682 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



of the carapace and armed with a rudimentary exopod, as in exills. 

 The endopod in the present species, howev^er, is bifurcate at the tip; 

 the inner branch slender and pointed, the outer one twice the length 

 of the inner, stout, and bluntly rounded at the end. 



Furca small, the length only twice the width; the rami simple, short, 

 stout, bluntly rounded, and less than half the length of the basal por- 

 tion. The latter is elliptical or oval with a large foramen of the same 

 shape. 



The swimming legs are all biramose, the rami of the first pair two- 

 jointed, of the other pairs three-jointed. Fifth legs invisible dorsall}^, 

 but consisting of a small papilla at each posterior corner of the genital 

 segment on the ventral surface. 



Oviducts not much coiled in the genital segment; cement glands of 

 the usual shape, parallel with each other, and reaching well forward 

 toward the anterior margin of the segment; the gland cells short and 

 transversely linear. 



Total length, 9 mm. Length of carapace, including third thorax 

 segment, 3 mm. ; of genital segment, 2.33 mm. ; of abdomen, 3 mm. ; of 

 egg-strings, 2.8 to 4 mm. Width of carapace, 2.5 mm. 



Alcoholic specimens a dull yellowish horn color without any traces 

 of pigment. 



{caudatus^ tailed, alluding to the great length of the abdomen.) 



'Male. — Carapace orbicular half the entire length, and full}" as wide 

 as long; only slightly narrowed anteriorly. It is even more strongly 

 arched than in the female and, as Kroyer says, ma}' be called ''hunch- 

 backed," since the posterior portion falls away rapidly. The markings 

 and grooves are similar to those on the female. The third thorax 

 segment projects behind the lateral carapace lobes considerably farther 

 than in the female; it is twice the width of the fourth segment, but 

 about the same length. The fourth segment is spindle-shaped and 

 about the same width as the genital segment. 



The latter is proportionally very small, less than one-fifth the entire 

 length, a little longer than wide, with the sides and posterior end 

 evenly rounded, while the anterior margin is squarely truncated. 

 Abdomen narrow and a little longer than the genital segment, made 

 up of two joints about the same width, but the terminal one one-third 

 longer than the basal. 



Anal laminai one-quarter the length of the abdomen, slightlv diver- 

 gent, and each armed with five plumose setfe, the inner of which is 

 the longest and about three times the length of the lamina. Append- 

 ages as in the female. In speaking of the second maxillipeds, Kroyer 

 saj's that he is "certain they are three-jointed since the base of the 

 claw where the seta goes out shows a distinct jointing." This does not 

 seem probable, and none of the specimens examined by the author 

 show it. 



