NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 497 



conspicuous notch (not a sinus) at its middle (usually a little assym- 

 metrical). The peristome, which is thin and little raised, bears a pair 

 of strong spines, jointed at the base, widely separated, with occasionally 

 one to three smaller ones between them ; the longest spines noted 

 measured 0.50 mm; they are seldom found on zooecia of the secondary 

 layers. The interzooecial avicularia are subspatulate, the sides straight or 

 slightly converging distally, the mandible with a peculiar dark brown 

 thickened area shaped like a spade with a short handle; the beak when 

 fully formed turns sharply upward at the tip ; the largest avicularia 

 measured 0.50 mm or more in length by 0.14 mm wide, the width does 

 not appear to vary with the shorter mandibles. 



The ovicell is hooded, widely open, smooth or finely granular and 

 imperforate. 



Hincks described the species from British Columbia, locality not 

 stated, and O'Donoghue reports it from Banks Island, British Columbia. 

 Robertson failed to identify it and redescribed it as Smittia calif orniensis, 

 abundant on the California coast ; her description is very confusing, 

 containing mostly the features of H. hrunnea, but her illustration (plate 

 22, fig. 71) is definitely that of some species of Parasmittina). Dr. 

 Hastings recorded it from Taboga Island, Panama; Gorgona, Colombia, 

 and the Galapagos Islands. The species listed questionably as vagans 

 by Osburn from the Atlantic is definitely brunnea, as I have recently 

 found a specimen with spines and an avicularian mandible having 

 exactly the brown area of this species. It is presumed that the form listed 

 by Canu and Bassler is also hrunnea; at any rate it can hardly be vagans. 



Hancock Stations: recovered at more than 130 stations from Oregon 

 southward along the coast to Ecuador; taken at 21 stations at the 

 Galapagos Islands ; Socorro and Clarion Islands ; from low tide to more 

 than 100 fathoms, apparently most abundant in shallow water. 



Holoporella albirostris (Smitt), 1873 

 Plate 61, figs. 3-6 



Discopora albirostris Smitt, 1873:70. 



Holoporella albirostris, Oshmn, 1914:215; 1940:455; 1947:43. 



Holoporella albirostris, Canu and Bassler, 1928:142. 



Zoarium encrusting or erect and tubular or cylindrical. Fresh speci- 

 mens when adult are usually dark colored, with sharp-pointed rostral 

 tips white in strong contrast; younger colonies are usually white or 

 nearly so. The zooecia are characterized by a high pointed suboral umbo. 



