52 RATHBUN 



body. Scale four fifths to eight ninths as long as carapace; blade 

 broadly rounded at the tip and exceeded by the spine. 



The maxilliped falls considerably short of the tip of antennal scale, 

 but its penultimate segment reaches to or beyond the end of the anten- 

 nular peduncle. 



The ischium of the first pair of feet is dilated in a thin, broad laminar 

 inferior projection, which is anteriorly lobiform ; the terminal segment 

 overlaps a little that of the maxilliped. The feet of the second pair are 

 equal ; the carpus has 20 to 24 segments ; the right and left carpi may 

 or may not have an equal number of segments ; the chela is as long as 

 the five adjacent segments of the carpus. The third, fourth, and fifth 

 pairs of feet are slender and similar, and armed with slender spines; 

 while they diminish regularly in length from the third to the fifth, their 

 propodi increase in length proportionally ; the dactyli are short and con- 

 tained from five to six times in their respective propodi. The third pair 

 overreaches the acicle by the length of the dactylus and at least half the 

 propodus. 



The third segment of the abdomen is moderately produced backward 

 in the middle, forming a lobe in the posterior margin ; the sixth segment 

 is nearly two and a half times as long as wide, and about two thirds as 

 long as the seventh ; this has 5 to 8 spinules on each side, of which the 

 anterior is just in front of the middle. 



Dimensions. Length 164 mm., length of carapace and rostrum 85.7 

 mm., of rostrum 57.5 mm. 



Distribution. From Washington to Mexico; off Monte Video; 309- 

 984 fathoms : 



Off Monte Video, 600 fathoms (Challenger, type locality). 

 Off Acapulco, 660 fathoms, station 3418, and near Tres Marias Islands, 



Mexico, 676 fathoms, station 3424 (Albatross, Faxon). 

 Off Cortez Bank, California, 984 and 776 fathoms, stations 2919 (one 



young) and 3627. 

 Off San Diego, 822 and 623 fathoms, stations 2983 (abundant) and 



2929. 

 Off Sea Lion Rock, Washington, 877 and 859 fathoms, stations 3074 



and 3075 (abundant). 



PANDALOPSIS ALEUTICA Rathbun. 

 Plate i, fig. i. 



Pandalopsis aleutica RATHBUN, Proc. U. S. Nat. Mus., XXIV, 901, 1902. 



Surface of carapace covered with a short and soft pubescence. Bran- 

 chial region traversed by a curved longitudinal ridge. Rostrum one and 



