NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 689 



extends only about one third of the distance above the base and the 

 peristomes protrude above the level of the front on the v\^hole upper two 

 thirds of the zoarium. Ovicells are not developed on any of our speci- 

 mens, and in their absence positive identification is impossible. Hov^^- 

 ever, the zoarial characters given by Johnson (1897:61) in his amplifi- 

 cation of Busk's description of pectinata apply very well to our speci- 

 mens: 



"branches terete . . . ultimate branches tapering . . . Anterior sur- 

 face pierced by numerous oval pores, which are sunk in depressions and 

 have slightly raised borders. Between the pores the surface is irregularly 

 ridged. The pores on the dorsal surface are larger and are partially 

 filled up inside. The peristome is minutely dentate." 



Johnson also describes the ovicell, "dorsal, brownish, semiglobular, 

 and the surface is thickly set with warts, each of which has a depression 

 at the top with a perforation therein." 



The species has been recorded only from the Madeira Islands. 



Hancock Stations: 1397-41, Santa Rosa Island, 33°38'40"N, 119° 

 58'30"W, at 77 fms; 1299, off Point Firmin, 33°4r45''N, 118°17'50" 

 W, at 18 fms; and off Santa Catalina Island, 33°24a5''N, 118°13'30" 

 W, at 228 fms ; all from southern California. 



Hornera pinnata Canu and Bassler, 1929 

 Plate 72, figs. 7, 8, and 9 



Hornera pinnata Canu and Bassler, 1929:550. 



The zoarium is erect from a very small base, the branching dicho- 

 tomous and irregular, the branches with short pinnules of various sizes. 

 There are usually two rows of peristomes on each side of the midline, 

 sometimes only one row, irregularly alternating, the outer ones the 

 longer. The frontal surface is deeply grooved, the pores conspicuous and 

 3 to 5 in number on each tubule. The peristomes measure about 0.12 

 mm in diameter and the aperture about 0.10 mm. The pinnules (dwarfed 

 branches) vary greatly in size and the number of their tubules varies 

 from 3 to 8 ; sometimes a pinnule ends in a blunt point with a peristome 

 medially placed at the tip. The dorsal side of the zoarium is deeply 

 grooved longitudinally, with conspicuous pores at the bottom of the 

 grooves. 



Ovicells are wanting on all of our specimens, so it is impossible to be 

 absolutely certain of the species, but the zoarial characters seem to agree 

 closely with the description of pinnata. Also I have for comparison an 

 ovicelled specimen from Hawaii which is undoubtedly H. pinnata. The 



