ralcontology of the Cincinnati Group. 91 



Remarks. — This species differs markedly from both the 

 foregoing. It is a parasitic form, growing on various species 

 of brachipoda and corals. The outer surface shows both 

 large and small pores. 



4. — S. SCAUKA, U. P. James, 1S79. 



Coenosteum a thin crust on foreign bodies, (shells or corals), 

 one line or less thick, made up, apparently, of very thin 

 laminae; surface marked with prominent, conical or elongated 

 monticules, Yz line to a line high, and from one to two lines 

 apart ; entire surface covered with closely set papilhe, gen- 

 erally with small, circular openings at the apex ; varying in 

 size from one to two inches square. (The Paleontologist, No. 

 3, Jan. 15, 1879, p. 18.) 



Locality. — Cincinnati, Lebanon, Blanchester, etc., O. 



Remarks. — Resembles the preceding, {licJienoides), in being 

 parasitic, but differs in its prominent monticules, and the 

 presence of papilke between them. In this respect it re- 

 sembles the species that follows, ])ut that one is without any 

 monticules. 



5. — vS. PAPiLLATA, U. P. James, 1S78. 



Co^no.steum a thin crust on corals, shells, etc.; outer surface 

 with small, closely set, prominent papillae or tubercles, giving 

 a granular appearance ; papillae with or without circular 

 openings at the apices ; 6 to 8 papillae in one line, the inter- 

 spaces non-poriferous. (The Paleontologist, No. i, July 7, 

 1878, p. I.) 



Locality. — Cincinnati, Lebanon, Blanchester, etc., Ohio. 



Remarks. — As noted in the remarks on the previous species, 

 this one differs mainly in having no monticules. 



6. — S. LUDLOWKNSis, U. P. James, 1884. 



Ccjcnosteum varying in outline and in size; 4 /^ by 3 inches, 

 and 2^2 inches thick; sometimes parasitic, and then varying 

 from yV to ^ of an inch thick ; laminae irregular, undulating, 

 from 4 to 6 in yV of an inch, including interspaces; transverse 

 sections show numerous circular or oval oscula (?) irregularly 



