new Decapod Crustacea. 403 



Botli pjiirs of antennaj closely reseinlilinf] those of Cr. vul- 

 fjnri's. AiitcMinal scalo ineasurin;^ two thirds the length of 

 the carapace without the rostrum and two and a half times as 

 lonjj as broad ; end of the blade slightly roundcfl, making a 

 distinct angk; with the inner margin, and four times as broad 

 as the contiguous part of the spine that reaches considerably 

 beyond it. Styloccrite of inner antcnnai a little shorter than 

 the first joint of the peduncle. 



External maxillipedes reaching to the end of the scales ; 

 the joints of the endopodite broader in proportion to their 

 length than those of Cr. vuhjaris. 



First pair of feet nearly reaching to tlie end of the scales ; 

 they are uf a stouter shnpH than those of Cr. vulgaris^ the 

 chelas two and a third times as long as broal, in Cr. vuhjaris^ 

 however, three times. Legs of the fourth and fifth pairs 

 differing from those of Cr. vulgaris by comparatively shorter 

 dactyl i and slenderer propodites. 



Length of egg-laden temale 4G"5 mm, 



Iidand ^Sea of Japan, deep water. 



Male (v/Spirontocaris rectirostris [Stimps.). 



lIi}>polyte rectirostris, Stimpson, Proc. Acad. Nat. Sciences Philadelphia, 

 IdOO, p. 33. 



Same size as the female, but abdomen less deep and there- 

 fore slenderer. Carapace longer in proportion to the whole 

 length than in the female. Rostrum arising more forward 

 than in the female, viz. at one third of the length of the 

 carapace from its anterior border; above with six teeth, of 

 equal size and equidistant, two teeth only on the carapace; 

 lower margin with two teeth as in the female; the rostrum 

 reaches a little beyond the end of the antennular peduncles. 

 Fifth segment of abdomen shorter in proportion to the fourth 

 tlian in the fenuile and the four pairs of spinules on the telson 

 reaching iarthcr backward. 



Antennal scales more elongate than in the female, measuring 

 one sixth the whole length, and a little more than three times 

 as long as broad. 



External maxillipedes much longer, tivi'ce as long as the 

 cai apace, rostrum included, and extending with the last two 

 Joints hvyoud the scales ; terminal joint ^m.s^ as long as the 

 <>th>r joints together^ much slenderer thati in the female. 

 Legs of first pair resembling those of the female, but much 

 Ltrger. 



Length 3'4"5 mm. 



2^* 



