18/8.] The Paleontologist. il 



Lyellia Americana (Milne-Edwards.) I have good specimens from the Niagara 

 Group, Clinton Co., Ohio, of what correspond very well with this species as defined by 

 Rominger. The largest example is sub-circular in horizontal outline, of a tolerably uni- 

 form thickness of about one inch, and lo inches in diameter On the base the tubes are 

 shown in prominences about a line in height above the general surface, caused, apparently, 

 by the weathering away of the coenenchyma. A longitudinal section shows the '' carinated 

 columns." 



GENUS CHAETETES, (Fischer.) 



ChaeteteS SUbrotunduS. (sp. nov.) (James.) Corallum small, free, sub-rotund. 

 Cut polished sections in different directions show the corallites as growing from the center 

 of the corallum outward in every direction and increased by fission. No tabulae passing 

 throtigh the corallites apparent, they may be found, however, in other examples. Trans- 

 verse disseppiments between the corallites strong. Calices unequal in size, some much 

 larger than others, and an average of about 8 in the space of a line. In the cut sections, 

 the spaces between the disseppiments appear like rows of minute pores arranged longitu- 

 dinally between the corallites. 



The examples from which this description is made, are a little over ^ of an inch in 

 diameter, slightly flattened; the proportions of measurement about as 5 to 6. 



T am indebted to Dr. L. B. Welch, of Wilmington, O. for the type specimens of this 

 species, who found them near Ogden Station, Clinton Co., O., Cincinnati Group. 



Chaetetes lycoperdon. (Say.) The typical form of this species is, as the name 

 indicates, decidedly puff-ball shape. Attachment at the base small, expanding rapidly at 

 first, then gradually rounding off dome-shape or hemispherical. There are, however, 

 variations from this outline, but the base attachment is always smaller than the fossil 

 above — sometimes not over '4^ of an inch with the specimen 3^ or an inch in diameter )l 

 or y-2, an inch above the base. Calices generally circular or slightly angular, 10 to 12 in 

 the space of a line, with groups of calices a little larger than the average, not raised above 

 the general surface. A very few minute interstatial pores, sometimes. 



Although Say's original description, or its place of publication, do not seem to be 

 known, the name is so characteristic of the forms here referred to, it would seem proper 

 to retain it. The ramose forms described by Prof. Hall as varieties of this species, are 

 now considered as distinct. 



Chaetetes petropolitanus. (Pander.) This species is by some placed as a syn. of 

 the above, but it seems to be distinct. It has a broad base, often attached to shells, and 

 has a concentrically lined or wrinkled epitheca, which I have never found in lycoperdon ; 

 the shape is conical, generally at a high angle — from 60 to 80 degs. but sometimes, 

 especially young specimens, gently convex. But the base in all cases is much broader 

 than the upper part, spreading out to a thin edge bell-shape. The corallites are 5^ larger 

 or twice as large as in lycoperdon. Calices polygonal, 6 to 8 in the space of one line, with 

 groups of larger ones — not over 4 to a line — slightly elevated above the general surface 

 in most specimens. The surface features of this species resembles Ch. pulchellus, Ed. & 

 Haime, but its mode of growth is entirely different: C. pulchellus taking the ramose form 

 of cylindrical, branching stems, the corallites growing from the middle outward on all 

 sides, while C. petropolitanus grew from the broad base upward. 



Another species or variety of this group, with calices much like petropolitanus, grew in 

 an entirely diffc-ent manner, turbinate in form; base attachment small. In outline this 

 resembles some specimens of lycoperdon, but the calices are nearly twice as large and 

 mostly hexagonal. If these differences prove to justify a new species, I propose the name 

 turbinatufn (( haetetes turhinatuni .) 



Position and locality — Lower Silurian, Cincinnati Group, from the lowest to the highest 

 exposed beds at Cincinnati and vicinity. 



GENUS CALLOPORA, (Hall ) 



Callopora MilfordensiS. (sp. nov.) (James.) Polyzoary encrusting other bodies ; 

 frequently found on crinoidal columns; generally the wall of each cell is distinct, but 

 sometimes they are in contact ; interspaces occupied by small pores of various irregular 

 shapes. Cell appertures in most cases elevated, oval or sub-polygonal, with no apparent 

 regularity of arrangement, their longer diameter being in all directions on the Polyzoary, 

 and about >/^ of a line in size measuring in the same direction. 



