76 RATHBUN 



scale ; the second segment is about three times as long as the third ; the 

 basal scale falls considerably short of the second joint of the peduncle. 

 The antennal peduncle does not reach the middle of the second segment 

 of the antennular peduncle ; scale similar to that of S. unalaskensis. 



Abdomen like that of the preceding species. The telson is incomplete 

 in all the females. 



Male. In the single male, the rostrum is a little shorter than the cara- 

 pace and does not reach the end of the antennular peduncle ; it is also 

 straighter than in the female, and is armed with 6 spines above and 3 

 below. 



Dimensions. A female with rostrum and telson broken measures 39 

 mm. from the orbit to the end of the sixth abdominal segment. A female 

 about the same size, in very bad shape, is laden with eggs, each about 3 

 mm. in its greatest diameter. Male, length 50 mm., length of carapace 

 and rostrum 18.5 mm., of rostrum 8.5 mm. 



Distribution. North of Unalaska, 309-406 fathoms, stations 3316 

 (type locality), 3330, 3332. 



SPIRONTOCARIS WASHINGTONIANA Rathbun. 



Spirontocaris washingtoniana RATHBUN, Proc. U. S. Nat. Mus., XXIV, 895, 

 1902. 



Female. Carapace stout, carinated in its anterior half; posterior 

 median spine situated at the anterior fourth of the carapace. Rostrum 

 slender, half as long as the carapace, reaching just to the end of the first 

 segment of the antennules, nearly horizontal, 

 slightly sinuous ; dorsal spines 4, two of which 

 are on the carapace, anterior two fifths of rostrum 

 unarmed above ; 3 teeth below on anterior third, 

 FIG. 30. spi^mto^aris wash- one tooth close to the tip; except for the teeth, 



ingtoniana. Side of carapace of, . i i i i t ti 



(x ai). station 3071. the rostrum is scarcely limbed above or below. 



Anterior margin armed with 3 spines, one supraorbital, one antennal, one 

 smaller at the antero-lateral angle. 



Antennular peduncles reaching nearly to the base of the spine of the 

 antennal scale ; first segment with a large bifurcate spine on the anterior 

 margin toward the outer angle; second segment with a long simple 

 spine in the same position ; third segment with a small dorsal spine at 

 the middle of its anterior margin ; the first segment is about twice as long 

 as the second, the second three times as long as the third ; the flagella 

 are subequal in length, and half again as long as the peduncle ; scale 

 about two thirds as long as first segment. The antennal scale is two 

 thirds as long as the carapace, oblong-lanceolate, extremity of blade 



