ART. 22. CYCLOSTOMATOUS BRYOZOA — CANU AND BASSLER. 113 



Structure. — The internal structure of this species is described and 

 illustrated in detail in our volume on the Later Tertiary and Qua- 

 ternarj' Bryozoa of North America now in press. The ovicell, lo- 

 cated at the end of the branch, is not very salient. It is hollowed 

 out of the zoarium itself, as is easy to verify in the sections. 



Affinities. — Our species is almost identical with Entalo'phora capi- 

 tata Robertson, of whose variations we are ignorant. It differs 

 from it in its ovicell, which completely covers the end of the branch, 

 and in the smaller micrometric dimensions (if the enlargement indi- 

 cated on Miss Robertson's figures is exact). 



Occurrence. — Pleistocene: Santa Barbara (very common) and 

 Dead Mans Island (rare), California. 



Cotypes.—Q^t. No. 68959, U.S.N.M. 



Family ASCOSOECIIDAE Canu, 1919. 



1919. Ascosoeciidae Canu, Iiltudes sur les Ovicelles des Bryozoaires Cyclo- 

 stomes (2), Bulletin Soclete Geologique de France, ser. 4, vol. 17, p. 336. 



The ovicell is a large, elliptical, elongate swelling, quite salient 

 and perforated by the tubes; often a median oeciopore is present. 



In addition to the genus Ascosoecia, Parascosoecia, and Polyasco- 

 soecia described under this family in our monograph of 1920, we 

 are now able to refer the following genera to it: Sulcocava D'Or- 

 bigny, 1850; FilicHsina D'Orbigny, 1852; CavarineUa Marsson, 1884, 

 and the new genera Grammascosoecia and Granwianotosoecia. 



The Ascosoeciidae and Cytisidae are perhaps the two principal 

 families of Cretaceous cyclostomatous bryozoa, as the seas of that 

 time abounded in their species. The Cytisidae is entirely extinct, 

 while the Ascosoeciidae existed, greatly diminished, during the Ceno- 

 zoic and are rarely found in recent seas. 



KEY FOR DETERMINATION OF GENKKA OF ASCOSOECIIDAE. 



{Gemmation triparietal 2. 

 Gemmation biparietal 4. 



I Median lamella Grammascosoecia. 



' I No median lamella 3. 



(Vacuoles on the dorsal; mesopores on the frontal Polyascosoecia. 

 No frontal mesopores. The walls of the tubes are very thick at their ex- 

 tremities Crisina. 



( Tubes cylindrical 5. 



■ I Tubes conical 6. 



f ISIesopores only Ascosoecia. 



\ Mesopores and vacuoles Reteporidea. 



( No mesopores, Sulci present Sulcocava. 



] Mesopores regular (parietal) Parascosoecia. 



r dorsal dactylethrae Filicrisina. 



7. No mesopores jpenpheral sulci Sulcocava. 



