152 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



in a plankton tow on October 31, 1949, together with immature males 

 and females about 15 mm. long (Banner, 1954). The eggs were 0.6 

 to 0.7 mm. in diameter. Very immature stages were taken on July 

 23, 1948, and immature males and females on September i, 1949. 

 Immature specimens of the "relicta" or brackish-water form of this 

 species were taken on September 13, 1949, at Elson Lagoon where 

 they occurred in great numbers along the shore, and again on July 

 28, 1950, near the Point, where they had washed ashore in such num- 

 bers that they formed rows along the beach. On September 30, 1949, 

 there were swarms of this form near shore at the base, but all the 

 500 specimens, about 13 mm. long, that were collected were 

 immature. 



Four specimens of the bathyarctic Boreomysis nobilis (Sars) were 

 taken near shore on September 27, 1948, when upwelling water 

 brought them from deep water (see "Cephalopoda"). These extend 

 the range of this species into the western Arctic. This mysid has 

 beautiful, reddish, globular, luminescent organs that emit a blue light. 



A single specimen of Neomysis rayi (Murdoch) was taken near 

 shore on July 13, 1950. 



Order CUMACEA 



The strange creatures comprising this group look like the clowns 

 of the crustaceans, but they are very retiring by nature and, instead of 

 forcing themselves upon one's attention, the majority of them must 

 be searched for. Although they appear to reach their maximum de- 

 velopment in the Arctic, the largest known species, Diastylis good- 

 siri (Bell), does not greatly exceed an inch in length. Some of the 

 larger ones at Point Barrow were white or cream beautifully marked 

 with red bands, but the majority of the species were small and were 

 an inconspicuous tan. A few specimens were found on the growth on 

 rocks, but most of them were obtained by microscopic examination of 

 the debris that collects in the bottom of jars containing unsorted 

 masses of materials. Cumaceans live and feed on the mud and detritus 

 of ocean bottoms, often at great depths. The peculiar shape of the 

 forward part of the body may well be an adaptation fitting the animal 

 for locomotion through the mud and detritus, functioning somewhat 

 like a plowshare. 



Nine species representing four families of cumaceans were collected. 

 They ranged in length from 3.4 to 25 mm. For the identifications 

 thus far received, the writer is indebted to Dr. Howard M. Feder, who 

 expects to publish on this group. 



Specimens of Diastylis dalli Caiman were collected in 1948 at no 



