272 Messrs. J. Wootl-Masoii <intl A. Alcock on 



lateral outstanding spine larger than the rest. In the last 

 of these legs the third joint is fixedly united to the fourth, 

 the division between tlie two perfectly retaining its primitive 

 distinctness ; in the second the union is more perfect, but the 

 division may be readily made out on the inner side ; while in 

 the first the union is more perfect still, and the primitive 

 distinctness of the parts is scarcely traceable ; so that the 

 fusion of the two joints in question becomes more and more 

 ])erfect as we pass from behind forwards until at last it is no 

 longer possible to distinguish them. The compound joint is 

 curved, like its predecessors in the series, to fit the convex 

 ventral surface of the thorax. Their terminal joint forms a 

 stoutish curved and acuminately-pointed claw. There is no 

 trace either of epipodites or of exopodites on ^ny of the legs. 



The protopodites of the abdominal appendages are long, 

 being more than half the length of the rami in the first pair, 

 and less than half their length in the succeeding pairs. The 

 apical half more or less of their carinated outer margin is 

 armed with small spines, which increase in length towards 

 the apex, near to which there is usually a single spine that is 

 much larger than the rest. Near their base on the posterior 

 face a transverse suture divides them into a long distal and a 

 ijhort and incomplete proximal joint. Their rami are all 

 long-lanceolate and undivided membranous plates, with the 

 exception of the inner ramus of the first pair; this is in both 

 sexes only about one third the length of tiie outer and is 

 pyriform or obclavate in outline; flat and flexible and fringed 

 with setffi on both edges in the female, it ap[)ears convex and 

 btitf and glabrous and somewhat subulate or acuminate in the 

 male, owing to the apical half more or less of its edges being 

 lolded up into a sort of tube, and owing to the fringe of its 

 outer margin being reduced to short and simple setffi ; the outer 

 ramus of the first pair is in both sexes narrower than either 

 of the rami of the succeeding j)airs. In the appendages of the 

 second to the fiitli j)airs inclusively the inner ramus is shorter 

 and narrower than the outer, and is turnisiied near its base on 

 the inner side with a short cylindrical appendix interna, pro- 

 vided at its apex with minute liooks for attachment to its 

 lellow of the ojiposite side. In the second pair in the male 

 there arises from the iinier ramus, in front of antl slightlv 

 internal to the aj)jicndix interna, a tapering finger-shaped 

 opiiendix mai<cuUi<a, and the second joint of the protopodite 

 is subdivided by a false joint into two approximately equal 

 parts. 



The rami of the sixth j)air of abdominal appendages are 

 fivudy chitinized, rigid, oval platcc, the outer almost twice the 



