NO. 1H2. JAMES TYPES OF BRYOZOA—BASSLEni. 48 



angular mesopores. The latter often attain the size of the zooecia and, 

 especialh' in thin sections, may be mistaken for them. However, a 

 o-lance at the tabulation shown in vertical sections will distinguish the 

 two, the mesopores being' closely tabulated and the /(xecia having no 

 diaphi'agins at all. In tangential sections the outer side of the walls of 

 the zooM'ia are always more or less convex, whil<» th<^ sides of the 

 mesopores are correspondingly concave. Acanthopores small and 

 usually inconspicuous both at the surface and in sections. 



The small, unbranched, club-shaped zoarium with thin-walled poly- 

 gonal zocecia separated by more or less numerous mesopores, causes 

 the separation of this species from associated bryozoa to be quite easy. 

 Comparison with the related form L. fustforjulx ivon\ the Richmond 

 group of Wisconsin is given above. 



Occnrrence. — Quite abundant in the Wajmesville formation of the 

 Richmond at a num))er of localities in Ohio and Indiana. The James 

 ty])es were found at Westboi'o, Ohio. 



MONOTRYPA UNDULATA var. HEMISPHERICA (J.F.James). 



Moiilirulipord [Mutiolrypa) nndidafd (part) Nicholson, (lenus Monticulipora, 



1881, p. 170, fig. :«r;-r. 

 McnticuUpom undulata var. lu'miq)heriai .T. F. James, .Tour. Cincinnati Soc. Nat. 



Hist., XV, 1893, p. 157, figs. lOa-c 

 Monotrypa undulata-hemispherira l^K'KLRi^ and Basslek, Bnll. V. S. Geol. Surv., 



No. 178, 1900, p. 317. 



This variety is founded upon Nicholson's description and figures" of 

 what he regarded as a ""rounded or irregularly sphteroidaP' form of 

 his ^[onotrypa unduJatn. There are no specimens of this variety in 

 the flames collection, nor is it known that either the species or vari- 

 ety occur in the vicinity of Cincinnati. If James's subordinate name, 

 which is a misnomer, the form being subglobular and not hemispheric, 

 is to be recognized, it must rest upon the Canadian types in Nichol- 

 son's collection. Until these or other authentic examples are again 

 studied, the status of the name can not be definitely determined. It 

 may be remarked, however, that this supposed subglobular variety of 

 M. undulata must be very near, if indeed not identical, with Illrich's 

 M. Kul)gloI)o.m . 



Occurrence. — Nicholson's specimens are said to comc^ from tne 

 Hudson River group in Ontario, Canada. 



MONTICULIPORA CINCINNATIENSIS (James). 



Chidetes cinrinnatiensi^ J AMES, Catal. Sil. Foss., Cincinnati group, 1875, p. 2. 

 Monticulipora cincinnatiensiif James and James, Jour. Cincinnati Soc. Nat. Hist., 



X, 1888, p. 170.— J. F. James, Jour. Cincinnati Soc. Nat. Hist., XVI, 1894, 



p. 188. 

 Moi)ti(mlipor<( {Perdnopora) cin,c/TO*-rt<ien.sis' Nicholson, Genus Monticulipora, 1881, 



p. 226, pi. II, figs. 6-6c. 



"Genus Monticulipora, 1881, p. 170. 



