NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE I45 



Class ASTEROIDEA 



Fourteen species of starfishes have been reported from the eastern 

 Arctic (from Greenland to the New Siberian Islands). Three of 

 these, Crossaster papposus, Solaster endeca, and Henricia sanguino- 

 lenta, wtre. found at Point Barrow. In addition, three species, Lep- 

 tasterias polaris forma acervata, L. groenlandica forma cribraria, and 

 L. arctica forma arctica, that are not known from the eastern Arctic 

 were collected. These last three species are new to Point Barrow. 



Thirteen specimens of Crossaster papposus (Linnaeus) were col- 

 lected. About half of these were washed ashore at a small bight near 

 the Point, and the others were taken at 125 feet, 120 and 130 feet 

 (September 15, 1948), and 152, and 741 feet. 



Five specimens 0/ Solaster endeca (Linnaeus) (197 to 246 mm. in 

 diameter) were washed ashore near the Point, and a small individual 

 (85 mm.) was dredged at 420 feet. This is the first record from the 

 western Arctic. 



Two individuals (35 mm.) of Henricia sanguinolenta (O. F. 

 Muller) were dredged at 125 and 741 feet, and one (50 mm.) washed 

 ashore near the Point. 



Nine specimens of the 6-rayed Leptasterias polaris (Stimpson) 

 forma acervata Stimpson were collected : 8 from the shore near the 

 Point, and i on the shore by the base. They ranged between 107 

 and 223 mm. in diameter. 



Five individuals (from 12 to 32 mm. in diameter) of L. groenlandica 

 (Liitken) forma cribraria (Stimpson) were dredged at 741 feet. 

 Three specimens of L. arctica (Murdoch) forma arctica Murdoch 

 were collected: one at 184 feet, one at 216 feet, and one from the 

 beach. 



Class OPHIUROIDEA 



Of 10 species of ophiurans known from the eastern Arctic, 6 were 

 collected at Point Barrow, two of them new to that area. Two species 

 not known to the eastern Arctic were also collected. 



Well over a dozen specimens of the basket star Gorgonocephalus 

 stimpsoni (Verrill), the largest with a disk 75 mm. in diameter, were 

 collected at 125 feet, 130 feet (September 15, 1948, and August 9, 

 1949), and 522 feet. One young one in the ophiocrenoid stage, arms 

 forking only once, with a disk only 2 mm. in diameter, was taken at 

 125 feet. Two collected on August 9, 1949, with disks 17 and 21 mm., 

 respectively, spawned freely in the laboratory. Swimming larvae 

 developed. 



