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these appendages, to be the first pair of trunk-legs, the lateral legs would then make the 

 second pair. The proximal part of the first pair of trunk-legs being incomprehensible to 

 me, I must content myself with referring to fig. 2g, which is drawn as accurately as pos- 

 sible; the distal part is a rather short and broad joint divided at the posterior outer angle 

 by a rather deep incision into two unequal processes, the outer one of which is conical and 

 ends in a shorter seta, while the inner one is broader and is cut off posteriorly in a straight 

 line, bearing on its end a small joint which terminates in a pretty long seta, of more than 

 half the length of the basal joint of the maxilliped. The second pair of legs resemble the 

 distal part of the first pair, but their outer process (outer branch?) is shorter, with the terminal 

 seta somewhat longer, the inner process lacks the small joint, whereas its seta is a little 

 shorter than in the first pair of legs. Each of the caudal stylets is a tap ending in a pair 

 of conspicuous, though not long, setae, besides having a short seta proceeding from an angular 

 expansion on the outside at the base; each stylet is a direct prolongation of a long, anteriorly 

 somewhat expanded, prominent list, which runs forward towards the base of the trunk. The 

 caudal stylets, the distal part of the first pair of legs and the second pair of legs are situated 

 almost on the same transverse line. 



OVISACS. They are pretty small, mostly somewhat flattened, their circumference 

 varying between a circular and a very oval shape ; the specimen represented in fig. 2 c is 

 •72 mm. long and scarcely more than half as broad. As many as fifteen ovisacs may be 

 found in one female. The eggs of medium size, not numerous. 



LARVA. The body of a specimen (fig. 2i) which had just attached itself, is -25 mm. 

 in length. It deviates very much from all the other known larvae of the genus, and partly 

 of the family, in its extremely short antennae, its long and very slender maxilla? and maxilli- 

 peds, its slender natatory legs and very slender abdomen. The front without lists, in the 

 specimen figured it is covered throughout its whole breadth by the viscous substance which 

 attaches it to the host. Antennulae 2-jointed, olfactory seta rather long, about three fourths 

 the length of the cephalothorax. Antennae extremely short, almost rudimentary, 3-jointed, 

 with a proportionally thick, but very short, seta on the penultimate joint, and an exceedingly 

 short terminal seta. Mouth very large. Of the maxillulae I have discovered three very fine 

 branches, the anterior one moderately long, the two others a little shorter. Maxillae long 

 and very slender, the basal joint, in particular, is comparatively very long and extremely 

 slender; all joints smooth. Basal joint of the maxillipeds long and very slender, second 

 joint unusually long, and considerably longer than the third one. The posteriorly free pouch 

 on the ventral side of the cephalothorax small and very short. The second section, the free 

 segment, of the cephalothorax proportionally much smaller than in other species. Peduncle 

 of the natatory legs unusually slender. Abdomen considerably more slender than in other 

 species; the long seta projecting from the posterior angle of the first segment, is more than 

 double the length of that part of the abdomen which is posterior to the point where this 

 seta projects, the second somewhat shorter seta is also unusually long. Second segment a 



19* 



