146 



the articulation of the third joint; it has also an inferior 

 keel-like projection. The third joint is a little curved; the 

 flagellum consists of about 8 joints, which are longer than 

 those usually met with in other species. 



The antennal flagellum has 11 joints. 



The maxillipeds are of the usual type, the lobes of the 

 palp rather long, the distal setae rather short, the last joint 

 is subequal in length to the penultimate, apart from the 

 projecting lobe of that joint. 



The second gnathopods and the last pereiopods are sub- 

 equal in length, and are longer and slenderer than the rest 

 of the legs; the last pair bears irregularly disposed long 

 hairs, as also do the others in a less degree; the spines are 

 poorly developed. 



The first pleopod has the endopod much broader than 

 long. The second pleopod is without apjjendi.v mascuJina^ 

 and in both pairs the fringes of the exopods are very long. 

 In the third pleopods the endopod is much larger than the 

 exopod ; the exopod is without division, and its fringe is 

 long. The third pleopods as a whole are larger than tlie 

 others, including the peduncle. 



The external ramus of the uropods is straight and lanceo- 

 late, much narrower and longer than the inner ramus, and 

 terminally subacute. The inner ramus is obtuse, and 

 slightly curved outwards. 



The female is narrow-ovate in shape, the posterior part 

 of the body being conspicuously narrowed; the legs are much 

 shorter and slenderer than in the male; there are no pro- 

 cesses on the sixth segment of the thorax, the posterior 

 notch is an inverted triangular-shaped foramen, almost closed 

 behind. The uropods are subcylindrical and small; the pos- 

 terior part of the pleon has a low median tubercle. 



There are well-developed marsupial plates, and the 

 young, most of which were well advanced in the specimen 

 observed — I counted 50 in somewhat varying degrees of 

 development — occupied the whole of the body cavity, and 

 were seen close beneath the marsupial plates, as well as away 

 back near the dorsum; the body seemed to be reduced to a 

 shell, the viscera having apparently disappeared. The mouth 

 parts were highly modified. A second female had eggs 

 scarcely more advanced than a round or slightly elongated 

 shape would suggest; these showed to be directly under the 

 marsupial plates, and also to occupy the body, as in the 

 other female. 



Length of parent, about 5 mm. ; that of the largest 

 young, about 1 mm. 



Gulf St. Vincent, found on sponges. Three specimens 

 only. 



