NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE I3I 



Bidenkapia spitzhe^-gensis (Bidenkap) was common and conspicu- 

 ous in dredge hauls for it often forms large colonies of laminate frills. 

 Several colonies taken on October 14, 1949, at 175 feet bore ovicells, 

 and one large colony practically surrounded a large mass of sponge. 

 A new variety, alaskensis Osburn, was collected at 140 feet. 



The new species Tegella magnipora Osburn also forms large, 

 laminate, orange-colored colonies. It was taken at depths ranging 

 from 1 50 to 420 feet. 



Next to Eucratea loricata in abundance among the erect, branch- 

 ing forms of bryozoans was Tricellaria erecta (Robertson), which 

 forms cream-colored colonies several inches in height and width. It 

 was taken at depths ranging from no to 741 feet, attached to stones, 

 tunicate holdfasts, hydroids, other bryozoans, and the carapaces and 

 legs of crabs. It was especially abundant at 175 feet. It is new to 

 the Arctic. 



In the matter of abundance, Dendroheania murrayana (Johnston), 

 in its typical form and several varieties, including jruticosa, vies 

 among the bushy forms with Eucratea loricata and Tricellaria erecta. 

 A muddy tan in color, it forms colonies up to several inches in height 

 that were common to abundant in most hauls and were present in all 

 hauls from 125 to 522 feet attached to stones, holdfasts of tunicates, 

 crabs, and other animals. 



Suborder Cheilostomata-Ascophora 



Three species of Hippothoa, forming a delicate tracery over stones, 

 shells, and other objects, were common. H. hyalina (Linnaeus), is 

 new to Point Barrow, H. divaricata Lamouroux is new to the Arctic 

 as well as Alaska, and H. expansa Dawson is new to the western 

 Arctic and to Alaska. 



Ranging in color with age from pale rose to dark purple, Stoma- 

 chetosella sinuosa (Busk), which forms round encrusting colonies on 

 shells, is common at Point Barrow. Two bright-red colonies, 15 mm. 

 and 18 mm. in diameter, were taken on October 6, 1949, at 295 feet. 

 It is new to the western Arctic. 



The related 5". cruenta (Norman) forms white or yellowish en- 

 crusting colonies that may be deep red when old. The new species 

 6". distincta Osburn forms shining, encrusting colonies on shells and 

 stones. The type was taken from 217 feet on September 6, 1949. 



Ragionida rosacea (Busk) forms beautiful, lobed, pale-peach colo- 

 nies attached by a "stem" and spreading base to stones. The colonies 

 at Point Barrow are exceptionally large — one colony with 10 lobes 



