Il8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



Less abundant than the above species, 6". prince ps (Haeckel) was 

 nevertheless common during the week of July 20 to July 27, 1949, 

 and was present at other times. One specimen taken on July 26, 



1949, had five radial canals ard five tentacles. 



A single specimen of 5". tubulosa (M. Sars) taken in a plankton 

 tow on July 16, 1948, forms the first record of this species from the 

 western Arctic. 



About six specimens of what is undoubtedly the medusa of Boiigain- 

 villea superciliaris L. Agassiz were taken near shore in August 1948 

 and July 1949. One taken on July 23, 1950, appeared to be sexually 

 mature. 



Six specimens of Rathkea octopunctata (M. Sars) were taken near 

 shore in August 1948, and another one in a vertical plankton haul 

 through the ice at the 80-foot hole 1.6 miles from shore on July 13, 



1950. This transparent medusa is about 3 mm. high and 2 mm. in 

 diameter, with brown manubrium, dark -brown lithocysts, and brown 

 medusa buds. All the medusae were bearing budding medusae, and 

 some of the buds were in turn producing buds before becoming de- 

 detached from the parent. Young buds are transparent, appearing 

 somewhat like blisters, but become tan and then brown as they grow 

 older. 



The circumpolar Halitholus cirratus Hartlaub was a seasonal visi- 

 tor at Point Barrow. Occurring less frequently than Halistaura, for 

 instance, it nevertheless was common on August 3, 1948, September 

 3, 1949, and July 20, 1950. 



Suborder Calyptoblastea 



Hydroids of this group were often growing on other hydroids or 

 other animals: Campanularia on Ohelia, Sertularia, and Thuiaria; 

 Clytia (?) on the clams Nuculana sp. and Macoma calcarea, and on 

 the legs of a pycnogonid; Ohelia on the legs of the king crab Para- 

 lit Jwdes camtschatica; and Ophiodissa (?) on the stem of Tiihularia. 



The most abundant hydroid, which the writer tentatively refers to 

 as Lafoeina maxima Levinsen, was taken in large masses at Eluitkak 

 Pass and from a few to numerous colonies were taken in every dredge 

 haul from no to 477 feet, being particularly abundant at 453 and 

 477 feet. This hydroid, which resembles strands of chenille as much 

 as it does a hydroid, was usually attached to rocks but was also found 

 on barnacles, old shells, and even bryozoans. Two different species 

 may be represented, for both branched and unbranched forms were 

 common. Colonies up to 130 mm. in height were not uncommon. 



