NO. 1442. 



JAMES TYPES OF BRYOZOA-BASSLER. 35 



Experience shows that this is true, especially in species of DeUydla 

 and related g-enera of the Heterotrypldm. Nicholson figured branches 

 of his species with a smooth surface, but every A^ariation from this to 

 sharply monticulated examples may be found. Foord« described this 

 sharply monticulated form as Bel'ayella rohmta and Nickles.and the 

 writer, in their Synopsis, recognized his species as a variety of 1). 

 ulrldd, with James\s name as a synonym. For the reasons mentioned, 

 I), rolmsta is now regarded as not even of varietal importance. 

 ^ Occwrrence.—K characteristic and exceedingly common fossil in the 

 Eden shale of most localities in the Ohio basin. The types of M. 

 idrlcki, and also of M. oMoensis and IJ. robmta came from' Cincinnati' 

 Ohio. ' 



DEKAYIA MACULATA James. 



Plate II, figs. 18, 14. 



Dekayla maculata James, Paleontologist, No. 5, 1881, p. 36. 

 Montlculipora {Dekayla) maculata J. F. James, Jour.' Cincinnati Soc Nat Hist 

 XVIII, 1896, p. 116, fig. 11. 



This is one of the best marked species of the genus Dekayla and 

 may easily be recognized from the figures published by J. F. James 

 in I8i)6 (after an unpu))lished plate by Ulrich). The study of many 

 specimens of this species has indicated that its principal specific charac- 

 ter is not, as stated by both the elder and younger James, the presence 

 of macuhe composed of mesopores alone. James's two type specimens, 

 it is true, show such macular in a marked degree, but in many other 

 examples from the same bed and locality, otherwise indistinguishable, 

 the macula? are composed only of zocjecia larger than the average, and 

 with other specimens every gradation between the two may be estab- 

 lished. J. F. James states in his description (1896), " walls of coral- 

 lites thin, internal structure unknown," and yet gives at the beginning 

 of this saine description, figures showing all of the internal characters, 

 and particularly the unusually great peripheral thickening of the 

 walls. This latter feature is the specific character which will readily 

 separate D. maoilata from other species of the genus. 



The ramose zoarium, thick zooecial walls, conspicuous acanthopores, 

 few and delicate diaphragms and practical absence of mesopores 

 together with the size of the zooecia— 8 in 2 mm.— form a combination 

 of characters which will readily separate I), maculata from all asso- 

 ciated l)ryozoa. Views illustrating the structure and thickness of the 

 walls, the distribution of acanthopores, mesopores, and diaphi-agms, 

 and other internal features are given on Plate II. 



Occurre7ice.~(^mtQ an abundant and characteristic fossil of the 

 McMicken member cif the Eden at Cincinnati and vicinitv. James's 

 types were from Loveland, Ohio. 



«Ann. Mag. Nat. Hist (5), XIII, 1884, p. 341. 



