REPORT ON THE CUMACEA. 15 



The antennae (fig. 5, a 2 ), originating immediately behind the antennulse, are, as usual, 

 quite rudimentary in the female, only consisting of a broad lamellar basal part and a 

 very small conical terminal segment, the latter representing the rudiment of the flagellum. 

 The basal part is highly indurated, and bears on the inner (or upper) edge two very 

 strong and densely ciliated setae ; the terminal segment, which is connected to the basal 

 at an obtuse angle, is tipped by a bunch of very minute auditory seta?. In the young 

 male the antennae show an appearance quite simdar to that described further on in the 

 male of Paralamprops serrato-costata, and lie folded beneath the lateral parts of the 

 carapace, so as not to be visible in the lateral aspect of the animal. 



The anterior lip (fig. 5, l) forms a comparatively small rounded lobe, projecting 

 immediately behind the antennal segment. It is slightly emarginate at the free posterior 

 edge, and finely cdiated within the emargination. 



The posterior lip (fig. 7), on the other hand, is rather large and quite membranous in 

 structure. It consists of two somewhat subtriangular lobes, connected at the base, and 

 terminating in a slightly inflexed angle armed with three strong compressed teeth. The 

 lobes are, moreover, densely cdiated along their inner edge, as also at the outer part of 

 the exterior margin. 



The mandibles (fig. 8), as usual, do not exhibit the slightest trace of a palp, and are 

 wholly indurated and rather brittle, so that they easily break by slight pressure. Their 

 body is navicular in form and shows an elegantly reticulate structure ; its posterior 

 pointed extremity is articulated to the dorsal part of the carapace at the point where, on 

 each side, the fissure separating the gastric area from the lateral parts begins. From 

 the anterior part of the body two unequal branches originate, the one projecting forward 

 nearly in the axis of the body, the other inward at a right angle to the same. The 

 anterior branch is slightly compressed and has the tip incurved, with the cutting 

 edge somewhat different on the two mandibles. On the right mandible it is simple 

 and only divided into two small teeth, whereas on the left mandible it is double, forming 

 two acute projections, each indistinctly bidentate, and the posterior one movably con- 

 nected with the anterior. Behind the cutting edge there is a dense series of curved 

 spines, arranged in a comb-like manner and occupying almost the whole length of the 

 inner edge of this branch. The posterior branch, representing the so-called molar 

 tubercle, is shorter and more cylindrical in form, and terminates in a finely fluted 

 surface, more oblique on the right than on the left mandible. 



The first pair of maxillae (fig. 9) are composed of a thick muscular basal part, from 

 the end of which originate two slightly incurving masticatory lobes, and of a peculiar 

 recurved palp. The outer masticatory lobe is of rather firm consistency and a little 

 narrowed towards the tip, which is truncated and armed with strong spines forming a 

 double row, besides a few very small bristles. The inner lobe is much shorter and of a 

 more membranous nature ; its tip is narrowly rounded, and bears four curved spines, the 



