1 3O RATHBUN 



fifth, and sometimes the first, segments of the abdomen are carinated, 

 and (except on the first two) the carina usually high, laterally com- 

 pressed, and blunt. The lateral spinules of the telson are considerably 

 behind the middle of the segment. The median spines or teeth of the 

 ventral side of the thorax in the male are laminar and dentiform; the 

 anterior one has an acuminate, the others an acute, tip. 



Dimensions. Female, length of body 32.2 mm., of carapace 9.2 mm., 

 of hand 5.6 mm., width of hand 2 mm. Male, length of body 24.6 mm., 

 of carapace 7 mm., of hand 4.1 mm., width of hand 1.5 mm. 



Type locality. Off North Head, Akutan Island, Alaska, 72 fathoms 

 (Albatross station 2842). 



Distribution. Bering Sea, Alaska Peninsula, and Aleutian Islands; 

 California; 50-695 fathoms. Taken by the Albatross at the following 

 stations : 

 Bering Sea, off the Pribilof Islands, 81-184 fathoms, stations 3486, 3488, 



3489, 35> 3602. 



Off Rat Islands, 55 fathoms, station 3599. 

 North of Unalaska, 225 fathoms, station 3227. 

 Off Akutan Island, 91 fathoms, station 3548. 

 Northwest of Unimak Island, 121 fathoms, station 3224. 

 Unimak Pass, 5056 fathoms, stations 3222, 3223. 

 Off Davidson Bank, 280 fathoms, station 3337. 

 South of Sannak Islands, 483 fathoms, station 3210. 

 Off Shumagin Bank, 625 and 138 fathoms, stations 3338, 3339. 

 Southeast of Chirikof Island, 695 fathoms, station 3340. 

 Off the Trinity Islands, 159 fathoms, station 2853. 

 Southwest of San Nicholas Island, California, 158 fathoms, station 2898. 



Variations. There is more variation in this species than is usual in 

 this genus, perhaps owing to the great bathymetrical range. 



The rostrum is often much thickened and elevated, the median sulcus 

 being almost obliterated. 



The hand is not of uniform proportion. It is a little longer in the male 

 than in the female, and varies in specimens of the same sex from differ- 

 ent localities. The median abdominal carina is in general less strong on 

 specimens from deeper water. 



These differences are not constant enough to warrant the division of 

 this species. 



CRANGON SPINOSISSIMA Rathbun. 

 Crangon spinosissima RATHBUN, Proc. U. S. Nat. Mus., xxiv, 891, 1902. 



The relation of this species to C. variabilis is similar to that which C. 

 acclivis bears to C. munita. The lower lateral spine of the carapace is 

 more nearly in line with the superior lateral spine ; the anterior median 



