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



has rounded spots of a darker colour than the rest of the surface, numerous on the 

 lower part of the first three pleon-segments, the third side-plates of the perseon and the 

 first joints of the last three perseopods, but scattered also elsewhere. 



Eyes meeting at the top of the head, roundish oval, the ocelli numerous. 



Upper AntennsB. — First joint thick, bent, longer than broad, longer than the next 

 two united ; second much thinner than the first, nearly twice as long as the third ; only 

 nine joints of the flagellum remaining, the first much broader than the rest, narrowing 

 distally, as long as the six following together, fringed with about four and twenty 

 cross rows of broad filaments ; the remaining joints carrying small filaments and setse 

 at difi"erent points of the margin ; the slender secondary flagellum almost hidden in the 

 bushy fringe of the first joint of the primary, serrate-edged, its first joint much longer 

 than the second, fringed on the one side with setse, on the other with spines, the narrower 

 second joint reaching the end of the first joint of the primary ; a small third joint is 

 broken. 



Loiver Antennse. — First joint a little expanded, second very short, third rather 

 longer, bent, fourth twice as long as the third, closely fringed above with setse ; fifth 

 considerably more than twice as long as the fourth, thicker near the base than distally, 

 fringed like the fourth joint ; twenty slender joints of the flagellum remaining, fringed 

 with setules. 



Upper- Lip) with the distal margin slightly convex, not incised. 



Mandibles. — The cutting edge as in Syrrhoe papyracea ; the secondary plate of 

 the left mandible with six teeth ; the spine-row showing three curved denticulate spines ; 

 the molar tubercle prominent, wedge-like, strongly denticulate, with a small seta at the 

 back ; the first joint of the palp short, bent forwards ; the second joint very long, with 

 the hind margin concave, the front margin convex, carrying six pairs of spines ; the 

 very small thiixl joint carrying six very long spines ; the muscles of the second joint 

 appear to run right through from the lower outer corner to the apical inner corner. 

 The cutting edge of the right mandible is figured in the Plate, not in profile, but flat, 

 from the outside, with the secondary plate showing through, and not very clearly discerned. 



Lower Lip> as in Syrrhoe papyracea. 



First Maxillm. — Inner plate fringed with about twelve plumose setse ; on the outer 

 plate the two innermost spines are long, slender, finely pectinate on the outer convex 

 edge, the three following are denticulate with from six to eight denticles, the three 

 furcate spines alongside of them have one arm of the fork much shorter than the other, 

 the remaining three are as in the preceding species ; the second joint of the palp is 

 twice as long as the first, and has three curved pectinate spines set round the apex and 

 six similarly ornamented setse on the inner margin. 



Second Maxillw appearing to be very similar to those of Syrrhoe papyracea, the 

 inner plate, however, broader than the outer. 



