FROM THE INLAND SEA OP JAPAN. 415 



length of the carapace from its anterior border ; it is stlUform, very little dilated at the 

 level of the first tooth of the lower margin (PI. 32. fig. 37), and tapers gi'adually to the 

 acuminate tip. The upper margin, T\iiich is somewhat arched above the eyes, whereas 

 the anterior half is gently ascending, is armed with 7 rather low teeth, two of which are 

 on the carapace ; these teeth, which reach to the middle of the free portion, grow gradually 

 somewhat longer, so that the two anterior, which are of equal length, are longer than the 

 preceding. The lo^^er margin is armed with 10 teeth, of which the first is small and 

 situated below the fifth of the upper margin ; these ten teeth increase also in lengtli 

 from the first to the last, and reach to the tip of the rostrum (fig. 36). Two-fifths of the 

 rostrum extend beyond the anteunal scales. 



Antennal spine small ; supraorbital and pterygostomian spines wanting. 



The abdomen is moderately geniculated, the upper border of the defiexed part making 

 an angle of 45° with the remainder. The third segment is slightly produced into an 

 obtuse lobe posteriorly. The fourth and fifth segments are of suhequal length ; the 

 postero-lateral angle of the fourth is obtuse, but that of the fifth terminates in a sharp 

 tooth. The sixth segment (fig. 39), almost twice as long as the fifth, is twice as long as 

 broad, and its postero-lateral angle is sharp. The slender telson, almost one-fourth longer 

 than the preceding segment, tapers gradually, so that the posterior margin measures but 

 one-fourth its breadth proximally ; the posterior margin (fig. 40) ends in the middle in 

 a sharp tooth, and of the two spinules on either side the outer are twice as long as the 

 inner. The upper surface carries four pairs of spinules ; the anterior pair are as far 

 from the base; of the telson as the posterior pair from the posterior border. The uroi^ods 

 are barely longer than the telson. 



There is a distinct ocellus near the cornea, and the rather slender eye-peduncles 

 project their whole terminal joint beyond the carapace when they are directed transversely 

 outward. 



The peduncles of the internal antennae, measuring little more than one-fourth the 

 length of the rostrum, reach not quite to the middle of the antennal scales ; the acuminate 

 stylocerite reaches to the distal end of the first joint. The second and third joints 

 are together half as long as the first; the second, which is once and a half as long as 

 thick and twice as long as the third, is armed at its antero-external angle with a strong 

 spine ; the thickened outer flagelluni roaches to the distal third of the sailes, whereas 

 the thin inner tlagellum reaches slightly beyond them. 



As in other species, there is a spine on the distal border of the lower surface of the 

 basal joint of the outer antennae. The scales are narrow, elongate, their outer margins 

 straight ; the membranous portion (fig. 41), which extends considerably beyond the strong 

 spine, is obliquely truncate. The antennal peduncle reaches as far forward as that of 

 the inner antenna-, the flagellum measures two-tliirds the length of the body. 



The external maxillipeds are very short, barely reaching to the end of the antennal 

 peduncles ; they seem to be devoid of an exopodite and an epipodite. 



The legs of the first pair, still shorter, project with their fingers, which are half as long 

 as the palm, beyond the basal joint of the antennal peduncle. The legs of the second 

 pair extend with their chelae beyoud the antennal peduncle. The carpus, once and a half 



