BRYOZOA—CRYPTOSTOMATA. 



151 



no. P. carinata (Hall.) {Glauconome carinata Yi&W.) (Fig. 206.) 



Devonic. 



Small, with broad central rachis, and alternating thin, short 



lateral branches; non-celluliferous face with three prominent carinae ; 



apertures circular, with comparatively 

 strong peristomes and prominent carinae 

 between the ranges. 



Hamilton of Western New York, etc. 



in. P. conferta Ulrich. (Fig. 205,/.) 



Mississippian. 



Central rachis, and branches more nearly 

 of the same width ; branches nearly op- 

 posite close-set; two ranges of close-set 

 pores on rachis and branches, separated 

 by low ridges. 



Keokuk of Iowa and Illinois. 



Fig. 206. Pinnatopora LXIII. PTILOPORA McCoy. 



carinata X 6. (After Hall Differs frQm the preceding in hav ; the 



and Simpson. ) . , . , ,. , 



stipe much stronger than the oblique lat- 

 eral branches, which are occasionally and irregularly united by 

 dissepiments. Dev.-Miss, 



112. P. striata Hall. Devonic. 

 Branches rigid, diverging at angles of 45 degrees, and separated 



by a space twice their width; dissepiments thin, irregular; aper- 

 tures in two ranges. 



Hamilton of Western New York and Ontario. 



113. P. cylindracea Ulrich. (Fig. 205, g.) Mississippian. 

 Differs from the preceding in having a row of hollow nodes and 



a median ridge on the rachis, and a similar row without the ridge 

 on the branches, and very thin, depressed, regular dissepiments. 

 Keokuk of Iowa and Kentucky. 



LXIV. Diploporaria Nickles and Bassler. 



Like Pinnatopora, but without the lateral branchlets. 

 Coal Meas. 



Miss.- 



114. D. bifurcata (Ulrich.) (Fig. 205, h.) Mississippian. 



Small, cylindrical stipes (0.3 mm. in diameter) bifurcating at 



