NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 399 



Hancock Collections: Redondo Beach and Santa Monica, southern 

 California, a number of colonies on kelp hold-fasts, washed up on the 

 beach (R. C. Osburn, coll.) ; Friday Harbor, Puget Sound, Washington, 

 collected by Dr. J. L. Mohr. Also dredged at Stations 147-34, Albemarle 

 Island, and 406, 1°03'30"S, 90°17'30"W, Galapagos Islands. The little 

 species is widely distributed along the coast and from shallow water to 

 a depth of 60 fms. 



Genus SMITTINA Norman, 1903 



Smittia Hincks, 1879 (preoc. by Holmgren, 1874). 



The frontal is a tremocyst with numerous pores; a suboral median 

 avicularium similar in origin to that of Porella; lyrula well developed, 

 and varying in length and breadth; ovicell hyperstomial, usually with 

 numerous perforations similar to the frontal pores. Genotype, Lepralia 

 landsborovii Johnston, 1847. 



The suboral avicularium is usually included in the peristomial fold 

 of the "sinus," but may be quite proximal to it; the front wall is usually 

 thick and the pores are sometimes much enlarged and infundibulate ; 

 frontal avicularia are sometimes present in addition to the constant 

 suboral type; the peristome often overhangs the primary aperture and 

 obscures its characters ; the ovicell pores are usually numerous and well 

 distributed, but in a few cases they are limited to 1 or 2 central pores 

 and even these may be occluded in final calcification. 



Key to the Species of Smittina 



1. Ovicells with 1 to 3 central pores, sometimes occluded .... 2 

 Ovicells with numerous distributed pores 3 



2. Frontal coarsely reticulate ; raised separating lines . . . retifrons 

 Frontal with enlarged pores but not reticulate, no separating lines, 



1 ooecial pore often closed bella 



3. Zooecia small, not over 0.45 mm in length, numerous very small 



ooecial pores; avicularian rostrum denticulate . . . smittiella 

 Zooecia larger, 0.60 mm or more in length 4 



4. Umbo very high, pointed, obscuring the small avicularium at its 



base ; ovicell costate, much embedded altirostris 



Umbo not unusually high, often wanting 5 



5. Peristome incomplete proximally; avicularium usually wanting; 



frontal coarsely tuberculate cordata 



