42 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



emarginate, with a small, rounded projection occupying the center 

 of the emargination. 



"Upper antennae with the basal joint moderately stout, a tactile 

 seta halfway up the outer margin; second and third joints subequal, 

 their combined length scarcely more than half that of the first joint; fil- 

 ament consisting of about 17, secondary appendage of 4 articulations. 

 Lower antennae reaching to the end of the peduncle of the upper; the 

 scale smaller than usual, only reaching to the middle of the fourth 

 joint, and bearing only four setae, two on the exterior margin and two 

 apical, and none on the interior margin. 



"The first gnathopods are slender and weak, and without much 

 character; wrist very long, two and a half times as long as meros, 

 with many cilia on the front margin; hand with the basal portion 

 slender, and scarcely wider than the wrist; thumb and finger long, 

 without any tubercular processes on the inner margin, the distal 

 portion of that of the thumb bearing a series of microscopic flattened 

 teeth, arid short, stiff, obtusely ending cilia; finger having about five 

 short stumpy spine-like teeth just before the unguis commences. 



"Second gnathopods strongly built, basos naked; meros having the 

 front margin ciliate, and bearing a distal spine, upper margin with a 

 distal bunch of cilia; wrist unusually short, scarcety more than half 

 the length of meros, above with many cilia and a large distal spine, 

 below with four cilia and two or three spines; hand widely ovate, 

 rather longer than the wrist, upper margin with two spines and a few 

 cilia; palm closely set all round with ten stout spines, but no cilia; all 

 the spines of the limb are stout, but quite simple in character; finger 

 strong, with four denticulations on the margin. 



"Last peraeopods slender, basos naked, the three succeeding joints 

 having one or two minute cilia on the front margin, except that the 

 carpus (which is slightly longer than the meros and hand, which are 

 subequal to each other) has a long slender distal spine on the front; 

 hand with a distal spine above and two slender spines on the palm, 

 and passing obliquely across the last half of the joint, commencing 

 beyond the middle of the palm and terminating at the upper margin 

 of the origin of the finger, is a pectinated series of lancet-shaped 

 spines, of which the margins are apparently simple. Finger of most 

 unusual length, half as long again as the hand, the unguis especially 

 being very greatly produced. 



"Pleopods greatly developed, the peduncle long. 



"Uropods with one branch consisting of about 7, the other of 18, 

 articulations. 



"The foregoing is a description of the females, one of which has 

 incipient growths of the marsupial sac at the base of the second, third, 

 fourth, and fifth peraeopods. 



