REPORT ON THE SCHIZOPODA. 67 



more especially along the inner edge. The exognath, too, is very small, forming 

 simply a slight lamellar expansion of the outer edge of the basal part, and fringed 

 with a row of short, densely ciliated, bristles. The proximal portion of the basal part 

 forms a thick muscular segment, with the outer edge somewhat cui-ved, and in some 

 species furnished with a few bristles of a similar appearance to those affixed on the 

 exognath. 



The maxillipeds (PI. XII. fig. 14) ai'e quite pediform in structure, and only to a very 

 slight extent differ from the succeeding true legs ; hence they have generally l)een 

 described by earlier authors as the first pair of legs. They consist of seven distinctly 

 defined joints, of which the two proximal correspond to the basal part of the maxillse, 

 whilst the others represent the palp. The first, or coxal, joint projects inwards into a 

 linguiform setose lobe (masticatory lobe), and in addition to this bears on its external 

 surface a very small, simple epipodite, corresponding, as regards location, to the gills on 

 the true legs. The second, or basal, joint is rather broad and compressed, exhibiting, 

 on the outer side, a distinctly developed natatory branch (exopodite) of precisely the same 

 appearance as the exopods on the legs. The ischial joint is somewhat broad, but gradually 

 tapers towards the apex. The meral joint is much more elongate and .slender, and forms, 

 in conjunction with the carpal joint, a rather mobile articulation, the outer part of the 

 maxilliped being generally, as in the legs, recurved almost at right angles to the 

 remaining part. The propodal joint is somewhat larger than tlie carpal, without, 

 however, attaining to anything like the length of the meral joint, and exhibits a linear 

 form, precisely as in these joints. The terminal joint, finally, docs not difi'er essentially 

 from the preceding joints, save that it is a trifle shorter ; it has, too, a row of short simple 

 bristles (see fig. 15) along its inner edge, besides two or three longer ones. All the 

 preceding joints are fringed along the inner edge, with a double series of delicate bristles, 

 those of the inner row being very long and lieset on both edges with small and somewhat 

 widely placed hairs. On the ischial and basal joints these bristles become shorter and 

 more numerous, assuming an almost spiniform character. 



The first pair of legs (fig. 16) exhibit a very similar structure to that of the 

 maxillipeds. They are, however, a little longer, and have the terminal joint (fig. 17) 

 somewhat dilated and compressed. Each leg is also furnished at the inner edge with a row 

 of peculiar curved spines, densely crowded together, as well as a series of short ciliated 

 bristles. The inner lobe of the coxal joint is much swollen, and contains within a well 

 developed luminous globule. The epipod, too, has assumed the character of a true gill. 

 The exopod in this and the succeeding pair consists, as does the exopodite of the maxilli- 

 peds, of a muscular basal portion, and a lanceolate, compressed terminal part, fringed with 

 strong natatory setae ; the articulation between the two parts is very oblique, the basal 

 portion jutting out exteriorly at an acute angle. 



The second pair of legs (fig. 18) are a trifle longer than the first pair, and only difter 



