REPORT ON THE SCHIZOFODA. 175 



The carapace is remarkably small, so as to cover only the anterior part of the trunk, 

 whereas the two posterior segments of the latter are exposed behind it around the whole 

 of their circumference. Moreover, the lateral wings of the carapace, in the specimen 

 examined, were greatly inflected or doubled over, and thus the lateral paiis of the two 

 preceding segments also appear uncovered inferiorly. The carapace exhibits a well- 

 marked cervical sulcus, behind wliicli the linguiform dorsal area is distinctly seen. The 

 frontal margin is truncate, with but a very small dentiform projection in the middle (see 

 fig. 2) as a rudiment of the rostrum. The antero-latcral corners of the carapace are 

 narrowly rounded. 



The caudal segments are simple cylindrical, without any trace of epimera, the anterior 

 ones differing but slightly in size and appearance from the two posterior segments of the 

 trunk. The last segment, on the other hand, is rather elongate, about as long as the tAvo 

 preceding ones taken together. 



The eyes (fig. 3) are cj^uite rudimentary, without any trace either of pigment or visual 

 elements, constituting merely two thin and pellucid lomellfe, of an oblong form, and 

 mounted on very short and narrow pedicles. They would seem to a certain extent 

 movable, and, in the specimen examined, were directed upwards, with their inner faces 

 parallel to each other and to the axis of the body. 



The antennular peduncle (see figs. 1, 2) is very slender and elongate, nearly^ 

 ecjualling the carapace in length, and has the basal joint longer than both the others, 

 taken together. The last joint is rather small, and does not exhibit any trace of the 

 hirsute lobe, usually met with in male Mysidans. The fiagella are shorter than the 

 peduncle, well-nigh uniform in structure and length, and composed of several short 

 articulations. 



The antennal scale (figs. 1, 2, 4) projects but slightly beyond the basal joint of the 

 antennulse, and exhibits a very narrow lanceolate form, the edges being densely setiferous 

 all round. The tiagellum is most imperfectly developed, and totally wants the terminal 

 part, constituting, as it does, merely a short biarticulate stem, corresponding to the 

 basal portion or peduncle in other Mysidans. This stem scarcely reaches to the tip of 

 the scale, and is provided with a dense tuft of apical bristles. 



The mandibular palps being, according to the statement of the late Dr. v. Willemoes- 

 Suhm, of quite normal appearance in the female, exhibit in the male (see fig. 1) a truly 

 remarkable development, jjrojecting, as they do, in the form of a pair of very powerful 

 limbs far beyond the antennular peduncles. Their middle joint is by far the largest and 

 strongly muscular, and also furnished along the lower edge with numerous tufts of small 

 bristles. The last joint is sharply reflexed, forming along with the preceding joint a 

 geniculate bend, and is armed with seven strong unguiform spines, three of which spring 

 from the apex, and two from each of the edges. These limbs serve in all probabilitj- as 

 powerful prehensile organs, by the aid of which the male cla.';ps the female dui'ing 



