20 PROCEEDINGS OF THE NATIONAL MUSEUM. 



described" very old examples under the name Pfilod'ictyaf aj'ctipora. 

 This determination was quite unexpected since in their revision of the 

 Monticuliporoids James and James, who might be expected to know 

 the facts in the case and therefore were followed by Nickles and the 

 writer,^ place C. minutus as a sj^nonym of Montlcullpora (now Bytho- 

 pora) delicatula (Nicholson).'' 



Occurrence. — Byihopora arctipora is a characteristic and very abun- 

 dant fossil of all the divisions of the Eden shale in the Ohio basin. 

 The types of C. 'minutus were found near Loveland, Clermont Countv, 

 Ohio.' 



BYTHOPORA DENDRINA (James). 



Ilelopora dendrina JASiEt^, Paleontologist, No. 1, 1S7S, p. 3 (July 2, 1878); No. 2, 



p. 14. 

 Bjithopora dendrina Nickles and Basslek, Bnll. U. S. Geol. 8urv., No. 173, 1900, 



p. 185. 

 Biithopvrafruticomt Miller and Dyer, Contr. to Pal., No. 2, 1878, p. 6. pi. iv, 



tigs. 6, 6a (July 22, 1878). 



The type of Tleloponi dendrina does not belong- to the James collec- 

 tion and the following remarks are introduced here only to indicate 

 the rather unusual history of the species. As indicated in the above 

 synon^'mv, James's species antedates B.frutlcom by only twenty days, 

 but both names seem to be founded upon the same specimen. The 

 specimen described by James was an unusually fine zoarium found by 

 Mr. Charles Schuchert. wdio, after James's description had been writ- 

 ten, disposed of it to Mr. C. B. Dyer. The type of B. frutlcom came 

 from Mr. Dyer's collection, and apparently is the same specimen as 

 that found by Mr. Schuchert, the result being that the two names have 

 not only been founded upon the same species, but probably also upon 

 the same specimen. 



B. dendrina may be distinguished from other species of Bythopora 

 hy its frequently branching, slender stems; elames's description brings 

 out the superficial characters even though unaccompanied by illustra- 

 tion. 



Occurrence. — Fairview formation, Cincinnati, Ohio, and vicinity. 



BYTHOPORA GRACILIS (Nicholson.) 



Cliaeteks gracilis James, Catal. Low. Sil. Foss. Cincinnati (iroup, 1871, \^. 3 



(named only). 

 Chaetetes f/rac His 'i^wnoLsoy, Quar. Jour. Geol. Soc. London, XXX, 1874, p. 504, 



pi. xxi.x, figs. 7, 7a; Geol. Surv. Ohio, Pal., II, 1875, p. 198, pi. .x.xi, figs. 



8, 8b. 

 Moittlcntlpora {Heterotrypa) (jrarlUs Nicholsox, Cienus Monticulij)ora, 1881, p. 



125, pi. II, figs. 1-lb, and tig. 20. 



«Geol. Surv. Ohio, Pal., II, 1875, p. 262. 

 '•Bull. r. 8. Geological Survey, No. 173, 1900, p. 184. 



•CJiaetetrs ddlrdtnlus Nicholson, Quart. Jour. Geol. Soc. London, XXX, 1874, 

 p. 505, pi. XXIX, figs. 8-8b. 



