NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE 1 53 



feet and in 1949 at 120, 175, 184, 438, and 741 feet. The range was 

 extended northward about 2 degrees. D. bidentata Cahnan was taken 

 in 1949 at 120, 152, 216, and 295 feet and in 1950 at 204 feet. 



Two species of Diastylis, both apparently new, were washed ashore 

 during high surf in 1949. The single specimen of one of them was 

 25 mm. long. 



Several specimens of species of the genus Brachydiastyiis were 

 collected in 1949 at 216, 477, and 741 feet. Only two species of this 

 genus have been described. These above species show closest affinity 

 to resima (Kroyer), which has not been reported from Arctic Alaska. 

 A single specimen, only 7 mm. long, of a species of Leptostylis, prob- 

 ably new, was taken at 741 feet. 



Specimens of Cumella, possibly pygmaea Sars, were collected at 

 184, 216, 217, 295, 438, 453, and 741 feet. 



Two very small specimens of Leitcon, possibly nasicoides Lilljeborg, 

 were taken at 216 and 162 feet. 



A single specimen, only 3.4 mm. in length, of a species of Petalo- 

 sarsia was dredged on October 14, 1949, at a depth of 175 feet. 



Order TANAIDACEA 



Several specimens apparently all of one species, of the family 

 Tanaidae, were collected at 80 feet, and several were dredged through 

 the ice at 162 feet. These measured about 3 mm. long and were a 

 glistening milk-white. They live on mud bottom and the best way 

 to locate them in this sticky substance at Point Barrow is to place 

 some of it in a pan and pour sea water over it. In time the tiny ani- 

 mals will find their way out of the mud and come to the surface of 

 the water. 



Order ISOPODA 



For the identifications thus far made on this group the writer is 

 indebted to Dr. Robert Menzies. About 11 species, representing 8 

 genera, 5 families, and 3 suborders were collected. The four or five 

 species of Munnidae taken were not among those reported by Gur- 

 janova (1933) from the Kamchatka Peninsula. The Point Barrow 

 specimens must, therefore, either be new or else are the same as 

 European Arctic species not well known in this country. 



By far the most abundant species was Idotaega entonion (Lin- 

 naeus) {=Mesidotea entomon of authors). Over 250 specimens were 

 counted and many others were collected for use by physiologists. The 

 majority were taken at Eluitkak Pass, others along the ocean shore 

 at a depth of 10 to 15 feet. This suggests that /. entomon prefers 



