Prof. H. A. Nicholson — On some New Devonian Corals. 31 



Cystiphyllum Ohioense, Nicholson. PL I. Figs. 2, la. 



Spec. char. — Corallum small, turbinate, simple, sometimes 

 twisted, but usually straight, or slightly curved. Length of corallum 

 usually about six lines, varying from four to nine lines ; the calice 

 varying in diameter from four to six lines. Epitheca distinct, marked 

 with longitudinal striae, and usually showing well-marked annula- 

 tions and constrictions of growth. No calicular gemmation, nor 

 radiciform prolongations of the epitheca. Calice not oblique, very 

 deep, generally occupying from one-third to two-thirds of the entire 

 length of the corallum, not flattened below. The interior of the 

 calice shows more or less distinct septal striae, thirty or more in 

 number. Vesicles of the interior small. 



The dimensions of an average specimen are : length, eight lines ; 

 diameter of calice, six lines ; depth of calice, four lines and a half. 



This pretty little species is readily distinguished from all others 

 previously described, although the specimens upon which it is founded 

 are much silicified, and do not exhibit sdme points of structure as 

 well as could be desired. The species is characterized by its uni- 

 formly small size, its deep, pointed, and not oblique calice, the 

 presence of distinct septal striae, and the absence of radiciform pro- 

 longations of the epitheca. It is most nearly allied to C. mundidum, 

 Hall, from the Devonian of Eockford, Iowa (Twenty-third Annual 

 Report on the State Cabinet, 1874), but is distinguished by its 

 smaller size, the smaller number of its septa, and its much deeper 

 and more pointed calice. 



Locality and Formation. — Common in the Corniferous Limestone, 

 Columbus, Ohio. 



Cystiphyllum squamosum, Nicholson. Plate I. Figs. 4, ia, 45. 



Spec. char. — Corallum simple, turbinate, but extraordinarily 

 flattened. Dorsal surface greatly expanded, nearly or quite flat ; 

 lateral margins straight, and forming an angle with the curved 

 ventral surface, which is much reduced in size. Calice extra- 

 ordinarily oblique, making an angle with the dorsal surface of not 

 more than 10° or 12°, very shallow and widely open, its deepest 

 point being situated at a point about one-third of the length above 

 the base. Vesicles of the interior about one line in diameter. 

 Owing to the fact that all the examples of this coral which have 

 been examined are converted into orbicular silica, the characters of 

 the septal striae and epitheca cannot be determined. Some speci- 

 mens exhibit the same form of calicular gemmation as is seen in 

 G. vesicidosum, — that is to say, the coral continues growing for a 

 certain period, and then sends up a fresh calice from the centre of the 

 old one. In this species, however, the new calice, instead of being 

 continued in the axis of the coral, is directed more or less nearly at 

 right angles to the plane of the old calice. 



The dimensions of the largest individual observed are as follows : 

 Length, measured along the dorsal surface, twenty-four lines ; length, 

 measured along the ventral surface, seven lines ; greatest thickness, 

 seven lines ; diameter of calice, twenty-one lines ; greatest depth of 



