46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



''■' Hincksina polacantha O'Donoghue, 1926 



O'Donoghue, 1926:31. 



Zooecium oval, elongate; margin slightly raised. As a rule there are 

 two pairs of small erect distal spines, and on each side 10 to 13 longer 

 spines which curve over the aperture and overlap in the midline. The 

 aperture is completely membranous. Ooecium a marked dilatation, a little 

 more than a hemisphere, free from ridges or perforations. Apparently it 

 is of the separated endozooecial type. (After O'Donoghue). 



O'Donoghue questions somewhat the generic relationship on account 

 of the prominence of the ooecium and it may be that the species should 

 be referred to Callopora. It is reported only from Snake Island, British 

 Columbia, and did not appear in the Hancock dredgings. 



Hincksina minuscula (Hincks), 1884 



Membranipora minuscula Hincks, 1884:11. 

 Hincksina minuscula, O'Donoghue, 1926:30. 



Zooecia small, oval; margin a good deal raised, thin, smooth, no 

 spines; on an oblong area, placed above the cell, occasionally a small 

 circular avicularium, slightly raised, the mandible directed upward. 

 Ooecium semicircular, shallow, just covering the extremity of the cell, 

 smooth, with a subcircular membranous space at the back ( ? aviculari- 

 um). (Condensed from Hincks.) O'Donoghue adds the information 

 that the "membranous space" on the ovicell is usually occupied by an 

 avicularium, though this structure is occasionally separated from the 

 ooecium. 



Described by Hincks from Houston Stewart Channel and listed by 

 O'Donoghue from Gabriola Pass and Bentinck Island, British Columbia. 

 It did not appear in the Hancock dredgings. 



Genus APLOUSINA Canu and Bassler, 1927 



The genus is characterized by the presence of endozooecial ovicells 

 and the absence of spines, avicularia and dietellae (pore chambers). The 

 zooecial walls are vertical and thin, with the mural rim and the very 

 narrow cryptocyst slightly beaded. Proximally the cryptocyst usually 

 merely rounds out the corners at the proximal end, but in narrower 

 zooecia it may extend a short distance. There is a single multiporous 

 communication pore in the distal wall and two or three in the lateral 

 wall. Jullien figured A. (Membranipora) filum with a pair of vestigial 



