128 RATHBUN 



second segment reaching the distal end of the third segment ; the flagella 

 are unequal, both exceed the antennal scale. The antennal peduncle 

 reaches nearly to the end of the scale ; the scale is short and broad, the 

 blade is rounded at the end, strongly advanced at the antero-internal 

 angle, and greatly exceeds the spine ; the flagellum is one and a half 

 times the length of the carapace. 



The maxillipeds surpass the antennal scale by nearly the whole length 

 of the last segment. The first pair of feet are shorter than the maxillipeds 

 but longer than the scale. Hands oblong, narrowing a little distally, or 

 presenting a slight constriction at the base of the spine ; three times as 

 long as wide ; anterior margin slightly longitudinal ; spine short. The 

 second and third pairs of feet are equally long, and shorter than the first 

 pair ; the fourth is shorter than the third, the fifth still shorter. 



The first to fourth segments of the abdomen are dorsally smooth ; the 

 fifth has a faint blunt median carina ; the sixth is about one and a third 

 times the length of the fifth and has four blunt carinae, two of which are 

 submedian ; the lateral carinse converge posteriorly ; the posterior superior 

 angles are armed with a strong spine, the inferior with a small spine ; the 

 telson has a deep median sulcus ; the ridges on either side of it are armed 

 with two pairs of spinules ; the tip is triangular, pointed. 



The male differs from the female as follows : The spine at the antero- 

 lateral angle is longer and more slender, and is sometimes directed out- 

 ward. The median carina is strong even to the posterior margin of the 

 carapace, and its spines are higher. The maxillipeds are shorter, exceed- 

 ing the scale by only half the length of the terminal segment. The 

 carinse of the fifth and sixth abdominal segments are stronger. The 

 ventral surface of the thorax has a thin, strongly projecting carina, cut 

 into four large saw-teeth. Each segment of the abdomen, except the 

 last, has a median ventral spine. 



Dimensions. Male (station 2881), length of body 32.6 mm., of cara- 

 pace 9.1 mm., of antennal scale 4.2 mm. Female with eggs, length of 

 body 36.2 mm., of carapace 10 mm., of scale 4 mm. 



Distribution: 



Port Etches, Alaska, 12-18 fathoms (W. H. Dall). 

 Off Cape Beale, Vancouver Island, British Columbia, 24-34 fathoms 



(Albatross stations 2879-2881). 



Puget Sound (Dana, Walker ; also collected by T. Kincaid)^ 

 Off Point Conception, California, 31 fathoms (Albatross station 2908). 

 Off San Miguel Island, California, 53 fathoms (Albatross station 2894). 

 Dana describes the abdomen as smooth ; the carina of the fifth seg- 

 ment is very indistinct in the female, while Dana in his figure indicates 

 two carinae on the sixth segment. 



