126 



RATHBUN 



Fig. 66. Crangon alyssorum. 9 (X 2) 

 Station 3603. a. 

 part of carapace, 

 and dorsal spines. 



Dorsal view of anterior f^e blade 

 o. bide view of rostrum 

 c. Acicle. d. Chela. 



lateral carina extends backward from the orbital sinus. There is a strong 

 hepatic spine at the end of a short carina ; also a spine at the outer angle 

 of the orbit and an antennal spine. 



Eyes very large, hemispherical, their inner faces flat and contiguous, 

 the carinse covering nearly all the outer face, Antennules rather slender ; 



the scale at base is small, falcate, and 

 acuminate, the second segment about one 

 and a half times as long as the third ; the 

 flagella both exceed the antennal scale, 

 the inner is only a little longer than the 

 outer. The antennae have a slender spine 

 at the outer base of the scale, which is 

 narrow-oblong and about three fourths as 

 long as the carapace (rostrum excluded) ; 

 is rounded at the end, and 

 the spine projects beyond it ; the peduncle 

 reaches to the distal third of the scale, its last joint is very slender, the 

 flagellum is about as long as the body. 



The maxillipeds are slender and exceed the scale by nearly half the 

 length of the terminal segment. The first pair of feet do not reach the 

 end of the scale. The merus has a small superior terminal spine. The 

 manus widens a little distally ; its length is three times its width measured 

 at the inner base of the spine ; the dactylus is more longitudinal than 

 transverse. The second and third pairs of feet are equally filiform and 

 delicate ; the second reaches to the middle or beyond the middle of the 

 palm of the first ; the third reaches beyond the antennal scale ; the fourth 

 pair also exceeds the scale ; the fifth pair is a little shorter. In the male 

 the sternum has a median carina with a small spine on each segment. 



The fifth segment of the abdomen has a low blunt carina; the sixth 

 has two prominent dorsal carinse and a low lateral carina on each side 

 near the dorsal, but extending only half the length of the segment ; the 

 telson has a median furrow on its anterior fourth ; it exceeds the uropods. 

 Dimensions. — Length of female 6i mm., of carapace and rostrum 17 

 mm., of carapace exclusive of rostrum 13.5 mm., of antennal scale 10.3 

 mm. 



Type locality. — Bering Sea, southwest of Pribilof Islands, 1771 fath- 

 oms {Albatross station 3603). 



Distribution. — A deep-water species extending from Bering Sea to the 

 southern extremity of California, in 685—1771 fathoms. Taken by the 

 Albatross at the following localities : 

 Bering Sea, south of Pribilof Islands, 1401 fathoms, station 3604. 



