1904] Description of Paracartia Gram. 5 



bined, and forming on each side a rather large lamellar expansion 

 obliquely truncated at the tip. Caudal rami pronouncedly asym- 

 metrical, the right ramus being considerably broader than the left; 

 marginal setæ comparatively short, the innermost but one on both 

 rami transformed, that on right side much stronger than that on left 

 side. Anterior antennæ scarcely as long as the anterior division of 

 the body. Last pair of legs rather robust and somewhat asym- 

 metrical, terminal joint very strong, claw-like, and coarsely denti- 

 culated in its outer part, that of right leg somewhat larger than 

 that of left. Spermatophore narrow bottle-shaped, accompanying 

 plate forming on each side a wing-like expansion folded upwards. 



Male very unlike the female, with the last segment of meta- 

 some quite simple. Urosome much more slender, and narrow cylin- 

 drical in form; caudal rami comparatively small and quite symmetrical, 

 marginal setæ normally developed. Right anterior antennæ exceed- 

 ingly powerful, with the proximal part of the middle section much 

 tumefied, Ist joint of terminal section armed with a long, claw-like 

 spine curving anteriorly. Last pair of legs largely developed and 

 very asymmetrical, right leg more than twice as long as the left, 

 and exhibiting inside the Ist and 3rd joints a narrow lamellar pro- 

 jection, that of Ist joint lanceolate, that of 3rd rounded at the tip, 

 terminal joint very slender, with a knob-like projection outside near 

 the base and a slender seta in the middle of the inner edge, tip 

 armed with a short curved spine. Left leg without any inner pro- 

 jections, penultimate joint forming outside a rounded lobe, to which 

 is appended a very delicate rugulose plate, terminal joint small, 

 digitiform. Length of body in both sexes about 1 mm. 



Bemarks. — The present species is easily distinguishable from that 

 occurring in the Black Sea and the Mediterranean (P. latisetosa), 

 both by the large size of the lateral expansions of the last segment 

 of the metasome in the female, and by the very different form of 

 its genital segment. It is much more nearly related to the New 

 Guinea species described by Th. Scott, and indeed at first I 

 was much inclined to regard the two as identical. On a closer 

 comparison with the figures given by Th. Scott, however, I 

 find several differences, which seem to forbid such an identifi- 

 cation. Thus in the New Guinea species the general form of the 

 body in the female is considerably more robust, with the anterior 

 division somewhat tumid and the urosome comparatively longer. 

 Moreover, the genital segment is of rather different form, and the 



