in the space of five millimeters. Calix usually slightly 

 oblicjue, twenty to thirty millimeters in diameter. Depth ten to twenty milli- 

 Jiieters. Situated in the center of the calix, is an oblicpie concave space, oecu- 

 j)ied by the tabuhe, from five to ten millimeters in diameter. Number of la- 

 melhe, ninetj^-six in the circumference of a calix, twenty-five millimeters in di- 

 ameter, sharp, and unecpial in size at the margin, alternating below, the short 

 ones scarcely more than rudimentary; the longer ones gradiially slope to the 

 smooth, oblicpie space in the V)Ottom of the calix, and abruptly terminate, leav- 

 ing a smooth, obli(iue, concave space, in the bottom of the calix, from five to 

 ten millimeters in diameter. Fossette rather obscure; when visible it is situated 

 on the side of the longest curvature of the coral. 



