1 8 79-] ^^^ Paleontologist. 19 



One of the specimens used for this description is built upon coral, nearly 

 2x2 inches, the other is attached to a fragment of limestone and is over 2 

 inches one way by nearly an inch the other. Mr. W. H. Bean informs me 

 that he found one of them at a horizon 10 to 20 feet below the large Orthis 

 biforata bed near Lebanon, Warren Co., O , (Cincinnati Group), the other at 

 a higher horizon, but in the same vicinity. 



These typical specimens are in Mr. Bean's cabinet at Lebanon. 



GENUS ALVEOLITES, (Lamarck.) 



Alveolites expansa. (sp nov.) (James.) [expansa — spread out.) 



Corallum, a flat or undulating expansion, irregular in outline, 6 inches or 

 more in diameter, varying in thickness from less than one to over two lines. 

 Corallites very oblique and more or less sinuous in their direction from the 

 base or central axis to the surface. Calices very narrow, slightly curved, 

 elongated slits, showing, generally, when a little weathered, a tooth-like pro- 

 jection in the middle of the upper lip, and arranged sometimes in series of 

 short curved rows in a more or less alternating manner. About 4 calices in 

 the space of a line. Walls of corallites thick. 



.Although the specimen from which this description is made was found 

 spread over the surface of a rock — from which it readily scaled off — it is not 

 certain that it was encrusting, as there is an appearance of something like a 

 central axis from which the corallites grew in different directions to opposite 

 surfaces, in a very oblique manner ; portions of the side next the rock show 

 calices similar to the other side, but not so distinct, as it is mostly covered by, 

 apparently, indurated clay. 



Found by Dr. L. B. Welch and the author in a thin stratum of the Upper 

 Silurian Formation, Clinton Group, near Wilmington, Clinton Co., O. 



GENUS FISTULIPORA, (McCoy.) 

 Fistulipora Siluriana. (sp. nov.) (James.) 



{silitriana — in allusion to the Silurian Formation.) 



Corallum composed of irregular expansions grown upon foreign substances 

 — generally other corals — from ^ a line to 2 lines or more in thickness. Perfect 

 specimens show the cell walls rather thick, and raised considerably above the 

 general surface on one side, sloping off to the opposite side. Calices circular 

 or oval, 6 to 8 in the space of one line including interspaces In some cases 

 the walls of the corallites are in contact, but generally they are separated 

 about half their diameter. Coenenchyma occupied, generally, by minute pores, 

 but in some cases weathered specimens show very thin web like disseppi- 

 ments. The calices are sometimes arranged in rows of 5 or 6, but generally 

 they are irregularly placed with the higher parts standing in different positions 

 in relation to each other. Looking directly at the surface the cell walls of 

 perfect specimens appear somewhat like many small vertical, closely set, 

 obliquely truncated tubes with distinct solid walls. A detached example 

 shows a strongly marked, wrinkled and striated epitheca, and three super- 

 imposed layers. 



Some of the calices of this species are occupied by substances, rounded on 

 top with very small central openmgs and distinct borders below the tops of the 

 apertures. Specimens slightly worn resemble, in some cases, F. mvltipora, sp. 

 James, and are occasionally grown on the same bodies, but the prominent 

 obliquely truncated corallites, and absence of groups of small pores occupying 

 the places of the larger cells in F. multipora, distinguish it from that species, 

 in which they do not project above the general surface, and are mostly more 

 angular. 



Found on the hills at Cincinnati, some 300 or 400 feet above low water 

 mark of the Ohio River. 



