362 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Lacerna fistulata (O'Donoghue), 1923 



Plate 36, figs. 8-11 



Schizoporella fistulata O'Donoghue, 1923:37. 



The zoarium is encrusting, thin, white and glistening. The zooecia 

 vary much in size and form, 0.40 to 0.65 mm long by 0.30 to 0.50 mm 

 wide, often wider than long, irregularly quadrilateral or hexagonal, 

 little inflated, distinct. The frontal is a veined olocyst in the young 

 zooecium but this becomes covered by a comparatively thin pleurocyst 

 which, in complete calcification, is slightly granular. There is a single 

 row of areolar pores, with the addition of 1 or 2 more opposite the 

 peristome. The aperture appears small in comparison with the zooecia, 

 0.10 mm wide by 0.08 long (not including the sinus) ; the proximal 

 border nearly straight with a moderately deep and narrow rounded 

 sinus; the vestibular arch is narrow. The operculum is moderately 

 chitinized, with a narrow border and a narrow sclerite which parallels 

 the border at a little distance. The peristome is thin, little elevated, 

 bears about 6 oral spines and is united proximally with the avicularian 

 chamber. The latter is small and narrow, shaped like a truncated cone, 

 much elevated and curved forward above the sinus; the small avicularian 

 mandible is triangular, situated on the distal side of the cone and directed 

 upward ; the chamber is bilaterally connected by a minute tube with 

 the inner pores opposite the sinus and does not reach the marginal pores ; 

 rarely the chamber is slightly asymmetrical, in which case it is con- 

 nected with only one of the pores. 



The ovicell is hyperstomial, very prominent, the distal end elevated, 

 a little flattened on the frontal surface, perforated with pores of various 

 sizes which are slightly collared ; with advancing calcification the 

 pleurocyst of the distal zooecium rises about the sides of the ovicell, 

 covering nearly all of the perforated area and forming a small pointed 

 umbo toward the distal end. The ovicell is longer than broad, 0.25 

 mm long by 0.22 mm wide, and often extends forward to the avicularian 

 chamber of the distal zooecium. 



Described by O'Donoghue from Departure Bay, British Columbia, 

 15 fms. Our material agrees closely with the description, except that 

 oral avicularian mandible is usually more or less pointed. 



Hancock Station 1191, Cortez Bank, 32°25'50"N, 119°07'30"W, 

 at 32 fms. Also dredged at stations 1294-41, off Santa Cruz Island; 

 1289-41, off Santa Rosa Island, 47 fms; 1064, off Santa Barbara 

 Island, and 1232-41, off the San Pedro Breakwater, southern Cali- 

 fornia, 15 fms. Also found on a sunken buoy off Rocky Point, south- 

 ern California, at 45 fms (Earl Fox, collector). 



