662 THE VOYAGE OF H.M.S. CHALLENGEE. 



origin, the fifth and sixth equal to the fifth and fourth of the peraeon ; the lower hinder 

 ano-le rounded in the first segment, squared and minutely produced in the second and 

 third segments, of the pleon. 



Eyes, apparently none. Some pigment-flecks in the ocular region, probably having 

 nothing to do with vision. 



Upper Antennse. — First joint short, tumid ; second and third together subequal to 

 first; flao-ellum of fifteen joints, first tapering, as long as the first of the peduncle, with 

 a not very dense brush of cylinders, the second short, with a long, straight spine at its 

 end, the following joints quite small, longer and ver}- slender towards the end of the 

 flao-ellum ; secondary flagellum of three slender joints, together equalling the first four 

 of the primary. 



Lower Antennie. — First three joints very small, the gland-cone not very prominent, 

 third joint triangular, fourth joint the longest, but not long, dilated near the middle ; 

 fifth joint shorter and thinner, dilated distally ; flagellum of about forty joints, the later 

 ones becoming long and thin, the earlier being very short, except the first, which has the 

 appearance of containing some ten or a dozen rings in preparation to become joints. 



Mandibles almost exactly as in Cyphocaris micronyx, the trunk massive, the great 

 palp fixed far forward over the prominent molar tubercle, the secondary plate on the left 

 mandilile having six teeth. The palps were destitute of spines, but probably only by 

 accident, as the inner new growth showed traces of them. 

 Lower Lip, forward lobes rather broad. 



First Maxillse, not conspicuously difi"erent from those of Cyphocaris micronyx. The 

 same remark applies to the second maxillae and to the maxillipeds. 



First Gnathopods. — Side-plates very small, rounded below ; first joint longer than 

 the rest of the leg, lower half a little dilated ; second joint very small ; third short, 

 triangular ; wrist a little furred Ijehind, scarcely as long as the hand, but thicker where 

 distally dilated ; on the lower hinder angle three spines pectinate on two edges of the 

 distal half; hand narrowing distally, almost all the hinder margin, including the palm, 

 microscopically pectinate, most of the palm more finely than the rest of the margin ; 

 besides cilia and pectinate setules, there are on the palm margin three sjiines, one very 

 slender marking the beginning of the palm, a second rather stouter, with an accessory- 

 thread, a third shorter, with the hind margin minutely pectinate ; finger with inner edge 

 denticulate, having a larger tooth and cilia some way short of the nail. 



Second Gnathop)ods. — Side-plates very small, narrowed below ; first joint shorter 

 than that of first gnathopods, a little bent ; second joint as long as the wrist ; third joint 

 short ; wrist longer than hand, with some setiform spines near the lower hinder angle ; 

 hand narrowed distally, furred, set with some spines and cilia; finger small, with a process 

 antagonistic to the over-arching naU, cilia being set in the cleft bet-ween the nail and the 

 process. 



