598 I'ROCEEDIXaS of the national museum. vol. xxvm. 



long- as wide, apparently unseg'niented. From a study of the figures 

 given hy Kroyer and Steenstrup and Liitken, and from comparison 

 with the developmental histoi-y of C honifo it would seem reasonaljly 

 certain that in the present species there is a similar development. In 

 innnature females the abdomen is plainly two-jointed, the joints being 

 fairly equal, hut as development proceeds the terminal joint increases 

 fastei' than the basal. Hence, in mature females the abdomen is prob- 

 ably two-jointed, A\ith the basal joint only one-third or one-fourth of 

 the terminal. Anal lamina' small, foliaceous, and curved in toward 

 (»ach other. The plumose seta% with which they are armed, are rather 

 small. \^^^^^ cases narrow and rcnu'liing ordy to the tips of these seta>, 

 each containing about thirty eggs. 



Anterior antenna> with a short, stout basal joint and a very slender 

 terminal joint of al)outthe same length, the whole appendage less than 

 the space between the lunules. 



Second antenna; with a stout l)asal joint bearing a short and blunt 

 accessory spine on its posteri(n- boi'der. 



First maxilh\? small and strongly curved; second maxilhe narrow 

 triangular with acuminate tips, twice as long as wide and straight. 



First maxillipeds slender and of the usual form; second pair large 

 and stout, the basal joint nuu-h swollen, the terminal claw small. The 

 claw is scarcely half the length of the basal joint, but is stout and well 

 curved. 



Furca slender, the basal portion narrower and shorter than the 

 branches, almost circulai- in outline, and connected with the branches 

 by a narrow neck. The branches are divergent, rather slendei-, nnd 

 blunt. 



First swimming legs with the usual armament of three terminal claws 

 graded in size, a long slender plumose seta at the distal corner l)eside 

 the sujallest claw, and three rather small plumose setie on the posterior 

 margin. Tlie sjjines on th(> exopods of the second legs are very long 

 and acuminate; the two on the two l)asal joints are inclined at an angle 

 of about -1.^) degrees with the anterior margin, while the one on the 

 terminal joint is nearly parallel with that margin. 



The rami of the third legs are well separated, but the two terminal 

 joints of the exopod are turned in and appressed close to the margin 

 of the basal apron. And they reach so far across the intervening 

 space between endopod and exopod that the two rami appear close 

 together. The spine on the basal joint of the exopod is long, slender, 

 and curved into a sickle shape. 



The fourth legs are of medium size, l)ut rather short and three- 

 jointed, with only four spines, one at the distal end of the second 

 joint, one on the outcu- margin, and two at the end of the terminal 

 joint. The last three are almost in a row, the outer one l)eing l)ut a 

 little behind the others. All these spines are very long and acuminate; 



