NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 335 



Hancock Stations: 276, San Esteban Island, Gulf of California, 32 

 fms; 275, Raza Island, Gulf of California, 40 fms, and 431-35, off 

 Octavia Rocks, Colombia, 45 fms. Also at Albatross Station 2939, oE 

 Santa Catalina Island, southern California. The species is widely 

 distributed along the coast, from 33°36'00"N to 6°47'20''N, the depth 

 range down to 45 fms, but it appears to be rare as only one or two 

 colonies were taken at each station. 



Genus SCHIZOLAVELLA Canu and Bassler, 1920 



The genus is closely allied to Schizoporella, but the ooecial aperture 

 is closed by the operculum and there is a pair of lateral frontal avicularia 

 with long vibraculoid mandibles. Genotype, Eschara vulgaris Moll, 1803. 



Schizolavella vulgaris (Moll), 1803 

 Plate 38, fig. 13 



Schizoporella vulgaris, Hincks 1880:244. 

 Schizolavella vulgaris , Canu and Bassler, 1923:108. 



Zoarium encrusting. Zooecia about 0.50 mm long by 0.35 mm wide, 

 occasionally as wide as long, distinct with deep separating grooves; the 

 frontal tremocyst with small pores, inflated and evenly granulated. The 

 aperture is rounded distally, straighter on the sides, the proximal border 

 straight with a rather narrow v-shaped sinus, 0.12 mm in either dimen- 

 sion. The peristome is thin and low, slightly raised on the sides, some- 

 what thicker on the distal border where 3 or 4 small evanescent spines 

 are often present. The avicularia are usually paired, one on either 

 side near the lateral borders and at some distance from the aperture; 

 the base of the avicularium is small and rounded with a complete hinge 

 bar, the mandible elongate, slender and appearing "vibraculoid." 



Ovicells rounded, prominent, 0.25 mm broad, perforated like the 

 frontal, occasionally with a small umbo on the top, and closed by the 

 operculum. 



The species has been known living only in the eastern Atlantic from 

 the British Isles to the Cape Verde Islands and in the Mediterranean. 

 Canu and Bassler (1923:108) have recorded it from the Pleistocene 

 of Santa Barbara, California. It is of some interest to find it still living 

 in the Gulf of California. 



Hancock Stations: 539-36, Angeles Bay, Lower California, and 

 650-37, San Francisco Island, Gulf of California. One to 47 fms. Rare. 



