NO. 1442. JAMES TYPES OF BRYOZOA—BASSLER. 29 



Occurrence. — The James types were found in the Eden shales at 

 ]\Iilford, Ohio, but the variety occui's generally in abundance in the 

 Ohio Basin wherever the strata mentioned are exposed. 



CERAMOPORELLA WHITEI (James), 



Plate Y, tig. 6; plate VI, figs. 8-10. 



Ceramopora ivhitei James, Paleontologist No. 2, 1878, p. 12. 



Cemmopora ? w/u7fi James and James, Jour. Cincinnati Soc. Nat. Hist., XI, 1888, 



p. 38, pi. I, figs. 9, 9a. 

 Ceramoporella wldtei Nickles and Bassler, Bull. U. S. Geol. Surv., No. 173, 1900, 



p. 201. 



James recognized the relations of this species b}^ comparing it in his 

 original description with Nicholson's C. ohioensls^'' The description 

 and iigures given by James and James in 1888 are practicall}" worth- 

 less. The figure of the type agrees so little with the specimen itself 

 that were it not for the presence of three cracks traversing it, one could 

 not be certain of the identification. The view of the surface enlarged 

 is also incorrect, as a comparison with a photograph of the same on 

 Plate V will show. Fortunately the species has not been described 

 under any other name, so that James's specific designation may be 

 retained. 



The zoarium forms thin crusts over foreign bodies, but b}" the super- 

 position of numerous layers may become massive. Each zoarial layer 

 is short, rarely exceeding 1.5 mm. in thickness. Surface smooth, the 

 macuhe or clusters of rather thick-walled mesopores not being elevated. 

 Zooecia small, more or less angular, thin- walled and direct, about 

 7 in 2 mm. Mesopores generall}' few, sometimes absent altogether. 

 Lunarium occupying from one-fourth to one-third of the zooecial cir- 

 cumference, seldom overarching the zooecial cavity and always a more 

 or less inconspicuous feature of the surface. The internal structure 

 is essentially the same as in other species of the genus and is more 

 clearly brought out b}' the figures on Plate VI than would be possible 

 b}' description. 



As is the case in other species of the same section of Ceramoporella., 

 C, irhitel exhibits considerable variation. This consists principall}' of 

 (1) differences in the relative number and distribution of the meso- 

 pores even in different or adjoining parts of the same zoarium, (2) in 

 the degree in which the zooecia imbricate, and consequently (3) in the 

 degree of obliquity of the apertures, and (1) in the extent to which 

 the lunaria are developed in the zooecia occupying the macula?. How- 

 ever, the features presented by James's type are exhibited on at least 

 a portion of nearly ever}' one of several hundred specimens seen by 



the writer. 



• 



" Ceramopora okioensis Nicholson, Pal. Ohio, II, 1875, p. 265, pi. xxv, figs. 10 a, b, e 

 (notlOc, d,). 



