NO. g MARINE INVERTEBRATES, ALASKA — MacGINITIE 35 



1948, at 80 feet was carrying on its carapace colonies of the bryozoan 

 Dendrobeania tnurrayana, colonies of three or four species of calypto- 

 blastic hydroids, and at least one species of gymnoblastic hydroid. 

 From two other ovigerous females taken in this same haul the fol- 

 lowing animals were taken: 2 species of amphipods (4 or 5 indi- 

 viduals); I pycnogonid; i four-legged pycnogonid larva; 3 or 4 small 

 annelids, Eusyllis blomstrandi and Exogone naidina (one in the eye 

 socket) ; colonies of the bryozoans Tricellaria erccta and Eucratea 

 loricata; 3 caprellids ; and colonies of several species of hydroids. The 

 crabs were completely covered and concealed by their epifauna. A 

 male with a carapace 17 mm. long that was taken on September 6, 



1949, at 217 feet had several small colonies of the octocoral Euneph- 

 thya rubiformis on its carapace. An ovigerous female taken on Octo- 

 ber 14, 1949, at 175 feet, had the following on its carapace and legs: 

 Young barnacles i mm. in diameter; i Balamis crenatus 10 mm. in 

 diameter ; nematodes ; caprellids ; the annelids Spirorbis spirillum, 

 Pista maculata (small), and Harmothoe extenuata; colonies of sev- 

 eral species of hydroids ; foraminifers ; and the bryozoans Tricel- 

 laria erecta, Dendrobeania murrayana, Scrupocellaria scabra var. 

 paenulata, Hincksina nigrans, Lichenopora verrncaria, Eucratea lori- 

 cata, and Gallop or a craticula. 



STORAGE OF OIL 



A common occurrence among Arctic marine animals is the storage 

 of oil within their bodies for the purpose of tiding them over the 

 winter or for producing during the winter sperm and eggs that can 

 be laid at the beginning of the open season. This phenomenon was 

 especially noticeable among the copepods, for they are small and 

 often so transparent that the oil droplets could be seen through the 

 integument. Toward the end of the open season more and more oil 

 droplets were observed within the copepods, and, conversely, in April 

 the oil droplets began to decrease in number and size. Some copepods 

 taken on May 2 were still well supplied with oil droplets. By the 

 latter part of June these animals were so transparent that they seemed 

 to consist of nothing but the integument — not a single oil droplet 

 remained. 



The practice of storing oil is no doubt as common among the 

 amphipods as among the copepods, but the larger size and usually 

 more opaque integument of the amphipods make the oil droplets in- 

 visible or more difficult to see. On October 4, 1949, many females of 

 Anonyx nugax washed ashore. They had just molted, and the new 

 integument was sufficiently transparent to reveal many oil droplets 



