NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE II7 



species of gymnoblasts and about 15 species of calyptoblasts were 

 collected. There are about six species of anthomedusae, perhaps two 

 of leptomedusae, about three of trachymedusae, and three or four of 

 jellyfishes. Since no special effort was made to collect jelly fishes and 

 other medusae, the number of species of coelenterates may be much 

 higher than here indicated. 



As yet no one has been found to identify the jellyfishes and medusae. 

 Dr. Cadet Hand is working on the sea anemones, and after complet- 

 ing this work he expects to identify the hydroids. Dr. Frederick M. 

 Bayer identified the one octocoral found. 



Order HYDROIDA 

 Suborder Gymnoblastea 



Colonies of Hydractinia, which partially or completely covered 

 snail shells of the genera Polinices, Neptunea, and Buccinum, occu- 

 pied either by hermit crabs or by the original owners, were taken at 

 Eluitkak Pass (gonophores present on August 10, 1948) by hand 

 dredging from 50 feet on July 26, 1948, and by dredging from depths 

 of no to 453 feet from August until the middle of October. 



The most striking hydroid was a deep flesh-colored species of 

 Corymorpha dredged from a sandy-muddy bottom at a depth of 10 

 feet on July 21, 1948 (gonophores present). Other specimens were 

 washed ashore, the largest measuring 100 mm. in length. A specimen 

 55 mm. long collected on October 16, 1949, was double-headed: at 

 about two-thirds the height of the stem it branched and gave rise to 

 another polyp about one-half the size of the main polyp. 



A species of Garveia was dredged occasionally (large flesh-colored 

 gonophores present on October 6, 1949). A species of Tubularia with 

 long straw-colored or tan unbranched stems up to 150 mm. in length 

 and with polyps at least 20 mm. across was taken frequently but 

 sparingly from depths of 80 to 477 feet. (See Tubularia under 

 "Abundance of Animals.") 



Suborder Anthomedusae 



Sarsia flammea Hartlaub was undoubtedly the most abundant hy- 

 dromedusa at Point Barrow. Although common at various times, 

 during July 1949, and especially between July 20 and July 27, there 

 were countless numbers in the water along the shore, and many were 

 carried ashore into pools in the gravel. On July 11, 1950, two speci- 

 mens were taken through the ice in a screen trap at a depth of 

 37 feet. 



