174 KANSAS UNIVERSITY QUARTERLY. 



appearance. Apertures arranged in quite regular longitudinal, 

 transverse and diagonally intersecting series. It requires about 

 ten or twelve rows to encircle the stem. Measuring longitud- 

 inally, two apertures occur in a space of 1 mm. ; diagonally, 

 three in 1 mm. The interspaces are comparatively narrow, 

 and a small acanthopore is placed at their junction angles. 

 The zoecial tubes arise from a central axial tube and approach 

 the surface gradually, so that the apertures, especially in 

 slightly worn specimens, are deeper at the posterior end than 

 at the anterior end. An occasional diaphragm is observed in 

 both the central tube and the zoecial tubes. 



Position and locality : Upper Coal Measures ; Lower Oread 

 limestone at Lawrence, Kan., associated with the following 

 species of bryozoans : Fisttih'pora nodulifera Meek, Rhomhopora 

 lepidodendroidea Meek, Strcbloirypa ulricJii^' Rogers, S. ^triat- 

 opora* Rogers, Cystodictya inequimargi)iata* Rogers, Fenestella 

 Jean sa sen sis* Rogers, F. limhata Foerste, F. reniota Foerste, F. 

 shumardi Prout, Poh/pora ell i plica* Rogers, P. //(^.ruo-sa/* Rog- 

 ers, P. suhmarginata Meek, P. iriarxjularis* Rogers, Thainniscus 

 tenuiramus* Rogers, Pinnatopora ptiloporoidea* Rogers, P. tri- 

 lineata Meek, P. whilii Foerste, Septopora biserialis Swallow, 

 Rhomhocladia delicata* Rogers, and an undescribed species of a 

 new genus belonging to the Phylloporinidpe. Also found in the 

 loia limestone at Kansas City, Mo., and at the summit of the 

 Upper Coal Measures in the Cottonwood Falls limestone at 

 Cottonwood Falls, Kan. Type in the author's collection. 



Our species differs from R. gracile Phill. in the shape of 

 the apertures, in the number and distribution of acanthopores, 

 and in having a fewer number of apertures which occur in a 

 given space. This species bears a strong resemblance to some 

 species of Rhomhopora, and it is almost impossible to iden- 

 tify it by external characters. Thin sections, always valuable 

 adjuncts in the study of any fossil bryozoans, are here neces- 

 sary. Small ramose forms, with thin interspaces and with the 

 zoecial tubes approaching the surface gradually (very notice- 

 able in worn specimens) are apt to belong to this species, and 

 may be further studied by means of thin sections. 



Univeesity of Kansas, Lawrence, May 31, 1900. 



*The starred species were described by the author in the Kansas University 

 Quarterly, vol. IX, pp. 1 12, pis. i-iv, 1900, series A. 



