154 



Cincinnati Society of Natural History. 



Amjtlexopora, Ulrich. — Ramose, free, or inerusting. Cellular 

 structure as in Monotrypella, excepting that more or less numerous 

 spiniform tubuli are developed, which sometimes complete^' encircle 

 the tubes. Cincinnati to Sub-carboniferous. 



Stenopora, Lonsdale. — Zoarium ramose, or sub lobate. In the 

 peripheral region the tube walls are periodically thickened. Com- 

 paratively large spiniform tubuli are developed at the angles of the 

 cells. Diaphragms straight, not numerous. Connecting foramina 

 occasionally preserved. Carboniferous. 



Batostojna, Ulrich. — Irregularly ramose, with a large basal expan- 

 sion, by means of which the zoarium is attached to foreign bodies. 

 Cell-apertures in the outer portion of the branches irregularly ovate 

 or circular, and surrounded by a distinct ring like wall. Interstitial 

 tubes more or less numerous, very irregular in shape and size. Spini- 

 form tubuli numerous and well developed. Cincinnati. 



Batostomella, Ulrich. — Ramose, branches smooth, usually small. 

 Cell apertures small. Interstitial cells and spiniform tubuli few to 

 numerous. Walls of tubes in the peripheral region thick, and seem- 

 ingly fused together. Trenton to Carboniferous. 



Leiocle?na, Ulrich. — Ramose, slender, not tuberculated. Proper 

 zooecia small, surrounded by two or three series of angular inter- 

 stitial cells. Spiniform tubuli well developed; numerous, but re- 

 stricted to the walls of the proper zocecia. Diaphragms stout, but 

 rather remote in both sets of tubes. Carboniferous. 



Atactopora, Ulrich. — Inerusting; surface usually studded with 

 ^monticules' or "maculae/' Cell-apertures more or less petaloid, 

 surrounded by from one to three rows of small blunt spines. Inter- 

 stitial cells gathered into clusters, or scattered more equally among 

 the proper cells. Tube-walls inflected b} 7 the encroachment of the 

 numerous spiniform tubuli. Diaphragms occur in both kinds of tubes. 

 Occasionally cystoid diaphragms are present. Trenton and Cincinnati. 



Callopora, Hall. — Ramose to sub-frondescent, smooth or tubercu- 

 lated. Cell-tubes cylindrical, their apertures often closed by an oper- 

 culum, with a very small central perforation, from which usually radi- 

 ate small ridges. Interstitial cells, more or less numerous, sometimes 

 complete^ isolating the proper zocecia. Diaphragms numerous. Spin- 

 iform tubuli and cj'stoid diaphragms Vanting. Cincinnati, Niagara 

 and Lower Helderberg. 



Calloporella, Ulrich. — Free and probably inerusting thin expan- 

 sions. Tubes cylindrical, with thick walls, and separated by one or 



