236 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Hincks placed this genus in the Notamiidae with Synnotum. It 

 constitutes, however, a very divergent ensemble in the form of zooecia 

 and in the nature of the gonoecia. The larva is not known. Notomia 

 Fleming, 1828 being replaced by Epistomia, it was necessary to 

 replace Notamiidae by Epistomiidae. 



Genus SYNNOTUM Hincks, 1886 



(Alteration of Synnota, Pieper, 1881) 



The zooecia are in pairs back to back, each pair connected by 

 tubular prolongations with the next pair but one below it. There 



Fig. 97. — Genus Stolonella Hincks, 1883 



Slolonella clausa Hincks, 1883. The colony is attached by a radical fiber 

 which issues from a creeping stolon. The zooecia which issue separately from 

 the stolon are furnished with two rows of spines, joined together in pairs and 

 separated by a single row of transverse slits. No avicularia. No ovicell. 



are sessile lateral avicularia and an articulated avicularium between 

 the cells in each pair at the summit. 



Genotype. — Synnotum (Gemellaria) avicularia Pieper, 1881. Recent. 



Suborder ASCOPHORA Levinsen, 1909 



THE COSTULAE 



Family CRIBRILINIDAE Hincks, 1880 



We have treated this family and its genera at some length in our 

 Monograph of North American Early Tertiary Bryozoa. In the 

 following pages we are adding descriptions of genera not discussed in 

 1920, but we are not taking into account the many genera and fami- 

 lies proposed in recent years by Lang. 



