360 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Gemelliporella aviculifera new species 



Plate 55, fig. 13 



The zoarium is encrusting on small shell fragments and stems, the 

 colonies all small. Zooecia small, 0.35 to 0.40 mm long by 0.30 to 0.35 

 mm wide, often somewhat accumulated, distinct when young. The 

 frontal is a granulated pleurocyst with a few areolar pores which are 

 difficult to observe except when calcined. The aperture is elongate, 

 about 0.11 mm long by 0.09 mm wide, the poster noticeably wider 

 than in G. globulifera, and the condyles less prominent. The operculum 

 has the form of the aperture, slightly notched at the position of the 

 cardelles, well chitinized with a bordering sclerite and yellow in color, 

 the muscle attachments at the border. The peristome is low, thin and 

 smooth, usually not obscured by the encroachment of the frontal. 



The most striking feature of the species is the large avicularium the 

 base of which occupies a considerable portion of the frontal. It is 

 situated near the aperture, at one side and proximal ; it is much 

 elevated and more or less pedunculate, broader at the top which is 

 extended into a horizontal beak ; the mandible long and narrow and 

 strongly decurved, as much as 0.15 to 0.20 mm in length, hinged to a 

 cross-bar. The avicularia are present on every zooecium and give a very 

 rough appearance to the zoarial surface. 



The ovicell is globular, very prominent, not closed by the oper- 

 culum, perforated by numerous small pores, 0.20 mm wide. The ovi- 

 cells are usually very abundant, and in living specimens the frontal 

 is almost entirely obscured by the large ovicells and avicularia but on 

 dead colonies usually only the bases of these remain. 



Type,AHFno. 73. 



Type locality, Hancock Station 1245, 1^ mi. southwest of Gull 

 Island, off Santa Cruz Island, southern California, 33°56'00"N, 119° 

 50'55"W, at 48 fms. Also 1294, Santa Cruz Island, and 232, 1050 

 and 1413-41 ofiF San Miguel Island, southern California; 1250-41, 

 San Benito Islands, Lower California, 28°18'15"N Lat., the most 

 southern record. Depth range 10 to 44 fms. 



Gemelliporella inflata new species 

 Plate 43, fig. 11 



Zoarium encrusting, white. The zooecia are very distinct with a 

 highly arched frontal and deep separating grooves, 0.55 to 0.70 mm 

 long by 0.40 to 0.50 mm wide, ovate to elongate hexagonal in form and 

 arranged in quincunx. The frontal is a rather thin pleurocyst, minutely 



