﻿ULRICH-BASSLER] revision of paleozoic BRYOZOA 1/ 



the maculae generall) inconspicuous, but, where composed of m» 

 pores only, quite distinct and slightly elevated. Zooecia small, an 

 gular, with rather thick, minutel} granulose walls, 8 to 9 in 2 mm. 

 Mesopores ver) few and generally restricted to the maculae. Acan- 

 thopores small and usuall) not showing at the surface; nor can they 

 be readily distinguished in tangential sections from the granulose 

 wall structure. Cystiphragms in a compact series in the peripheral 

 region, about 3 in a distance equaling the diameter of a tube, while 

 in the axial portion they are large and more infrequent, here varying 

 from once to twice a tube diameter apart. Walls very thin in the 

 axial region but becoming considerably thickened and apparently 

 firsl developing their granulose character in the peripheral zone. 



The only described species with which this need he compared is 

 .1/. arborea Ulrich, a similarly ramose Monticulipora from the 

 Trenton of Minnesota and Kentucky. Although agreeing closely in 

 many respects, the absence of monticules and the smaller and less 

 numerous acanthopores distinguish .1/. cleavelandi from the Trenton 

 form. The occurrence of cystiphragms in both the axial and periph- 

 eral regions in M . cleavelandi distinguishes it from all associated 

 Richmond bryozoans having a ramose mode of growth. 



This species was supposed by us to be new, but just before this 

 article went to press, Mr. Bassler obtained the loan of the James' 

 types of Bryozoa from the University of Chicago and discovered the 

 identity of our form with James' M. cleavelandi. Judging from the 

 various descriptions of M. cleavelandi, one would never suspect that 

 James' species and the form here described were based on the same 

 species. 



Occurrence. — James' types are from Lynchburg, Ohio. The spe- 

 cies is very abundant in the middle division of the Richmond at 

 Dutch creek, <\ l / 2 miles northwest of Wilmington, Ohio, and at 

 Cowan's creek, 7 miles southwest of the same place. 



Cat. Nos. 43,170. 43,171, U. S. N. M. 



MONTICULIPORA EPIDERMATA new species 



(Not figured) 



Chatetes mammulatus Qoenstedt (not Monticulipora mammulata 

 D'Orbigny), Roehren und Sternkorallen. [88l, p. 75, pi. cxlvi, figs. 



10, 11 (not 12). 



This species is so abundant and characteristic of the middle Rich- 

 mond of Ohio and Indiana and also so easily recognized by the ex- 

 ternal characters which are clearly shown in Quenstedt's figures (loc. 

 cit.) that we think it desirable to describe its internal characters. 



