1224 THE VOYAGE OF H.M.S. CHALLENGER. 



lat. 39° 4' S., long. 105° 5' W.; bottom temperature, 34°-4 ; while the other specimen 

 came from lat. 38° 7' S., long. 94° 4' W., the bottom temperature there being 35° - 3. 



Length, without the antennae, nine-twentieths of an inch, from the front of the head 

 to the extremity of the first uropods, the second uropods being broken, and the last 

 uropods missing. 



Remarks. — While the specimen from Station 295 was a female, the specimen from 

 Station 293 appears to be a male, and the difference of sex may account for certain 

 variations which might otherwise be regarded as of specific value. In the present 

 specimen there is a clearly defined, only slightly depressed, rostrum, with the convex 

 lateral margins meeting in a pointed apex ; the third joint of the mandibular palp is 

 not very elongate ; the first gnathopods have the wrist almost as long as the hand ; the 

 first and second peraeopods have a slight convexity of the hind margin of the fifth joint, 

 and the finger almost linear ; the peduncles of the first pair of uropods are considerably 

 longer than the rami. Should the foregoing differences be thought to require the 

 institution of a separate species, I propose for it the name Synopioidcs secundus. The 

 following particulars are in all probability common to both forms, although they were 

 not observed or could not distinctly be made out in the specimen first described ; the 

 third segment of the pleon is dorsally produced at the centre of the hind margin into a 

 short blunt tooth ; the fourth segment a little in advance of the hind margin has a 

 longer acute tooth or process, but the back of this segment being depressed along the 

 centre, a lateral view showing the raised outer margin and the projecting central 

 process gives a bidentate appearance to the segment. The maxillipeds have much 

 greater resemblance to those of Pardalisca (see PI. XCIII.) than, from their condition in 

 the first specimen, I was able to perceive ; the inner plates are a little less rudimentary 

 than in Pardalisca, but they are very small, conical, without spine-teeth, carrying 

 three setae, one of these being very long and planted on the apex ; there are also some 

 setae on the outer apex of the joint to which the inner plates belong; the following 

 joint is very large, with two setiform spines apart from one another on its outer margin ; 

 the outer plates where free from the basal part of the joint are small, not quite reaching 

 to the apex of the first joint of the palp, the outer margin smooth, the apical margin 

 carrying three spines at intervals, curved, graduated in size, the largest outermost ; the 

 inner margin has six slender spines distant from one another ; the first joint of the palp 

 is longer than broad, with smooth margins ; the second is about once and a half as long 

 as the first, with long, plumose spines or setae, not very numerous, on the inner margin ; 

 the third joint is about as long as the second, with setae on both margins, chiefly near 

 the distal end ; the finger is long and tapering, with a setule at the base of the nail ; 

 this description of the maxillipeds must be taken in correction of that given on p. 1001. 

 The triturating organs are of rather peculiar shape, narrow at one end and broad at the 



