2 KANSAS UNIVERSITY QUARTERLY. 



occupied by apertures a little larger than the average. Zoecial aper- 

 tures angular to subangular, with thin walls, six in 2 mm. Strong 

 acanthopores at the cell angles. Numerous very small acanthopores 

 occur along the cell walls. Often strong acanthopores are found here, 

 too. Internal characters unknown. 



Position and locality : Upper Coal Measures ; Melvern, Osage 

 county, Kansas. Collected by Judge E. P. West. Type in the Uni- 

 versity of Kansas Museum. 



This species is very similar to aS. ohioensis Foerste. The strong 

 acanthopores are more numerous and there is a greater contrast be- 

 tween the large and the small acanthopores. There are six instead of 

 ten apertures in a space of 2 mm. It may be a well-marked variety 

 of S. ohioensis, but it is believed that these differences, together with 

 the zoarial characters and the montiferous surface, justify its inde- 

 pendent existence as a distinct species. 



St('H<ti>or(i splssa, n. sp. Plate IV, figs, i-ih, 



Zoarium a cylindrical, dichotomously dividing stem, varying from 

 4 to 8 mm. in diameter. Surface smooth, not montiferous. Zoecial 

 apertures subcircular, with rather thick interspaces, about six occur- 

 ring in 2 mm. Zoecial tubes thin and polygonal in the immature 

 region, making an abrupt bend to the surface, where the walls are 

 greatly thickened. Walls not distinctly moniliform, but often an 

 elongated swelling is noticed just after the walls enter the mature 

 region. Diaphragms apparently absent. Acanthopores small, very 

 numerous, all the same size, usually with two rows on the cell walls. 



Position and locality : Near the summit of the Upper Coal Meas- 

 ures; Howard, Elk county, Kansas. Collected by Mr. Carmine Ross. 

 Type in University of Kansas Museum. 



Resembles S. ohioensis Foerste, but the acanthopores at the cell 

 angles are no more jjrominent than those on the cell walls. Of inter- 

 nal characters, the thickened zoecial walls in the mature region and 

 the absence of diaphragms distinguish it from that species. 



CYSTODICTYONID.E Ulrich. 

 Cf/stodifff/a ineqtiimarf/hiatff, n. sp. Plate I, figs. 2-2h. 

 Zoarium a long stipe, dichotomously dividing at frequent intervals. 

 Branches acuminate-ovate or subcircular in cross section, about 1 mm. 

 wide and 0.75 mm. thick. Non-poriferous margin narrow and sharp 

 on one side; rather wide and rounded on the other. Zoecial aper- 

 tures much elevated in unworn specimens, small, subcircular, sepa- 

 rated longitudinally by about twice their diameter ; arranged in three 

 or four linear series. In a space of 3 mm. six apertures occur in the 

 row nearest the wider margin, while eight occur in the same distance 

 in the row nearest the narrow margin. Apertures also quite regularly 



