NO. 2 osburn: eastern pacific bryozoa — cheilostomata 293 



culum is chitinized, with elongate lateral sclerites for muscle attachment 

 a little way within from the border. Peristome low and thin. The avicu- 

 laria, beside the aperture, are long triangular to very elongate and are 

 directed either forward or backward. 



The ovicell is hyperstomial, deeply embedded and somewhat depressed, 

 with small tremopores. 



Levinsen's unfortunate error in describing the ovicell as endozooecial 

 misled Canu and Bassler, 1929:276, into redescribing the species and 

 placing it under another genus, Cosciniopsis fallax. 



Widely distributed in warmer waters; western Pacific and Indian 

 Oceans and the Atlantic from Florida to Brazil. Hastings listed it from 

 Gorgona, Colombia. 



It did not appear in the Hancock dredgings, but Mr. G. P. KanakoflF 

 of the Los Angeles Museum has presented me with a fine specimen col- 

 lected by him in the Pleistocene of Newport Harbor, southern California. 



Hippopodina californica new species 

 Plate 31, fig. 9; Plate 32, figs. 1-3 



Phylactella collaris, Robertson, 1908 :307. 



This species is definitely the Phylactella collaris of Robertson, but 

 just as certainly is not the P. collaris of Norman and surely does not 

 belong in the Phylactellidae. 



Zoarium encrusting on shells and pebbles. Zooecia moderately large, 

 0.65 to 0.80 mm long by 0.35 to 0.45 mm wide, urceolate in form and 

 very distinct. The frontal is a tremocyst, highly arched, with numerous 

 infundibular pores and covered by a glistening membrane. The distal 

 end of the zooecium is elevated and projects somewhat over the suc- 

 ceeding individual. The aperture is rounded, more than a semicircle 

 beyond the prominent cardelles and the proximal border concave in a 

 smaller arc. The operculum fills the aperture, is well chitinized and has 

 a prominent sclerite all the way around slightly within the border. The 

 primary peristome is low and thin, the secondary wall thick and high; 

 in the absence of an ovicell it usually forms a complete tube, but it 

 may be wanting on the distal border, the sides often flaring outward 

 and on the proximal border it may be raised into an umbonate process, 

 directed backward or over the aperture. No avicularia, no spines, no 

 dietellae. 



The ovicells are large, 0.40 to 0.45 mm wide, very prominent when 

 young, somewhat flattened on the front, recumbent and, when calcifi- 

 cation is complete, considerably embedded. 



