10 KANSAS UNIVERSITY QUARTERLY. 



smaller angle of the junction of the pinna with the branch and two in 

 the space between. 



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

 Type in author's collection. 



Distinguished from all other species of the genus by the form of 

 the zoecial apertures. 



Pimifffopora jttifojtoroHJea, n. sp. Plate III, fig. 1. 



Description of reverse side : Zoarium a pinnate frond. Midrib 

 straight but slightly convex; surface apparently smooth, 0.45 mm. 

 wide. Branches rather slender, 0.25 mm. to 0.3 mm. wide, given off 

 alternately at an angle of about 65 deg., six in 5 mm.; total length of 

 branches unknown, the longest measuring 4 mm., not appreciably di- 

 minishing in thickness in this distance. Branches connected by non- 

 poriferous dissepiments. Fenestrules subquadrangular, about as wide 

 as the branches, length varying from 1 to 2.5 mm. 



The obverse side of a specimen, probably of this species, has been 

 observed, but in such poor preservation as not to warrant a descrij)tion 



Position and locality: Upi^er Coal Measures; Lawrence, Kan. 

 Tyi^e in author's collection. 



Resembles P. intermedia Ulrich and P. simulairix Ulrich, from 

 the Waverly group, of Ohio, in having the lateral branches connected 

 by dissepiments, but has the branches nearer together. From the 

 latter it differs in having the midrib and the branches nearer equal in 

 width. As the general appearance of the zoarium is much like that 

 of Plnnatopora, it is referred to that genus. 



I*hnu(topoi'(f iittilfijtora,- n. sp. Plate III, figs. 2, 2a. 



Zoarium a rather large pinnate frond. Midrib straight, 0.5 mm. 

 wide, giving off on each side four branches in 5 mm. Pinnae long and 

 slender, about 0.3 mm. wide, given off subalternately, at an angle of 

 about 75 deg. Zoecia in two alternating rows. Apertures small, sub- 

 circular, about their diameter ajoart, seventeen in 5 mm. One aper- 

 ture occurs at the small angle of the pinnae with the midrib, and five 

 in the space between. Reverse face covered with fine longitudinal 

 striae and circular pores, with moderately well defined peristomes. 

 Obverse face not seen. 



Position and locality : Upper Coal Measures ; Eudora, Douglas 

 county, Kansas. Type in author's collection. 



Of other species occurring in the Coal Measures, it most nearly re- 

 sembles jP. trilineata Meek, differing from it mainly in having five 

 apertures instead of two in the space between the apertures, occur- 

 ring at the junction of the pinnae with the midrib. 



