84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Doryporella spathulifera (Smitt), 1867 

 Plate 8, figs. 4 and 5 

 Lepralia spathulifera Smitt, 1867 :20. 

 Microporella spathulifera. Waters, 1900:87. 

 Doryporella spathulifera, Norman, 1903 ;106. 

 Membranipora spathulifera, Levinsen, 1916:441. 

 Callopora spathulifera, Osburn, 1919:608. 



Zoarium encrusting, especially on shells. The zooecia present a very 

 unusual appearance for an anascan form. The gymnocyst extends over 

 most of the frontal surface, occupying half or more of the proximal end 

 and extending widely forward on either side of the aperture, the surface 

 reticulated. The opesia is quite variable in form, usually shaped some- 

 what like a horseshoe, but may be a regular ellipse. The gymnocyst and 

 ovicell are granulated. A broad, lanceolate spine, jointed at the base, 

 arises on the median line near the proximal border of the opesia, and 

 just behind this is a small oval avicularium, also in the midline. There 

 are 4 to 6 oral spines, the lateral ones sometimes enlarged at the base. 

 At either side of the operculum is a small oval avicularium. The ovicell 

 is hemispherical, hyperstomial but not prominent. Well distributed in 

 high northern waters. 



In the Hancock collections there is a specimen from Cleveland Pas- 

 sage, Frederick Sound, Alaska, 12 fms. Also common at Point Barrow, 

 Alaska, G. E. MacGinitie, collector, Arctic Research Laboratory. 



Doryporella alcicornis (O'Donoghue), 1923 

 Plate 8, fig. 3 

 Membranipora alcicornis O'Donoghue, 1923 :26. 

 Amphiblestrum alcicorne, O'Donoghue, 1926:38. 



Zoarium encrusting on shells and pebbles. The zooecia are distinct 

 with well-marked separating grooves, averaging about 0.45 mm in length 

 by 0.30 mm in width. The proximal half of the zooecium is covered by 

 a strongly reticulated gymnocyst which extends along the sides of the 

 opesia, as in D. spathulifera. The opesia is rather regularly oval, ranging 

 in length from 0.18 to 0.22 mm and in width from 0.16 to 0.18 mm, 

 its rim thin and slightly raised. The cryptocyst is vestigial. At each 

 distal "corner" is an erect, simple or bifurcate spine; on either side 

 of the operculum another erect spine with 2 to 4 points, and toward the 

 proximal end of the opesia there is another spine with 4 to 6 points which 

 bends over the opesia. The avicularia are small, salient, with short-tri- 

 angular mandible, situated on the gymnocyst at one side of the median 



