151 



'on the inner side, the fifth joint is a little longer than the 

 preceding one, slightly curved, and bent back at an angle with 

 it. The flagellum, the first four joints of which are robust, 

 is turned in the opposite direction; it bears 11 joints, the 

 terminal ones being very small. 



The epistome is short, broader than long, with the small 

 anterior surface nearly at right angles to the posterior part; 

 it is rough, and tapers quickly to an acute point be- 

 neath the rostral projection; the upper lip is slightly convex. 



In the maxillipeds the lobes of the palp are rather long, 

 resembling those in the Cymodocince. 



The first gnathopods are very robust in contrast to the 

 rest of the legs, a short thick basis is subequal in length to 

 the ischium; the three following joints are sparely pro- 

 vided with spines (3 each), which are not serrate, but are 

 apically split. The dactylus is strong, not forming with the 

 propodus a subchelate or prehensile organ, but being some- 

 what inclined that way. 



The first pleopods are smaller than the rest; the exopod 

 is nearly oblong, and, lying obliquely, projects at its base 

 beyond the edge of the peduncle; the endopod is slightly 

 longer than broad. The second pleopods have the endopod a 

 good deal longer than broad, with a thick appendix mascu- 

 lina^ which reaches as far as its fringe; the exopod is ovate 

 and smaller than the endopod. In the third pleopods the 

 exopod is longer than the endopod, with an oblique suture 

 ending in a small notch on the inner margin. The exopod 

 of the fifth pleopod has the division very near the end; 

 terminally there are two lobes nearly on the same level, and 

 two small or rudimentary at the inner end, one above the 

 other, below the suture. 



The uropods are placed on the edge of the 

 pleon, they are sublaminar ; the peduncle has an anterior 

 projection slightly over-reaching that of the antero-lateral 

 angle of the pleon ; the inner ramus is broad, curved, and dis- 

 tally bifid, its end scarcely reaching the posterior tooth of the 

 pleon; the outer ramus is shorter and narrower, and has its 

 upper surface slightly carinate, with its outer side nearly 

 straight, the inner convex, the end acute. 



One male specimen. 



This genus seems to differ considerably from any others 

 of the group that I am acquainted with. The much-deve- 

 loped antennae and the large first pair of gnathopods are, ae 

 far as I know, unique. 



Gulf St. Vincent. 



