730 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Hancock Station 1642-48, off Point Vicente, southern California; 

 also Friday Harbor, Puget Sound, J. L. Mohr, collector; Cold Bay, 

 Alaska, U. S. Alaska Crab Investigation ; and off Newport, southern 

 California, which well may be the southern extension for this species. 

 The known depth range is 15 to 70 fms. 



Alcyonidium pedunculatum Robertson, 1902 

 Plate 77, fig. 3 



Alcyonidium pedunculatum Robertson, 1902:106. 

 Alcyonidium pedunculatum, O'Donoghue, 1926:55. 



The zoaria of this unusual species are erect, arising from a short 

 "peduncle" into wide flat saccate expansions, the largest of those in the 

 Hancock collection, from Puget Sound, Washington, measuring 6.5 cm 

 high and 4.5 cm wide. The largest from Alaska measures 11 cm long 

 and 3 cm in width. The "peduncles" are wrinkled, rough, coriaceous 

 in appearance, short, stout, cylindrical, and contain a loose reticular 

 connective tissue. The zooecia are not modified as they are in the true 

 peduncle of Clavopora, i.e., for bending and swaying the colony. The 

 expanded portion of the zoarium is sac-like, filled with loose connective 

 tissue, and may have several finger-like projections, or it may be a single 

 foliaceous lobe. These lobes are smooth, light brown in color. The 

 zooecial outlines are well marked, an irregular hexagonal shape. Sec- 

 tioning disclosed the tentacle number to be 17. 



Miss Robertson's specimens were from the Pribilof Islands, Alaska. 

 O'Donoghue (1926) reported the species from the Vancouver Island 

 region. 



The specimens in the Hancock collection are from Alaska, Arctic Re- 

 search Laboratory, G. E. MacGinitie, collector, and Puget Sound, 

 Washington, J. L. Mohr, collector. There are 10 stations ranging in 

 depth from 20 to 35 fathoms. 



Alcyonidium disciforme (Smitt), 1871 

 Plate 77, figs. 5 and 6 



Alcyonidium mammillatum var. disciforme Smitt, 1871:1122, 1123. 

 Alcyonidium disciforme, Osburn, 1936:540. 



The mature zoaria have a very distinctive, characteristic morphology. 

 Resembling a common wide rubber washer or large coin with a circular 

 hole punched from its center, these zoaria form circular, slightly convex 

 discs, which apparently rest upon soft sandy substrata. Young colonies 

 lack the central hole. Minute, fine root-like extensions from the basal 



