124 PROCEEDIInTGS of the national museum. vol.61. 



structure. — The mesopores are distributed irregularly over the 

 zoarial surface. The orifices are similarly distributed, and often 

 their ensemble affects the aspect of Zonopora. 



The fronds being twisted, it is very difficult to obtain good longi- 

 tudinal sections. Moreover, our specimens are so highly calcified 

 that we have not been able to make the sections thin enough for good 

 photograpliy. Nevertheless we have been able to verify that the 

 tubes were cylindrical and that the gemmation was dorsal. The 

 median lamella is thin and fragile. 



In transverse section the tubes everywhere have the same diameter, 

 showing that they are cylindrical. The small tubes adjacent to the 

 median line being much smaller, reveal the dorsal gemmation. The 

 median lamella is very thin and rectilinear. 



Occurrence. — Cretaceous (Santonian) : St. Bonnier and Deviat 

 (Charente), France. 



Cretaceous (Campanian) : Gaineau, Brossac, Montmoreau, Maud, 

 Saint Medard, Saint Aulais and Salles (Charente), France. 



Cotypes.—C2.nM collection and Cat. No. 68968, U.S.N.M. 



Genus POLYASCOSOECIA Canu and Bassler, 1920. 



1920. Polyascosoecia Canu and Basslek, North American Early Tertiary 

 Bryozoa, Bull. 106 U. S. National Museum, p. 837. 

 The ovicell is globular, salient, spread between the fascicles whose 

 length it augments, placed eccentrically on the frontal. The tubes 

 are cylindrical, oriented, short, with triparietal gemmation; they 

 ramify into numerous mesopores or vacuoles on the frontal. The 

 dorsal of the zoarium is thick, with lamellar structure, and per- 

 forated by vacuoles bent toward the base. 



Genotype. — Polyascosoecia coronopus^ new species. 

 Range. — Jacksonian-Plaisancian. 



This genus differs from Plcuronea, in which the ovicell is placed 

 identically, not only in the different nature of the ovicell, but in its 

 cylindrical tubes. It differs from the genus Erkosonea, equally pro- 

 vided with pores on the two faces of the zoarium, in its ovicell 

 placed laterally, and in its short cylindrical tubes, with triparietal 

 gemmation. 



The known species belonging to this genus are as follows: 

 Polyascosoecia coronopus^ new species. Helvetian. 

 Polyascosoecia jachsonica Canu and Bassler. Jacksonian. 

 Polyascosoecia inibricata Canu and Bassler. Jacksonian. 

 Polyascosoecia (Hornera) sparsa Reuss, 1864. Latdorfian. 

 Polyascosoecia (Cnsina) foramin^sa Eeuss, 1865. Rupelian 



(Stampian). 

 Polyascosoecia {Orisina) canaliculata Eeuss, 1865. Rupelian 

 (Stampian). 



