154 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



shallow water and possibly water of low salinity ; or it may be that it 

 comes to water of low salinity to breed. Of those collected, the fe- 

 males outnumbered the males seven to one. For example, of 45 speci- 

 mens collected on September 2, 1948, 14 were males and 31 females 

 (4 ovigerous), and of 88 specimens collected on August i, 1950, i 

 was a male and the other 87 were females (4 ovigerous). The males 

 averaged larger than the females : the largest male was 86 mm. long, 

 the largest female 74 mm. 



Ovigerous females were found as soon as the ice went out and until 

 the water froze over in late fall. Females taken on July 13, 1950, had 

 young isopods (from 482 to 776) in the brood pouches, and others 

 taken on October 28, 1949, were carrying eggs only recently deposited. 

 Eggs in the early stages are yellowish green and measure about 1.085 

 by 1.020 mm. The data collected suggest that in this species egg 

 laying and development is continuous throughout the year. It may 

 be of significance that this circumpolar species has not been taken in 

 Greenland or Iceland. If brackish water is necessary for its existence, 

 the proper conditions may be lacking in these two localities. 



Idotaega sabini (Kroyer), less abundant than the above, also was 

 taken only at shallow depths, largely at Eluitkak Pass and along 

 shore. Of those collected, the males were about twice as numerous as 

 the females. As in the above species, ovigerous females with eggs 

 and brood were found early and late in the season. The males were 

 larger than the females : the largest male was 85 mm., the largest 

 female 68 mm. 



Both of these species are unusually tolerant of fresh water and the 

 former could not be killed by immersion in it. If not overcrowded, 

 both species could be kept indefinitely in a cool place in finger bowls 

 with only occasional changes of salt water. 



One male and one ovigerous female of Synidotea bicuspida (Owen) 

 were taken at 453 feet and a juvenile form at 741 feet. The female 

 was carrying well-developed young. In life this species is tan with 

 black eyes. 



An ovigerous female of Idarcturus (?) tnurdochi (Benedict) ? 

 was taken at 125 feet and a juvenile at 453 feet. This species, also, is 

 tan with black eyes. 



Thirty-eight specimens of a new species of Janiralata, including 

 males, females, and juveniles, were taken from 120 feet September 15, 

 1948, to 741 feet. The animals are tan with a sprinkling of black pig- 

 ment spots over the entire body. 



At least two species of Munna were taken from 120 to 477 feet. One 



