22 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



branches of B. meeki are seldom less than 6 or 7 ram. in diameter, and 

 occur only in the Waynesville formation of the Richmond group. 



Occurrence. — Waynesville formation, Richmond group, at most local- 

 ities in the Ohio Basin. James's types were from Clinton and Warren 

 counties, Ohio. 



BYTHOPORA PARVULA (James). 



Plate III, figs. 11, 12; plate V, fig. 4. 



Helopora pannda James, Paleontologist, No. 1, 1878, p. 3. 



Bythopora parvula Nickleis and Bassler, Bull. U. S. Geol. Surv., No. 173, 1900, 

 p. 186. 



The types of Helopora parvula are from the upper part of the Eden 

 shale, and prove to represent a form of Bythoporii quite distinct from 

 other species of this genus. The following description and compari- 

 son bring out its essential features. 



Zoarium consisting of very slender cylindrical branches seldom 

 exceeding 0.4 mm. in diameter, dividing at irregular but rather long 

 intervals and bearing -i or 5 rows of elongate oval zocecia rounded 

 behind and drawn out in front, separated from each other longitudi- 

 nally by spaces equal to their longer diameter. Measuring length- 

 wise about 5 zooecia in 2 mm. Narrow, channeled interspaces sepa- 

 rate the rows of zooecia. Mesopores and acanthopores obsolete or 

 apparently wanting. Diaphragms sparingly developed. 



In its internal characters the species simulates Xematopora., but the 

 pi'oportionally much greater length of the zooecial tubes is regarded 

 as indicating the trepostomatous genus Bythopora rather than the 

 Cryptostomata. 



Compared with other species of Bythojjora., the present form may 

 be easily distinguished by its extremely slender branches and widely 

 separated zotecial apertures. The associated B. airtipoiut has broader 

 branches and more closely set zo(jecia and well developed acanthopores 

 in greater or less abundance. 



Occurrence. — McMicken member of Eden shale, Loveland, Ohio. 



CALLOPORA MULTITABULATA (Ulrich). 

 Plate 1, figs. 5-7. 



Moniiculipora kentuckensis James, Paleontologist, No. 7, 1883, ji. .57, pi. ii, figs. 



1-U. 

 Monticulipora kentuckensis J .\mb» and James, Jour. Cincinnati Soc. Nat. Hist., X, 



1888, p. 180, pi. II, figs. Ha-'/.— J. F. James, Jour. Cincinnati Soc. Nat. Hist, 



XVI, 1894, p. 203. 

 Monotnjpella mnUltabulata Ulkkm, Fourteenth Ann. Rep. Geol. Nat. Hist. Surv. 



Minnesota, 1886, p. 100. 

 Callopora mnltitubulata Ulrich, Geol. and Nat. Hist. Surv. ^Minnesota, Final 



Kept, III, Pt. 1, 1893, p. 280, pi. xxiii, figs. 11, 12, 16. 17, 24-26, 30, 31. 



Mmiticulipora Jcejitxtchemis eTames could certainly never be recog- 

 nized from an}' of the descriptions or figures given b}' its author. 



