NO. 1 OSBURN: EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 181 



This species is here placed in the genus Reginella since it resembles 

 R. furcata (Hincks) in all fundamental characters, except in the absence 

 of the lateral oral spines, which are also often wanting in furcata. It is 

 more heavily calcified and the proximal lip of the aperture is stronger 

 and more or less bimucronate. In the very young zooecia it is difficult to 

 distinguish the two species and I can find no differences in the ancestrulae. 

 It is a common species, occurring at 29 of the Hancock dredging sta- 

 tions and also along shore, from the northern Channel Islands off south- 

 ern Calfornia southward to Cedros Island, Lower California, and also 

 at San Esteban Island in the Gulf of California. It is present in the 

 Pleistocene from Santa Barbara to Newport Harbor, southern California. 

 The known distribution is from about 35 N Lat. to 28 S Lat. and from 

 shallow water to 121 fms. 



'^ Reginella nitida new species 



Plate 28, fig. 1 



Zoarium encrusting. Zooecia moderately large (0.60 to 0.80 mm long 

 by 0.40 to 0.55 mm wide), distinct and regularly disposed. The pericyst 

 is lower, less arched, than in mucronata and is smooth and shining even 

 in older stages; occasional traces of a carina. There are 6 to 8 pairs of 

 costae, with often a median one at the proximal end, each with 3 small 

 lumen pores which are often obscured. The intercostal grooves are broad 

 and extend across the front in full width; lacunae 6 (5 to 7), not much 

 reduced toward the midline, round or elliptical in form. The proximal 

 border of the aperture is thin in younger zooecia, but becomes heavier 

 with age and forms a vertical rim which often terminates in a low median 

 umbonate process; it does not extend forward toward the aperture but 

 projects directly upward. The aperture of the infertile zooecia measures 

 0.18 to 0.20 mm in width, while that of the fertile ooecia is about 0.24 

 mm. The ovicell appears to be exactly like that of mucronata but larger, 

 0.30 to 0.35 mm wide. There are no spines, no avicularia, and no dietellae. 



In general appearance it is like R. mucronata, but it is much larger, 

 less ventricose and is smooth and shining at all stages; there are one or 

 two more pairs of costae and usually two more lacunae in each row. The 

 appearance is neater than in mucronata which is much rougher and more 

 irregular even when growing on a smooth surface. 



Type, AHF no. 45. 



Type locality, Hancock Station 1181-40, off Howlands Landing, 

 Santa Catalina Island, southern California, 33°28'15''N, 118°26'48''W, 

 49 fms. Also at Stations 1251-41, five and a half miles south of San Benito 



