212 SYSTEMATIC PALEONTOLOGY 



The specific name is in honor of the late Professor William Bullock 

 Clark in appreciation of his work upon fossil echinoderm's. 



Occurrence. MAKTIXSBUEG SHALE (Eden division). Jordans Knob, 

 one and one-half miles northeast of Fort Loudon, Pennsylvania. 



Collection. U. S. National Museum. 



MOLLUSCOIDEA 



CLASS BRYOZOA 

 order CYCLOSTOMATA 



Family DIASTOPORIDAE 

 Genus GORYNOTRYPA Bassler 



COKYXOTRYPA INFLATA (Hall) 



Plate XLVII, Figs. 15-17 



Alecto inflata Hall, 1847, Pal. New York, vol. i, p. 77, pi. xxvi, figs. 7a, b. 

 Stomatopora inflata Ulrich, 1893, Geol. Minnesota, vol. iii, p. 117, pi. i, 



figs. 13-21. 

 Uorynotrypa inflata Bassler, 1911, Proc. U. S. Nat. Mus., vol. xxxix, p. 515, 



text figs. 12-14. 



Description. " Zocecia resembling those of Hippothoa, short and wide, 

 pyriform, the proximal end contracted and springing from the under side 

 of the anterior end of the cell beneath ; eight or nine in 5 mm. Apertures 

 circular, direct, with a peristome, about 0.09 mm. in diameter, situated 

 near the anterior end. Mural perforations minute and but rarely 

 preserved. 



" In the Trenton or typical form of this species the zooecia, as a rule, 

 are less swollen and the adnate zoarium divides less frequently than in 

 the better known Cincinnati form. In the latter, therefore, the network 

 is closer, and occasionally the growth is so luxuriant that the rows cross 

 each other to such an extent that but little space is left between the cells. 

 No distinction, however, can be based upon these characters since, when 

 good series of specimens are studied, it is found that among those from 



