ROGERS : NEW BRYOZOANS. 11 



Se2>fojKH'(i htf/rjtoroftf. n. sp. Plate III, figs. 3, 3r^ 



Zoarium a small pinnate frond. Midrib straight, rather slender, 

 0.6 mm. wide, with a prominent subangular median carina, bearing 

 small nodes stationed at distances of 0.3 to 0.4 mm. apart. Lateral 

 branches also carinate, about one-half as wide as the midrib, sepa- 

 rated by interspaces a little more than their width apart, almost op- 

 posite on the two sides, five in 5 mm.; whole surface covered with 

 obscure longitudinal strici?. Apertures rather large, slightly oval, 

 separated by a space about equal to their diameter, nineteen in 5 

 mm. Between the ajjertures are situated accessory pores, which are 

 circular, with their diameter about equal to one-third the length of the 

 ajoertures. Dissepiments short, with from two to six apertures. Re- 

 verse not seen. 



Position and locality : Upper Coal Measures : Argentine, Kan. 

 Type in author's collection. 



Ditfers from S. p inn at a Ulrich, which it resembles, in having the 

 lateral branches straighter and more regular. The accessory pores 

 are much more frequent, there almost always being one between two 

 successive apertures. 



AcinitlKnIadia jn'intafa, n. sp. Plate III, figs. 4, 4«:/. 



Zoarium a pinnate frond; total size unknown. Primary branch 

 O.G to 0.7 mm. wide, giving ofip on each side five branches in 5 mm. 

 Pinnae 0.5 mm. wide ; length unknown ; some are at least 5 mm. long. 

 Obverse face, with two alternating rows of zoecia apertures on the 

 midrib, the space between which is occupied by small nodes jilaced 

 at irregular intervals. There are three or four ranges of apertures on 

 the pinnae. Apertures small, oval, with moderate peristomes, a little 

 more than their diameter apart. Surface where not worn covered 

 with small granules and fine longitudinal, undulating striae. Reverse 

 not seen. 



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

 Type in author's collection. 



A. fruticosa Ulrich has oval-shaped apertures, arranged in deep 

 furrows, and a more robust zoarium. 



HhoiiilHHhuUd , D. gen. 



Zoaria dichotomously dividing stems, poriferous on one side only. 

 Stems compressed, without lateral branches. Zoecial tubes very long, 

 with thin walls. Arising near the reverse side, they are first recum- 

 bent, then curve upward and meet the poriferous surface at an angle 

 of about 60 deg., increasing in size and the walls becoming thicker at 

 the same time. Primitive portions of the zoecia elongate suloquadrate 

 in outline. Apertures subellipticai, with ridge-like interspaces, ar- 

 ranged in several alternate longitudinal ranges ; also in diagonally in- 



