(52 HIK. A. O. WALKEK ON AMPITIPODA 



joints ; the 3rd as long as the next three ; the 4th shorter than 

 the 5th, which has tufts of seta) on botli sides. 



Third perreopods : first joint oblong, hind margin almost 

 straight and scarcely produced downward, 2^osterio)' angle 

 rounded; 3rd joint enlarged. 



Fourth and fifth pera^opods ratlier longer than the 3rd, the 

 2)Oster/or angle oftlie \st joint i^'oduced doivnwards in a suhacute 

 angle. 



First and second uropods : peduncles longer than the rami ; 

 iimer rami longer than outer ; peduncles and rami s|)inous. 



Third uropods reaching to the end of the shorter ramus of the 

 2nd uropods ; peduncle about four times as long as the inner 

 ramus, with a close transverse row of small spines on the upper 

 side and a group of larger spines at tlie inner angle at the distal 

 end ; inner ramus almost straight, with a microscopic spine near 

 (lie tip; outer much curved and twisted, rough with minute 

 denticles, and a minute excavation witli a forked setule near 

 the point, hit ivitJiout secondari/ teeth. 



Telson \0Yy short, triangular, acuminate, a seta at each side of 

 the point. 



Length 20 mm. Colour in spirit olive-green. 



The only diftcrcnce I have observed between male and female 

 in this species is that the propodos of the 2ud gnathopod is 

 slightly smaller in the female. Even in the very young, under 

 3 mm. long, this limb has the same form and proportion to the 

 body as in adults. The third uropods agree rather with those of 

 Janassa, Boeck (Parajassa, Stebbing), while the anteunas resemble 

 those of Jassa. Should it be thouglit desirable to form a 

 new genus on this account, I suggest the name of Hemijassa, 

 because of its intermediate character. 



I have received from Mr. J. A. Clubb a specimen of this species 

 f oiuid among the tentacles of a sea-anemone ( Urticina Garlgreni, 

 Clubb), described by Www in the Brit. Mus. Report on the 

 ' Southern Cross ' Collection, p. 299, and considered by him to 

 be a commensal. I suggest iliat, as it appears to be an abundant 

 species, the specimens so found may have been accidentally 

 entangled in the tentacles while in the dredge. 



