212 PALEONTOLOGY OF OHIO. 



of C. papillatus, McCoy; but under a sufficient magnifying power it is 

 readily distinguished by the fine and close tuberculation of the margins 

 of the comparatively minute calices, which gives to the surface an alto- 

 gether characteristic appearance. All the specimens which I have seen 

 of this singular form are parasitic upon the valves of Strophomena alter- 

 nata,, Conrad, and I am informed by Mr. U. P. James that it rarely or 

 never occurs in any other situation. I have named the species in honor 

 of my friend Prof. Edward Orton, from whom I first received specimens. 



Position and locality: Cincinnati group, Cincinnati, Ohio. 



Chjetetes Newbereyi, Nicholson. 



Plate 22, figs. 4, 4a. 



Corallum forming a thin, nearly circular or semi-circular expansion, 

 about one-third of a line in thickness, and from ten lines to an inch or 

 more in diameter, and apparently growing parasitically upon submarine 

 objects. Surface almost wholly destitute of elevations and never exhib- 

 iting distinct tubercles, but presenting well-marked and conspicuous 

 groups of large sized corallites, which are placed from one line to a line 

 and a half apart, and can hardly be said to be raised at all above the gen- 

 eral surface. Calices more or less polygonal or sub-quadrate, with re- 

 markably thin walls, often arranged in tolerably regular diagonal lines, 

 never exhibiting any minute interstitial tubuli. The ordinary calices 

 are about eight in the space of one line, the larger sized ones, occupying 

 the definite groups, about six to one line; and from the thinness of the 

 walls both appear to be unusually large. The margins of the calices are 

 not tuberculated or granulated, and the corallites are perpendicular to 

 the surface. 



The distinctness of this species is unquestionable; but I have not 

 been able to satisfy myself that it is attached parasitically to foreign 

 bodies. From the fact that the expansions in some instances have the 

 shape of Strophomena alternata, and from the great tenuity of the coral- 

 lum when broken across, I should conclude that it must certainly be an 

 incrusting species ; but I have not yet seen a specimen in which I could 

 demonstrate the existence of any foreign body beneath the crust. If not 

 incrusting, it must have been free, and have been provided with an 

 epitheca below ; but this seems very unlikely. 



Apart from its mode of growth, C. Newberryi may be said to represent 

 C. pulchellus, Edw. and H., which it resembles in its smooth surface and 



