FROM THE IXLAND SEA OF JAPAN. 425 



two pairs of spinules. The uropods are little longer than the telson and carry no movable 

 spine at base. 



The stout eye-peduncles reach a little beyond the middle of the first joint of the 

 antennular peduncle. The internal antennae are, in the largest specimen, 38 mm. long, 

 a little longer than the body ; the peduncle agrees with Spence Bate's description and 

 figure of Nautlc. unirecedens ; the sharp-pointed basal spine or stylocerite reaches barely 

 beyond the eye-peduncles ; the second joint is half as long as the first and twice as long 

 as broad, tlie third half as long as the second. The two flagella, however, which are 

 just as long as the body, do not agree with the figure in the ' Challenger ' Report, nothing 

 is said about them in the text, and, as is shown above, they are lost in the type specimen 

 in the British Museum. I suj)pose, however, that they have been wrongly figured in the 

 Report. These flagella are of equal length, filiform, but the outer one is slightly 

 thickened at its base for a short distance (4'5 mm.), which is a little shorter than the 

 peduncle, and this thickened part is beset with olfactory setse. 



The outer antennae are as long as the inner ; the basal joint of the peduncle, which 

 reaches midway between the tip of the eye-peduncles and the distal end of the first joint 

 of the antennular peduacle, carries a small spine at its outer angle; the flagella, 36 mm. 

 long in the adult females, are a little longer than the body. The antennal scales barely 

 narrow distally, and the small spine which terminates the slightly concave outer margin 

 reaches barely beyond the truncate tip. 



The pediform external maxillipeds project with half their terminal joint beyond the 

 antennal scales ; the exopodite reaches a little beyond the middle of the antepenultimate 

 joint. 



The legs of the first pair extend to the extremity of the antennal scales. The carpus is, 

 in the adult, a little shorter than the chelae, but slightly longer than the palm, that is 

 once and a half as long as the fingers ; the latter gape a little along their proximal half. 

 The elongate, filiform legs of the second pair project with their small chela and the last 

 joint of their carpus beyond the distal extremity of the basal thickened part of the outer 

 antennular flagella. The carpus is composed of 22 joints ; the penultimate joint is 

 0'3 mm. long, those in the middle are slightly longer, viz. 0"36 mm., and the last joint 

 is twice as long as the penultimate. The chela, 1-22 mm. long, is twice as long as the 

 last joint of the carpus, and the palm is a little longer than the fingers. 



The three other legs apparently agi*ee Avith those of the ' Challenger ' specimen of 

 Xautic. unirecedens. The meri carry on their outer surface a few movable spinules, 

 those of the third pair, e. g., five ; the propodites carry similar spinules along their 

 posterior margin in two rows, those of the third legs seven pairs ; the dactyli, finally, 

 measure, in the legs of the third pair, one-fourth of the propodites and are armed with 

 six spines along their posterior margin, which gradually increase in length, the last being 

 the terminal claw. 



Tlie eggs are very numerous, ovate, 06 mm. long and 0*4 mm. broad. 

 I am indebted to Prof. Heller, of Dresden, for having been enabled to examine the 

 single type specimen of Thallwitz's variety subtilis from Cebu : it proved to differ from 

 our specimens only by its smaller size. 



