THE COPES^HAGEN MUSEUM AND OTHEK SOUECES. 29 



Second antennm. In the male about two-thirds the length of the animal, the ultimate 

 joint of the peduncle considerably longer than the penultimate, flagellum of about thirty- 

 five slender joints. 



Mouth-organs closely agreeing with the generic account given by Sars in ' The 

 Crustacea of Norway.' The slender mandibular palp has the first joint characteristically 

 elongate, and there are but few spines on the paljj of the first maxillae. 



First gnathopods. The side-plates widened below, so that they are as wide as deep ; 

 the second joint as long as the four succeeding joints combined, the third larger than 

 the fourth, the fifth much wider but rather shorter than tlie narrow, taj)ering sixth ; the 

 finger curved, small. 



Second gnathopods. The second and third joints slender and elongate, the fifth as long 

 as the third, the sixth more than half the length of the fifth, gradually widening distally, 

 with short transverse palm, on which the finger closes tightly, without overlapping it. 



First and second permopods. The side-plates of the second pair are deeply and rather 

 widely excavate behind. The second joint of the limbs comparatively short ; the fourth, 

 fifth, and sixth joints rather long, with some plumose setae. 



Third percBopods. The side-plates wider than deep, pretty evenly bilobed ; the second 

 joint as broad as long, smaller than the side-plates ; the fourth joint rather broad, 

 produced to an acute point. 



Fourth and fifth perceopods. The second joint broader and much longer than in the 

 preceding paii", roundly produced behind. 



Branchial vesicles strongly pleated. 



TJropjods slender. First pair with the rami subequal, more than three-fourths as long 

 as the peduncle, each with three marginal spines. Second pair, with subequal rami, 

 almost as long as the pedimcle ; the outer ramus with four marginal spines, the inner 

 constricted near the end, with a spine in the notch. Third pair with the peduncle 

 longer than the rami, produced to a point at the outer angle ; the inner ramus a little 

 shorter than the outer, both with long setae on the inner margin. 



Telson oval, not reaching far along the peduncle of the third uropods, having a 

 feathered setule on each lateral margin, and the apex smootlily rounded. 



Length three-tenths of an inch. 



Labelled " Trincomali (Ceylon), 3/89, surface. K. Fristedt," Copenhagen Museum. 



Lysianax cubensis, u. sp. (Plate 7 B.) 



Lateral angles of the head considerably produced, broadly rounded. Postero-lateral 

 angles of third pleon-segment quadrately rounded. 



FJi/es reniform, moderately large. 



First antenncB. First joint large, longer than deep, not very much longer than second 

 and third combined, neither of tliese being extremely short; flagellum six-jointed, shorter 

 than the peduncle ; accessory flagellum three-jointed, less than half the length of the 

 primary. 



Second avtennce. Last two joints of the peduncle (in the female) subequal ; flagellum 

 broken. 



