NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 483 



Phylactella alulata new species 

 Plate 59, figs. 3-5 



Zoarium encrusting on stones. The zooecia are moderately large, 

 broad and distinct, 0.65 to 0.70 mm long by 0.45 to 0.50 mm wide, 

 hexagonal, thin at the borders and rising regularly toward the aperture. 

 The frontal consists of a thin olocyst which from the internal view 

 appears to be made up of a series of minute plates; this is covered by a 

 thin pleurocyst which is finely reticulated which gives the appearance of 

 being thickly perforated, but the "pores" do not penetrate to the interior; 

 the areolar pores are very small. The peristome is striking in appearance, 

 with a high, pointed, flaring lappet on each side and a median pointed 

 umbonate process which bears a small median avicularium on its distal 

 aspect ; wanting on the distal border. The primary aperture is rounded 

 distally, the sides somewhat parallel and the proximal border broadly 

 arcuate; a little longer than broad, 0.13 mm wide by 0.15 mm long; 

 cardelles minute. The operculum is thin, with a narrow bordering 

 sclerite. The suboral avicularium has a triangular mandible and a com- 

 plete hinge bar; the chamber appears to be connected with an areolar 

 pore on each side. 



The ovicell is large, 0.40 mm long by 0.32 mm wide, prominent and 

 recumbent on the distal zooecium but not embedded ; the front bears 

 numerous scattered pores of varying form and size; not closed by the 

 operculum. 



It is a striking species from very deep water. Unfortunately it is 

 represented by only a few zooecia encrusting rocks and I have not been 

 able to study it thoroughly without destroying the specimen. The presence 

 of a median suboral avicularium does not conform to the type of the 

 genus, but in all other characters, nature of the frontal, form of the 

 aperture, small cardelles, peristome high proximally and wanting distally, 

 ovicell recumbent and perforated, the agreement appears to be perfect. 



Type, U. S. Nat. Mus., 11034. 



Type locality. Albatross Station 5688, 27°38'45''N, n5°17'40''W, 

 southwest of Point San Eugenio, Lower California, at 525 fms. One 

 small specimen which was salvaged by the writer from other inverte- 

 brate material which came to the American Museum of Natural History 

 from the 1911 cruise of the Albatross; it has been in my possession ever 

 since, awaiting a proper time for publication. 



