500 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



avicularia and the front rises rather sharply to form a high, smooth rim 

 above the proximal border of the primary aperture. When a suboral 

 avicularium is present the chamber is always small and low, the rostrum 

 and mandible subspatulate and varying in length from 0.10 to 0.20 mm. 

 Similar small avicularia often appear elsewhere on the front. The inter- 

 zooecial avicularia are elongate subspatulate, little raised or with the 

 elongate rostrum free and more or less elevated ; the mandibles vary 

 in length from 0.25 to more than 0.80 mm, the rounded tip decurved ; 

 attached to strong cardelles or a complete pivot. The primary aperture 

 is semicircular with the proximal border broadly arcuate, varying in 

 size in different parts of the colony from 0.18 to 0.24 mm wide to 

 0.15 to 0.18 mm long; tht peristome is thin and very little raised 

 except on the proximal border; a pair of widely separated oral spines, 

 jointed at the base and reaching a length of 0.40 mm, present only on 

 younger zooecia near the edges of the colony. The operculum is thin 

 and pale yellowish with a narrow bordering sclerite. 



The ovicell characteristic of the genus, elevated, smoothly rounded, 

 hood-shaped and widely open, 0.30 mm in width. 



The species is dedicated to Captain Allan Hancock whose numerous 

 collecting expeditions have added so materially to our knowledge of 

 the fauna of the Eastern Pacific area. 



Type, AHFno. 110. 



Type locality, Hancock Station 346-35, between Seymour and 

 Daphne Islands, 0°24'25"S, 90°2r50"W, Galapagos Islands, one colony 

 at 55 fms. Also at Station 788-38, S.E. of Daphne Major Island, Gala- 

 pagos, 0°27'00"S, 90°2r50"W, one colony at 55 fms. 



Holoporella peristomata new species 

 Plate 61, figs. 8-11 



Encrusting; zoarium roughly hemispherical in form, with many 

 superimposed layers of zooecia; the surface much roughened by the 

 extended peristomes of buried layers which project above the living 

 zooecia sometimes to a height of 0.50 mm. The zooecia are large, so 

 nearly erect that the length cannot be estimated but the width of mar- 

 ginal zooecia is 0.40 to 0.45 mm. The front is a heavy olocyst, smooth 

 in younger stages, granular when older, with a row of areolar pores 

 which are distinguishable only in young zooecia. The front rises on all 

 sides to the level of the aperture which is horizontal; the primary 

 peristome is only slightly elevated, thin and bears two widely separated, 



