58 The Paleontologist. [April 16, 



MoNTicuLiPORA ciRCULARis. James. 



Tke Paleontologist, September 12, 1882. 



A synonym for this species, under the name Hmrisi (Calloporella 

 harrisi), Uh-ich, is published in the Journal of the Cincinnati Society of 

 Natural History, for April, 1883. 



GENUS AGELACRINUS. Vanuxem. 



Agelacrinus warrenensis, sp. nov. James. 



(Plate II., figs. 3 and 3a.) 



Body circular, varying in diameter from i^th of an inch to ^ an inch 

 or more. Attached to the convex valves ofStrophomena, and, probably, 

 other foreign substances; the under side concave, or otherwise, conforming 

 to the surface grown upon. Disc composed of many squamiform plates, 

 overlaping inward from the periphery; the plates of the outer margin 

 very small and arranged in a narrow rim all round, the larger plates 

 taking their place abruptly. About one line or a little more inward the 

 surface becomes suddenly depressed, causing quite a sharp outward 

 ridge, in most cases all round, by the projecting edges of the plates; 

 and then rises, gently at first, but abruptly nearer and to the center, 

 forming a somewhat prominent dome. The rays or arms nearly hidden 

 by the imbricating plates in all the specimens examined ; but occasion- 

 ally some of the arms are partly but indistinctly shown, as is the case in 

 the figured specimen. The ovarian aperture is hidden, probably, in the 

 same way, it not being shown in any one of the specimens. All but one 

 of the ten examples used for this description show the above specified 

 characters, and that one is, evidently, in an abnormal condition by 

 lateral pressure. 



Found by Dr. T. D. Dyche, of Lebanon, Warren Co., O., in beds of 

 the Cincinnati Group, equivalent to the tops of hills at Cincinnati. 

 The type specimens are in Dr. Dyche's fine collection. 



GENUS HELOPORA. Hall. 

 Helopora harrisi, sp. nov. James. 



(Plate II., figs. 2, 2a aud 25.) 



The numerous well defined sections of this species, lying upon and 

 embedded in the surface of a small slab of limestone, examined for this 

 description, consist of delicate stems, with generally a single row of 

 much elongated oval cells, on the exposed face, but occasionally — seldom — 

 two rows are shown: the number of rows of cells on any one section 

 undetermined, two at least, and may be three or four on some or all 

 specimens ; the difficulty in ascertaining this point definitely is in not 

 being able to obtain detached examples, owing to the extreme delicacy 

 of the stems; in removing them from the slab they crumble into small 



