226 G. M. Giles — Six new AonpJiipods from the Bay of Bengal, [No. 2, 



consist of three joints, of which the first is large and globular and filled 

 with a number of muscular bands, that are evidently capable of 

 moving its articulation with the second in all directions. It contains 

 also a small antennular gland. The second is extremely short, and the 

 third, which is pear-shaped, is provided, along its inferior border, with 

 a number of closely set exceedingly fine hairs. The flagellum consists 

 of between 20 and 30 long, narrow articulations, longest in the middle 

 of the organ, the first being exceptionally short. Each joint carries 

 two or three exceedingly fine hairs, and the last, a pair of blunt, cylindri- 

 cal hairs of uniform thickness throughout. 



The antenncd are shorter than the antennules, equalling in length only 

 the head, thorax, and first two abdominal segments ; and, like these, their 

 peduncles are three- jointed, the third joint being considerably longer than 

 the two first. The flagellum is also closely similar, but differs in the first 

 joint being long and conical, and in the armature of the terminal joint, 

 which is provided with a pair of bifid (or, possibly, four) tapering hairs. 



The dissection of the gnathites was attended with considerable 

 difficulty no less on account of their extreme minuteness than because of 

 their dense pigmentation, so that I am even now by no means satisfied 

 as to the exact relative position of the parts in this stage of the 

 animal. The mandibles (Fig. 6.) are stout and provided with a long 

 three-jointed naked palp. Their masticatory plate (shown separate- 

 ly in Fig. 7) is peculiarly well developed, being provided with several 

 rows of regularly arranged conical teeth. The maxillae are liberally 

 toothed and the maxillipedes have one of their lobes terminated by a 

 biramous jointed appendage. 



The second of the thoracic appendages is short and stout and pro- 

 vided with a somewhat incomplete subchela. The third, longer and 

 somewhat slighter, has the subchela very well developed, the opposable 

 prolongation of their carpopodites being distinctly hollowed out for the 

 reception of the cylindrical propodite. The remaining thoracic append- 

 ages are of the usual type, increasing regularly in size to the seventh, 

 which is largest ; the sixth and eighth being subequal. The eighth has 

 its posterior border provided with a strong buttress-like plate. Some 

 of the posterior thoracic appendages are provided with gill-sacs, but I 

 was unable to satisfy myself as to their exact number and position in 

 this stage of the animal, although they are probably identical with those 

 of the S^/peria-stage. 



The first three abdominal appendages are subequal, and on the 

 usual amphipod plan. The remaining three have long protopodites 

 and small equal rami, the first two being subequal, while the last is a 

 quarter shorter than the preceding two pairs. 



