704 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



chambers; they do not extend between the zooecial rays farther than 

 the central ones. The ooecial cover is a thin inflated calcareous plate 

 with numerous minute pores ; secondarily the ooecial roof may be cov- 

 ered by a layer of cancelli which form a very irregular reticulum. The 

 ooeciostome is more or less excentric in position, a short erect cylinder 

 with a flaring lip which varies from nearly round to elliptical, the ooecio- 

 pore 0.10 to 0.12 mm in diameter. 



A common northern and arctic species, extending south to Cape Cod 

 on the Atlantic coast and to California on the Pacific coast; abundant 

 in the Arctic seas. 



Hancock Station, 1416-41, San Miguel Island, southern California, 

 34°02'45'"N, the most southern record. Hein Bank, Puget Sound, J. L. 

 Mohr, collector; British Columbia (Hincks and O'Donoghue) ; south- 

 ern Alaska (U. S. Crab Investigation) ; Bering Sea; and abundant at 

 Point Barrow, Alaska, shallow water to 85 fms, G. E. MacGinitie, 

 collector. 



Lichenopora buskiana Canu and Bassler, 1928 

 Plate 74, figs. 1 and 2 



Lichenopora buskiana Canu and Bassler, 1928:164. 

 Not Unicavea Calif ornica d'Orbigny, 1853:972. 

 Lichenopora Californica, Conrad, 1855:441. 

 Lichenopora californica, Gabb and Horn, 1862:176. 

 Discoporella californica. Busk, 1875:32. 

 Lichenopora californica, Canu and Bassler, 1923:203. 

 Lichenopora buskiana, Borg, 1944:219 and 224. 



The misidentification of this species with d'Orbigny's Unicavea cali- 

 fornica has led to much misunderstanding; Unicavea was described as 

 having only uniserial radii, "Toutes les lignees n'ont qu'une seule ligne 

 de cellules" (d'Orbigny, 1853:970). 



The zoaria are attached to algae especially, sometimes to shells, worm 

 tubes, etc. The central frontal area is comparatively small and rounded, 

 with large cancellae which are slightly larger than the zooecial apertures. 

 The radiating rows of zooecial tubes are connate and biserial, except 

 that they may begin with a single tube which sometimes is not connate, 

 and also that rarely there may be three series near the outer ends of the 

 radii. Near the center the tubules are unusually high and nearly erect. 

 There are usually 8 to 12 primary radii, with shorter rays originating 

 between these toward the margin. As a rule the rays are very regular 



