DECAPODS 125 



rhomboidal, tipped with a short spine ; the flagella are not very unequal 

 in length, and exceed the antennal scale, but not the hair which fringes 

 it. The antennal flagellum is longer than the body ; the scale is four 

 fifths of the carapace exclusive of the rostrum; its extremity is rather 

 broad and slightly rounded, and is surpassed by the outer spine. 



The maxillipeds are slender and reach beyond the scale ; the first 

 pair of feet extend to the middle of the last joint of the maxillipeds ; 

 they are similar to those of C. communis; the hands are shorter, three 

 times as long as broad ; their anterior margin, and also the dactylus when 

 flexed, are more longitudinal than in C. communis. 



The second and third pairs of feet are equally slender ; the second 

 pair is shorter than the first ; the third pair is considerably longer than 

 the first. 



The first and second segments of the abdomen have a thickened band 

 along the posterior margin, in front of which there is a slight transverse 

 depression ; the fifth segment has an obscure median carina with a short 

 depression on either side at the anterior end ; for the rest, the first five 

 segments are smooth ; the sixth has two prominent carinse and a corre- 

 sponding median depression ; the telson is slender, and has a slight 

 median sulcus ; it exceeds the uropods. 



Dimensions. Length of ovigerous female (station 2935) from tip of 

 rostrum to tip of telson 48.3 mm., length of carapace 12.2 mm., length 

 of antennal scale 8.2 mm. Even females only 22.2 mm. long are laden 

 with eggs. 



Type locality. Off San Diego, California, 124 fathoms (Albatross sta- 

 tion 2935). 



Distribution. From Monterey Bay, California, to San Domingo 

 Point, Lower California, station 3043 ; 44-266 fathoms, at 17 stations of 

 the Albatross, usually in small quantities. 



CRANGON ABYSSORUM Rathbun. 

 Crangon abyssorum RATHBUN, Proc. U. S. Nat. Mus., xxiv, 890, 1902. 



Integument very thin, membranaceous. 



Carapace and rostrum about two fifths the length of the abdomen. 

 Carapace with three carinae, extending nearly its whole length ; median 

 armed with 2 spines, one at the anterior third of the carapace (ros- 

 trum not included), the other minute, in front of the first. This small 

 spine is often broken off. Rostrum linear, flattened above, acute, as- 

 cending at an angle of about thirty degrees with the carapace, and 

 slightly curved, a little higher than wide, the lower part laterally com- 

 pressed, in length about one fourth the remainder of the carapace. The 



