NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 687 



there may be as many as 3 to an internode. In the narrower internodes 

 they may be as simple as those of Crista (though more embedded), with 

 a terminal ooeciostome which is smaller than a peristome and may 

 terminate simply, or the rim may be expanded and slightly bell-shaped, 

 the pore round. On broader internodes the ovicells are more expanded 

 laterally and sometimes extend beyond the ooeciostome, and occasionally 

 a few of the neighboring peristomes are surrounded. 



". . . at low tide almost anywhere on the coast of Southern California. 

 ... It has been dredged ofif the coast, from San Pedro to San Diego in 

 depths ranging from 2 to 17 fathoms." (Robertson). Okada has re- 

 corded the species from the Bay of Sagami, Japan, and Marcus reports 

 it from Santos Bay, Brazil. 



Hancock Stations: Dredged at 28 stations, all the way from Point 

 Conception, California to Peru. Station 844-38, Lobos de Afuera 

 Islands, Peru, 6°55'40"S, 80°43'50"W, shore to 30 fms, the most 

 southerly record; 31-33, Hood Island, Galapagos, 1°22'52''S, 89°39' 

 15"W, at 4 fms; 308, Bahia Honda, Panama; Clarion Island, west of 

 Mexico ; 7 stations in the Gulf of California ; Dewey Channel west of 

 Lower California; and abundant about the Channel Islands off southern 

 California as well as along shore; from low tide mark to a depth of 

 47 fms. 



Division 3. Gancellata Gregory, 1896 



(Pachystega Borg, 1926) 



The Horneras etc. 



The primary zoid is erect but not separated from the ancestral disc 

 by a joint; the zoarium is not jointed, erect, usually branched like a 

 tree. The "wall of zoarium double, consisting of a gymnocyst and cryp- 

 tocyst, the latter undergoing a process of secondary calcification, by 

 which the zoarium in its older parts becomes very strongly calcified." 

 (Borg, 1944:175). The ovicell or brood-chamber is a much expanded 

 gonozoid, usually situated on the dorsal side or between two branches. 



Borg (1944:179) included the families Horneridae and Crisinidae, 

 and erected three new families, Steghorneridae, Pseudidmoneidae and 

 Calvetiidae, but did not discuss the Cytisidae. 



The only families we have to deal with are the Horneridae and 

 Cytisidae. 



