ROGERS : NEW BRYOZOANS. 9 



Position and locality : Tipper Coal Measures ; Lawrence and Le- 

 compton, Kan., and Kansas City, Mo. Type in author's collection. 



This species is intermediate between P. suhmarginata Meek and 

 P. distincta Ulrich in several respects. From the former it differs in 

 the more elongate form of the fenestrules, the branches are subtri- 

 angular rather than subpentagonal in cross-section, the reverse side 

 bears a row of nodes, the arrangement of the apertures is quite regular. 

 From the latter it may be distinguished by the less elongate fenes- 

 trules and by the presence of nodes on the reverse side. 



Some of the measurements agree well with those of P. crassa 

 Ulrich, but the apertures of that species are closer together, the 

 peristomes are complete, and the branches are wider. 



ThainniscHs teiiniraniHS, n, sp. Plate II, figs. 5-5 a. 



Zoarium a small frond, composed of slender branches, bifurcating 

 at intervals of about 4 mm. Angle of bifurcation between 40 deg. and 

 60 deg. Branches quite convex on the obverse side, less so on the re- 

 verse side ; 0.55 mm. wide and 0.45 mm. thick. Lateral margins of the 

 branches subangular ; also dentate, due to the lateral projection of the 

 marginal ranges of zoecia apertures. No dissepiments present. Zoe- 

 cia in four or five alternate ranges, these being the extremes between 

 the bifurcations. Apertures small, circular, about twice their diame- 

 ter apart, occupying the summits of transverse ridges, which increase 

 in height toward the margins of the branches. The transverse spaces 

 between the a^jertures are somewhat depressed, giving a pustulose ap- 

 pearance to the zoecia mouths. Eighteen apertures occur in a space 

 of 5 mm. 



Position and locality : Upper Coal Measures ; Kan.sas City, Mo., 

 and Lawrence, Kan. Type in author's collection. 



In some respects resembles T. divaricans Ulrich, from the Keokuk 

 group, but the transverse ridges of that species are more prominent 

 and the zoarium is much more robust. T. sevillensis Ulrich and T. 

 octoriarius Ulrich, from the Coal Measures, are quite distinct. 



ACANTHOCLADIID.E Zittel. 

 Piunatopovd ittfriforiHiftora. n. sp. Plate II, figs. 6, 6a. 

 Zoarium a pinnate frond. Midrib slightly flexuous, 0.5 mm. wide, 

 giving off on each side seven lateral branches in a space of 5 mm. 

 Pinnpe rather short, two-thirds as wide as the branches, given off al- 

 ternately. Obverse face with a prominent flexuous carina, bearing a 

 row of very small nodes 0.4 mm. apart. Zoecia in two alternating 

 rows. Apertures small, elevated, pyriform, with small end pointing 

 towards the base of the frond, about twice their diameter apart, 

 eighteen in 5 mm. The apertures are arranged so that one is at the 



