382 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The zoarium encrusts shells, pebbles and frequently algae. The 

 zooecia are moderately large, 0.60 to 0.70 mm long by 0.40 to 0,50 

 mm wide (Busk's figure 7 is within this range), the frontal somewhat 

 inflated and more coarsely punctured than in ciliata; a small umbo 

 often present proximal to the ascopore. The aperture is large for the 

 genus, 0.12 mm long by 0.16 mm broad, rounded distally, the sides 

 considerably incurved to meet the straight proximal border; rarely there 

 are very minute cardelles. The ascopore is slightly elliptical trans- 

 versely with the usual projection from the distal border; this projection 

 and the inner edge of the border minutely dentate. 



The avicularia are usually paired, one on either side of the ascopore, 

 the mandible long-triangular and sharp pointed, directed forward and 

 slightly outward. The spines are usually 5 (5 to 7), frequently long 

 and heavy, frequently black at the basal joint and occasionally dark 

 throughout. 



The ovicell is small, compared to the zooecia, and more immersed 

 than usual, width 0.26 to 0.30 mm (the base of young zooecia 0.20 to 

 0.24 mm), the radiating ribs extending well toward the top which is 

 either smooth or with a low umbo ; perforated like the frontal ; on the 

 sides extending proximally to the first spines. 



Hancock Stations: dredged at more than 20 stations from the coast 

 of Oregon southward to the Galapagos Islands (Albemarle and James) ; 

 abundant along shore and about the islands off southern California; 

 Clarion Island west of Mexico ; San Esteban Island, Gulf of California ; 

 common in shallow water at shore stations and down to 74 fms. The 

 records of Hincks and O'Donoghue from British Columbia are some- 

 what in doubt, owing to the possible confusion of this species with 

 cribrosa new species, but as I have seen a specimen from Vancouver 

 Island (Ricketts collection) they may be correct. 



Microporella marsupiata (Busk), 1860 

 Plate 44, fig. 6 



Lepralia marsupiata Busk, 1860:284. 

 Microporella marsupiata, Norman, 1909:297. 



Distinguished by an arcuate or semicircular umbonate process proxi- 

 mal to and partially enclosing the ascopore. The zoarium encrusts shells, 

 corallines, etc. The zooecia are moderate in size, 0.40 to 0.55 mm long 

 by 0.30 to 0.40 mm wide, the frontal smooth to coarsely granular with 

 numerous small tremopores. The aperture shows considerable variation 

 in form, sometimes as high as broad (0.08 by 0.08 mm), or again 



