REPORT ON THE SCHIZOPODA. 213 



The mandibles (fig. 6) are ^JOwerfuUy developed, Avitli the masticatory part consider- 

 ably expanded, and the cutting edges (fig. 7) exhibiting an armature similar to that 

 observed in most other Mysidans. The palp (see fig. 6) is longer than the mandible 

 itself, and has the middle joint largest, with a row of strong plumose setae along its outer 

 edge. Its terminal joint is lamelliform, and, besides a number of elongate setae, furnished 

 near the tip with a row of small spinules. 



The first pair of maxillae (fig. 8) exhibit quite a normal appearance. 



The second pair of maxillae (fig. 9) have the terminal joint of the palp rather large 

 and sharply incurved, oval in form, and furnished along the outer edge with seven 

 exceedingly elongate setas, the outer part of which is somewhat curved and quite naked, 

 whereas their proximal part is coarsely ciliate. The exoguath is comparatively small and 

 triangular in form, with about nine marginal set«. 



The maxillipeds (fig. 10) are rather strong, with the basal part jutting out at the end 

 interiorly as a small linguiform masticatory lobe. The joints of the endopodite are 

 comparatively broad and appressed, the last triangular, with, a strong apical spine. The 

 exopodite is much longer than the endopodite, but very slender, with the basal part 

 rather narrow and the terminal part composed of ten articulations. The epipodite, 

 finally, is unusually small and oval in form, with four bristles springing from its upper foce. 



The gnathopoda (fig. 11) are, as usual, more pediform in character, though difi"ering 

 considerably in appearance from the true legs. The endopod is rather elongate, with the 

 carpal and propodal joints largest and nearly ec[ual in length, as also very movably 

 jointed together. The terminal joint is very small and densely hirsute ; it is sharj)ly 

 incurved and exceedingly mobile, admitting of being bent in against the preceding joint. 



The legs (fig. 12) are very slender and elongate, increasing somewhat in length 

 posteriorly, and are furnished, too, with unusually strong plumose setae. The terminal 

 part is somewhat longer than the preceding (carpal) joint, and subdivided into three 

 distinctly defined and mobile articulations, besides the apical claw (fig. 13), which is 

 well develojied, though not particularly strong. Of the propodal articulations, the first is 

 by far the largest, in the anterior pair (fig. 12) about as long as the other two taken 

 together, in the jjosterior pair (fig. 14) still longer and much narrower. 



The marsupial pouch in the female would seem to agree in structure with that of 

 Mysis. 



The caudal limbs in the female (figs. 15, 16) constitute, as usual, simple, non- articulate 

 narrow plates, but are somewhat larger and more projected laterally than in most other 

 Mj^sidans. Moreover, their marginal setae are remarkably strong, and exhibit a very 

 peculiar ciliation, the cilia being disposed in dense verticils at regular intervals (see 

 fio-. 17). In the male all the limbs are natatory, with multiarticulate setiferous branches. 

 In the first pair (fig. 18) the inner branch is, as usual, rudimentary and non-articulate, 

 and would seem to lack the basal expansion. 



