NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE 167 



Thirteen specimens of Spirontocaris spina (Sowerby), ranging 

 from 25 to 57 mm. in length, were taken at lo stations from no to 

 453 feet. This species is red and white with a few oHve-tan spots and 

 a few chalky-white streaks. The eyes are black. Heegaard (1941) 

 found no more than two or three specimens per haul of this species 

 around Greenland. It was always taken where Balanus porcatus 

 occurs, for the shrimp hides among the barnacles. Balanus crenatus 

 may form the refuge of this shrimp at Point Barrow. 5". spina is new 

 to Point Barrow. 



The shrimp that was taken in the greatest numbers at Point Barrow 

 was Eualus gaimardi (H. Milne-Edwards). The majority of the 

 specimens were undoubtedly of the forma helcheri. There was con- 

 siderable variation : several females were found in which the third 

 abdominal segment terminated in a spine like that of the male, and 

 several males were found in which the spine on the third abdominal 

 segment was lacking ; and there was variation in the relative propor- 

 tions of the antennular palp and the antennal scale. This animal was 

 parasitized by the isopod Phryxus abdominalis and the copepod 

 Choniostoma mirabile. It is chiefly transparent pale green with mark- 

 ings of red. The eggs are green. Although this is an Atlantic-Arctic- 

 Pacific species, it has not been reported previously from Arctic Alaska. 



A few specimens of Eualus fabricii (Kroyer) were taken at no 

 and 175 feet and one male of Eualus macilentus ? (Kroyer) at 175 

 feet. Five specimens of Eualus suckleyi (Stimpson) were taken from 

 125 to 741 feet. One female was fairly transparent, with reddish 

 orange in the hepatic region, and an ovigerous female was translucent 

 white with red markings. 



Three specimens of Lebbius polaris (Sabine) were taken at no and 

 125 feet. Hofsten (1916) found that at Spitsbergen the size of this 

 species increases with the increasing depth of its habitat, but Heegaard 

 (1941) did not find this to be the case with the specimens from east 

 Greenland. In Greenland egg-bearing females of this species were 

 found in December, January, February, April, June, July, and August. 



Two specimens of Heptacarpus flexus (Rathbun) were taken at 

 no and 215 feet. This shrimp has a white body with red markings. 

 In early stages of development the eggs are yellowish cream. 



One male Crago communis (Rathbun) measuring 60 mm. in length 

 was washed ashore on September 12, 1949. It has not been known 

 north of Bering Strait previously. 



Seven specimens of Sabinea septemcarinata (Sabine) were taken 

 at four stations from no to 420 feet. The dorsal surface of this 

 species has fuzzy-edged brown pigment spots resembling tufts of 



