157 



cross-shaped very small area. Close behind the peduncle of the disk, the lateral margin of 

 the elongated front is provided with a low. longitudinal keel (fig. 3h, y), which bears a row 

 of rather short setaceous processes. The antennulae are short, without distinct articulation, 

 very sinuous in outline, and most sparingly provided with setae; one of these is a peculiar 

 olfactory seta, placed at some distance from the apex, on the posterior side. Antennae 

 wanting. Mouth-border rather narrow. Maxillulae somewhat larger than in the female, 

 without additional branch. Maxillae small and constructed like those of the female, except 

 the third joint, which is pointed. Basal joint of the maxillipeds long and somewhat slender, 

 on their anterior side proximally decorated with areas and nxws, partly of minute prickles, 

 partly of very short hairs, distally provided with several transverse rows of somewhat longer 

 hairs; second and third joints coalescent, last joint essentially as in the female. The sub- 

 median skeleton with the two first pairs of processes conspicuous; the first pair (i) of medium 

 size, triangular and situated a little behind the base of the maxillae; the second pair(j), which 

 are placed inside the base of the maxillipeds, are moderately long, shaped like narrow cones 

 and strongly diverging. The lateral margin of the head essentially like that of the species 

 which live typically on Amphipoda; in its whole length, from a point somewhat in front of 

 the base of the antennula, furnished with long hairs ; off the base of the maxilla, and before 

 reaching the posterior end of the lateral margin, the outline of the hair- coat runs upward 

 and slightly forward on the side of the animal till, on the middle of the side, it turns 

 backward, then again continuing straight upward across the back, in a line with the posterior 

 end of the lateral margin (fig. 3 i). Sides and back of the trunk closely covered with 

 proportionally long hairs; the central and posterior part of the ventral surface covered with 

 hairs of medium length, while basally, and for a part, sub-laterally, it is quite or almost 

 naked. Trunk-legs and caudal stylets altogether wanting. 



OVISACS. They are middle-sized in proportion to the females, but here I have 

 met with the peculiar fact that the smaller ovisacs with few eggs, represented in fig. 3e, 

 have been laid by the small female drawn in fig. 3 a, whereas the larger ovisacs, each 

 containing several more eggs, enlarged on the same scale and represented in fig. 3 e, have 

 been laid by the large female drawn in fig. 3d. The eggs are comparatively large. 



LARVA. A free specimen (fig. 3k) is 21 mm. in length. The cephalothorax is an 

 oblong oval (the length in proportion to the breadth is as 13 : 8). It can be distinguished 

 from the other species by the decoration of its front: there are no naked lists, but from one 

 antennula to the other, with only a very short central interruption, runs a transverse curve 

 of fine processes; on the sub-median part of the front the anterior ends of the processes 

 are decidedly a little removed from the frontal margin, whereas in the more lateral part, 

 they almost reach the margin, and this is due to a break in the transverse curve just in 

 the middle between the median line and each antennula, so that the sub-median processes 

 recede a little. The olfactory seta of the antennulaj is extremely long, nearly as long as 

 the cephalothorax and, when turned backward, reaching the middle of the abdomen. Antennae 



