430 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Rhamphostomella curvirostrata O'Donoghue, 1923 

 Plate 50, fig. 4 



Rhamphostomella curvirostrata O'Donoghue, 1923:44. 



Zoarium encrusting in a thin layer. The zooecia are moderately 

 large, 0.75 to 0.85 mm long by 0.40 to 0.55 mm wide, the front evenly 

 arched, undecorated except for fine granulation, with a row of large 

 areolar pores; the costae separating the pores do not extend upon the 

 front. There is often a raised line in the groove separating the zooecia. 

 The primary aperture is nearly round, the proximal border bisinuate 

 with a small cardelle at each side and a lyrula of varying width (notched 

 at the tip) in the middle ; 0.24 mm wide by 0.22 mm long. The peristome 

 is thin, high and tubular, continued around the aperture except for a 

 notch at the middle of the distal border; at one side of the proximal 

 border is an elevated avicularian chamber, with a long, laterally curved 

 rostrum which extends more or less across the proximal part of the 

 aperture and which may fuse with a prominent lappet on the opposite 

 side to enclose the proximal part of the secondary aperture. The mandible 

 is elongate-triangular, curved laterally and hooked at the tip. Occasion- 

 ally the avicularium is wanting and two lateral lappets extend toward 

 each other across the aperture. 



The ovicell is hemispherical and prominent, about 0.40 mm wide 

 by 0.35 mm long, smooth, with numerous pores. 



The most striking characters of this species are the high peristome 

 and the curved and elevated avicularium which partially or entirely 

 subdivides the secondary aperture. 



Described by O'Donoghue from Bull Passage, Northumberland 

 Channel, British Columbia, 15 to 25 fms. 



Hancock Station 1662-48, Santa Cruz Island, southern California, 

 numerous colonies at 23 fms. Also on a sunken buoy recovered from 

 45 fms off Rocky Point, California, Earl Fox, collector; and San 

 Juan Island, Friday Harbor, Puget Sound, Dr. J. L. Mohr, collector. 



Rhamphostomella townsendi new species 



Plate 51, figs. 2-3 



Zoarium encrusting on sponge. The zooecia are large, 0.85 to 1.15 

 mm long by 0.50 to 0.60 mm in width; the frontal rather evenly in- 

 flated and beautifully reticulate with honeycomb impressions, with con- 

 spicuous areolar pores between which the short costae extend only 

 slightly; a prominent line in the deep separating grooves. The primary 

 aperture is nearly symmetrical, rounded, with a pair of pointed cardelles 



