Upper Helderberg G-roup.. 463 



Cystiphyllum scalatum, n. sp. 



Corallum simple, elongate, curved, sometimes tortuous; exterior 

 with numerous concentric wrinkles and constrictions caused by inter- 

 mittent growth ; height of corallum 45 mm.; diameter of the calix 15 

 mm., depth 15 mm.; for a distance of 4 mm. from the margin of the 

 calix the walls are thin and vertical, then for the space of 2 mm. flat, 

 again vertical for the space of 3 mm., thence sloping to the bottom of 

 the calix; a strong, rounded elevation extends from the center to the 

 anterior margin ; rudimentary lamellae on the sloping portion of the 

 calix strong, 1 m. in width, bifurcating as they approach the margin. 

 The broad rudimentary lamellae resemble those of Cystiphyllum, 

 but the cysts, if they exist, are very obscure. In the shape of the 

 calix it varies from any known species. 



Formation and locality. Corniferous limestone, New York. 



Cystiphyllum striatura, n. sp. 



Corallum simple, elongate turbinate, curved, acute at the base, reg- 

 ularly expanding to the calix ; height 45 mm.; calix 15 mm. in diam- 

 eter, depth 8 mm., regularly concave ; fossette narrow, extending 

 from the center to the anterior margin ; a space at the center 5 mm. 

 in diameter convex, nearly smooth ; number of rudimentary lameJke 

 30, of equal size, converging to the fossette and convex area at the 

 center ; no cysts visible in the calix ; when decorticated the cysts ait 

 very distinct on the exterior. 



Formation and locality. Corniferous limestone, New York. 



COLEOPHYLLUM, n. g. 



Cyathophylloid corals, growing singly ; the substance composed 

 chiefly of a series of closely arranged, invaginated tabulae, which are 

 more or less oblique to the axis; rays obscure or obsolescent; calices 

 oblique. 



Owing to the partial development or incomplete continuity of the 

 tabulae, broad, shallow vesicles are sometimes formed. 



COLEOPHYLLUM EOMIKGERI, 11. sp. 



Corallum simple, straight, erect. Tabulae extremely oblique, 

 closely arranged, scarcely united along the posterior median line; rays 

 fine, obscure, becoming obsolete toward the middle of the shallow 

 calyx, and converging toward the posterior fossette. Base of attach- 

 ment expanded. 



The specimen figured is a straight, erect form, partially silfcified and 

 decorticated. The exterior had originally fine longitudinal striae. In 

 its present condition the posterior side is marked by a narrow slit or 

 fissure, which is apparently due to a deep fossette on this side, and has 

 become conspicuous by the removal of the epitheca. 



Formation and locality,— Corniferous limestone, Falls of the Ohio. 



