riiOM THE INLAND SEA OF JAPAN. 



413 



The legs of the first pair, whicli barely reacli to the end of the scales, can hardly 

 be described as " graciles," as they were by Stimpson. The merus, 3-1 mm. long, 

 is nearly three times as long as broad and carries on its lower border proximally six or 

 seven small, movable spinules and some plain setie ; the latter are also observed on the 

 lower border of the ischium. The carpus, half as long as the chela, is somewhat 

 excavated distally. The chela is little longer than the merus, and the fingers, which 

 shut close together, measure one-third its whole length. Unfortunately, the right 

 leg of the second pair is wanting, tbe left reaches to the end of the scales. The carpus, 

 which was not described by Stimpson, is 3 mm. long, and seems to be composed of 

 six joints ; the first is a little longer than each of the following and the fifth is the 

 shortest. The chela measures little more than one-third the carpus, and the fingers 

 are half as long as the palm. 



The legs of the third pair reach to the end of the scales, the following are a little 

 shorter. The meropodites of the third and fourth pairs (the fifth pair are wanting) carry 

 on their outer surface four or five movable spines, whereas their lower margin, like 

 that of the ischium, is furnished with tufts of setae. 



The three posterior legs are marked with blue rings. 



The oblong eggs are very numerous and small,s0'6-0-65 mm. long, 04-0-45 mm. broad. 



If the other specimen be really the male of Spiront. rectirostris, the sexual differences 



are considerable: Stimpson apparently observed only the female, though he does 



not mention it. This specimen is 345 mm. long from tip of rostrum to the end of 



the telson, presenting the same size as the female, but the abdomen is less deep and 



appears therefore slenderer. The carapace is 12-5 mm. long, a little longer in proportion 



to the whole length than in the female. The rostrum, which just reaches beyond the 



distal end of the antennular peduncles for about 075 mm., projecting straight forward, 



arises more anteriorly than in the female, viz., at one-third the length of the carapace 



from its frontal border ; the upper margin is armed with six teeth, which are of equal 



size and equidistant, and only two of them are placed upon the carapace. The upper 



margin appears between the most anterior tooth and the extremity of the rostrum 



somewhat convex, different from the female. As in the latter, the rostrum is dilated and 



just below the foremost tooth and the lower edge carries here also two teeth, which are 



much smaller than those of the upper margin ; the second of these is as far distant 



from the tip of the rostrum as from the first. The antennal spine and the pterygo- 



stomian spinule agree with those of the female. 



The third segment of the abdomen resembles that of the female, but the two 

 impressed lines on the tergum are wanting. The fifth segment appears a little shorter 

 in proportion to the fourth than in tlie female, the fourth being once and a half as 

 long as the fifth ; the sixth segment appears therefore twice as long as the fifth, but it 

 is only once and a half as long as broad. The postero-lateral angles of the fourth, fifth, 

 and sixth segments terminate in a sharp spinule. The telson, almost once and a half 

 as long as the sixth segment, agrees with that of the female, but the four pairs of 

 spinules reach farther backward, so that the most posterior pair is farther from the 



59* 



