4 8 



RATHBUN 



basal three fourths thickened ; inner flagellum one fourth or one third 

 longer than outer ; basal scale reaching only to middle of first segment, 

 its distal outer angle almost a right angle. 



Antennal scale from three fourths to five sixths as long as carapace, 

 tapering to the extremity, the laminar part of which is rounded, and much 

 exceeded by the spine ; peduncle reaching to end of second segment of 

 antennular peduncle ; flagellum equaling or exceeding the length of the 

 body. 



Maxillipeds reaching nearly to end of acicle ; first pair of feet to mid- 

 dle of terminal joint of maxilliped. The right leg of the second pair may 

 slightly exceed or fall short of the tip of the rostrum; merus slightly 

 annulated; carpus with from 18 to 21 joints, those of the proximal half 

 very indistinctly marked, the last joint as long as the two preceding ; pro- 

 podus the length of the last four carpal segments, palm longer than digits. 

 Left leg of second pair one third or nearly half again as long as right 

 leg ; merus and distal portion of ischium faintly annulated ; about 60 

 carpal segments, hand and fingers much as in the right leg. Third leg 

 of female reaching beyond the rostrum by one third or one fourth the 

 length of the propodus. Fourth leg reaches one third or one half the 

 length of the propodus of the third pair, while the fifth may reach beyond 



the middle of the 

 propodus of the 

 fourth. 



Dactyli 



of the last three pairs contained about 

 four times in their propodi. The third 

 and fourth pairs of legs of the male differ 

 from those of the female in having 

 shorter propodi, that of the third scarcely 

 overreaching the rostrum; the propodus 

 of the third is also recurved instead of 

 straight and narrow at the extremity, 

 forming an oblique margin against which 

 the dactylus folds ; the dactyli of the last three pairs are contained about 

 three times in their respective propodi. 



Abdomen two and a half times as long as carapace, smooth, non-car- 

 inate, third segment very slightly produced backward in the middle; 

 sixth segment one and two thirds as long as wide ; seventh one and a half 

 times as long as sixth, and with six spinules on each side. 



Dimensions. Adult female (San Francisco market), length no mm., 

 length of carapace and rostrum 50 mm., of rostrum 26.5 mm. 

 Distribution. From Sitka, Alaska, to San Francisco, California. 



FIG. 13. Pandalus dance (y, 2). Station 

 2865. a. Acicle. b. Third leg of $ . c. 

 Third leg of 8. 



