[73 J DECAPODA FROM ALBATROSS DREDGINGS. 417 



anteunal scales : the merus is about twice as long as the carpus and 

 about as long as the propodus, which is very slender, composed of 

 about ten segments, and armed, like the ischium, merus, and carpus, 

 with exceedingly long, and for the most part simple, setiform spines, 

 and at the proximal extremity with a tuft of serate setss, corresponding 

 to a similar tuft on the distal extremity of the carpus ; the dactylus is 

 very minute, but perfectly distinct, and armed with an exceedingly long 

 and slender spiniform seta, while the tip of the propodus is armed with 

 a very much shorter spine. The second perseopods reach to about th& 

 tips of the second guathopods : the merus is a little longer than in the^ 

 first ; the carpus twice as long as in the first and only a little shorter 

 than the merus; the propodus is longer than the merus, composed of 

 about twelve segments, and armed very nearly as in the first, except 

 that the tuft of setae at the proximal extremity, with the corresponding 

 one on the carj^us, is wholly wanting, while the digits of the well-de- 

 veloped chela (,Fig. 4) are considerably longer than the diameter of the 

 l)ropodus at their base, slender, nearly straight, and armed at the tips 

 with a dense brush of setse, most of which are serrate. The third 

 perfBopods are almost exactly like the second, except that they are con- 

 siderably longer, reaching by the second by about half the length of 

 their dactyli. The fourth perseopods reach by the middle of the auten- 

 nal scale, are very much stouter than the third pair, and the endopods 

 are composed of only four segments each, the dactylus, apparently, be- 

 ing wanting : the ischium, carpus, and propodus (or the proximal and 

 the two distal segments) are subequal in length, while the merus (or 

 antepenultimate segment) is about once and a half as long as each ot 

 the others : the merus is about six times as long as broad, and, like the 

 ischium, densely ciliated along both edges, but the cilia on the lower 

 edge are several times longer than those upon the upper, which are not 

 as long as the breadth of the segment ; the carpus is slightly broader 

 than the merus, being more than a fourth as broad as long, ciliated like 

 the merus along the lower edge, but the upper edge naked y the pro- 

 podus (or ultimate seguient) is a little less than a fifth as broad as long, 

 ovate at the tip, and has the lower edge ciliated and the upper naked like 

 the carpus. The fifth perasopods are a little more than half as long as 

 the fourth, and their endopods are composed of the same number of seg- 

 ments : the ischium and carpus are subequal in length, the merus is a lit- 

 tle longer and the propodus a little shorter, and all the segments are cili- 

 ated along both edges, though the cilia upon the lower edge are much 

 longer than those upon the upper ; the merus is about a fourth as broad as 

 long, and considerably broader than the ischium or carpus ; the carpus 

 is less than a fourth as broad as long, and slightly tapered distally ; 

 the propodus is a little less than a fifth as broad as long, and regularly 

 tapered from near the base to the acute tij). 



The pleon, excluding the telson, is nearly twice as long as the carapax 

 along the dorsal line, is considerably compressed, though anteriorly 

 about as broad as the carapax, and, like the carapax, rounded above, 

 S. Mis. 46 27 



