.j,10 DE. J. G. D£ MAN ON CEUSTACEA CHIEFLY 



As usual, Dr. Ortmann has not indicated the length that this species attains : the 

 present female is 58 mm. long from tip of rostrum to the end of the telson. The 

 carapace is just half as long, viz. 29 mm., the rostrum included, and 11 mm. without it. 

 The slender, elongate rostrum, which reaches with somewhat less than half its length 

 beyond the antennal scales, is strongly recurved and about once and a half as long as the 

 carapace. Different from Leander pacificus, Stimps., L. serratus, Penn,, L. treillianus, 

 E^isso, and other species, the rostrum is hardly broadened at the level of the first tooth 

 of the lower margin, so that it appears stiliform and not emarginate at base. As 

 in Ortmann's typical male specimen from the Sagami Bay, the third tooth is placed 

 immediately before the anterior margin ©f the carapace, the first two teeth standing 

 upon it ; the third tooth is followed by four other teeth, the first six are equidistant, 

 but the seventh, which is placed just on the middle of the uptm-ned part of the rostrum, 

 is a little farther from the sixth than the sixth from the fifth. The seventh tooth 

 is a little smaller than the preceding. As in Ortmann's specimen, there are three apical 

 teeth, which are smaller than the preceding ; the first apical tooth, i. e. the eighth of 

 the whole series, is as far distant from the second as the third apical tooth from the 

 tip. The first apical tooth is a little farther from the seventh tooth than the seventh 

 from the sixth. The first tooth stands immediately before the middle of the carapace, 

 and the fifth is situated above the distal end of the basal joint of the antennular 

 peduncle. As in the typical male, the lower margin carries eight nearly equidistant 

 teeth, of the same size as those of the upper border; the first is situated just below the 

 fifth, the eighth just below the eighth of the upper margin, *. e. the first of the three 

 apical teeth. 



As was rightly observed by me in 1881 {I. c), the branchiostegal spine, which is a little 

 remote from the margin of the carapace, is distinctly smaller than the antennal. The 

 abdominal segments are rounded. The telson (PI. 32. fig. 26), once and a half as long as 

 the sixth segment, gradually tapers backward and ends in a sharp tooth ; of the lateral 

 spinules the outer, 0-34- mm. long, are a little shorter than the median tooth, but the 

 elongate slender inner spinules are four times as long and reach far beyond the latter 

 (fig. 27). There are two pairs of spinules on the upper surface as usual. 



The short flagellum, as long as the antennular peduncle, is united for one-fourth its 

 length with the outer ; 10 or 11 joints are grown together. 



The external maxiUipeds reach with their terminal joint beyond the antennal 

 peduncle. 



The legs of the first pair are as long as the scales ; the carpus is almost twice as long 

 as the chela, and the fingers are a little longer than the palm. 



The legs of the second pair are unequal, the much longer right leg (fig. 28) reaches as 

 far forward as the rostrum, the other only to the end of the antennal scales. The carpus 

 of the right leg, 5"7 mm. long, is almost as long as the merus (6 mm.) ; the carpus, 

 05 mm. thick at the proximal end, is 092 mm. broad at the distal extremity, here thus 

 twice as thick. The chela, 8"35 mm. long, is almost 07ice and a half as long as the 

 carpus, and also longer than the merus. The palm, a little shorter than the fingers, is 

 distinctly Iroader than the distal end of the carpus, and its upper surface is about 



