462 Thirty-fifth Keport o^ the State Museum. 



Oystiphyllum pustulatum, n. sp. 



Corallum simple, turbinate, more or less rapidly expanding ; pro- 

 portional height and diameter varying ; in some individuals of 35 mm. 

 in height the diameter of the calix is 55 mm., in others, having a 

 height of 80 mm., the diameter of the calix is 40 mm.; exterior com- 

 paratively smooth, with concentric wrinkles and striae, and distinct 

 external costae; calix from 20 to 35 mm. in depth, for a short dis- 

 tance from the margin flat or gently curving, then abruptly and regu- 

 larly sloping to the center; the entire surface of the calix shows prom- 

 inent cysts from 1 to 3 mm. in diameter, increasing but little, if any, 

 in size toward the center ; occasionally a cyst occurs much larger than 

 the ordinary ones; surface of the cysts marked by moderately coarse, 

 interrupted striations. This species is apparently the only one from 

 this locality in which the cysts are not more or less interrupted by the 

 rudimentary lamellae. 



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



Oystiphyllum ikfukdibulum, n. sp. 



Corallum simple, elongate turbinate, usually straight; exterior 

 comparatively smooth, with concentric wrinkles and striae ; exter- 

 nal costae distinct; height from 70 to 100 mm.; calix 50 mm. in diam- 

 eter, depth 40 mm., margin thin, sides regularly sloping to the center, 

 having the form of an inverted cone ; except near the center the cysts 

 are obsolete or greatly obscured by the rudimentary lamellae, which 

 are rounded, apparently nodulose, and about 100 in number; on the 

 decorticated surface the cysts are very distinct. This species most 

 closely resembles C. crateriforme, but the rudimentary lamellae are 

 much coarser, there being only thirteen in the space occupied by 

 twenty- four in that species. 



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



Oystiphyllum obliquum, n. sp. 



Corallum elongate turbinate, simple, height 70 mm.; calix shallow, 

 very oblique, nearly, parallel with the anterior side of the corallum, 

 oval, length 30 mm., width 20 mm.; when the corallum is decor- 

 ticated the lower margins of the successive calices have the appearance 

 of crenulated tabulae ; rudimentary lamellae six in the space of 10 mm., 

 length 5 or 6 mm. from the margin ; commencing at the center of 

 the calix and continuing to the anterior margin is a rounded eleva- 

 tion, which for' about 7 mm. is very prominent, thence gradually sub- 

 siding and becoming inconspicuous ; from the center nearly to the 

 posterior margin is a narrow depression ; the posterior wall of the 

 calix is nearly vertical, 4 mm. in depth, the other portions gently 

 slope to the line along the middle. 



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



