40 THE VOYAGE OF H.M.S. CHALLENGER. 



their place being occupied by the roimded lateral expansions of the carapace to the sides 

 of the buccal area . 



Of the caudal segments, the five anterior ones are distinctly keeled along the middle of 

 the dorsal face, and jut out at the posterior margin into short jsosteriorly pointing spines. 

 The epimera are rather small, and the anterior lappet is almost obsolete, whereas the 

 posterior is somewhat produced and acutely pointed. The epimeral spines on the last 

 segment are comparatively small, and do not, as in the preceding species, unite on the 

 ventral face, being on the contrary, separated by a distinct interstice (see fig. 5). 



The eyes (fig. 3) are rather short and pyriform, the cornea being greatly expanded, 

 and occupying a considerable part of the eye. The ocular papilla is very small, and 

 placed about the middle of the pedicle. 



The antennulse (see figs. 1, 2) exhibit the usual structure, the peduncle being short 

 and thick, and the outer flagellum strongly developed, almost equalling in lengtli the 

 whole body. 



The antennal scale (fig. 4), on the other hand, does not show any resemblance to that 

 in the three preceding species, being more in accordance with the structure usually met 

 with in the Caridea. It is rather larg-e and oblono-ovate in form, about twice as Ions; as 

 broad, with the inner edge very considerably arched in its proximal part, the outer 

 almost straight, and running out into a strong, anteriorly pointing, spine. The terminal 

 part of the scale forms a linguiform lobe, projecting a little beyond the said spine, and 

 frinsjed throughout with a dense row of ciliated bristles, which is also continued alonof 

 the whole internal margin of the scale. From the base of the above mentioned spine, a 

 distinctly marked suture passes, in an obliquely transverse direction, across the scale, 

 dividing it into two segments, which to a certain extent will admit of being moved towards 

 each other, a fascicle of short muscles joining the suture posteriorly. 



The oral parts do not seem to exhibit any essential difference from those in the 

 preceding species, except that, as in all the species belonging to this section, the 

 maxillipeds are found wholly destitute of the exopodites. 



]\Ioreover, the legs and caudal limits are of a very similar structure. 

 The telson (fig. 6) is rather large, though perhaps less massive than in the three 

 preceding species, and exhibits a comparatively regular linguiform shape, the lateral 

 margins being evenly arched in theii- distal part, and armed -wdth numerous delicate 

 spiuules arranged in the usual manner. The apical spines are rather small, forming- 

 together, as in the other species, a crescent-like projection, finely serrate along the evenly 

 concave posterior margin. 



The uropoda (see figs. 1, 2), as in the other species belonging to this section, are 

 rather larger than in the three preceding ones, reaching almost to the tip of the telson, 

 when extended posteriorly ; tlieir structure, however, is very similar to that in the above 

 mentioned species. 



