ON CRUSTACEA BROUGHT BY DR WJLLEY FROM THK SOUTH SEAS. 623 



1886. Paranthu7-a, Norman and Stebbing, Trans. Zool. Soc. London, vol. 12, pt. 4, 

 p. 122. 



1893. Paranthura, Stebbing, History of Crustacea, Internat. Sci. Ser., vol. 74, p. 332. 



Several species have been referred to this genus by Haswell and Beddard, but, as 

 no description is given of the mouth-organs, their generic position remains at present 

 doubtful. 



To the account of the genus given in 188G the following observations maj' be 

 added. The upper lip, as in Cnlatlmra, is elongate triangular, the pellucid apical part 

 nearly parallel-sided with rounded tip. The third joint of the mandibular palp is armed 

 , with a series of spines. The spear-like first maxillae, with reverted teeth on the distal 

 part, appear generally to protrude in advance of the mandibular apices, as though fitted to 

 take the lead in piercing a victim. The second maxillae are very delicate organs facing 

 the lower lip, so as to form a channel, which is greatly strengthened by the mandibles 

 and the maxillipeds. The only parts which appear to have much freedom of movement 

 are the first maxillae. When the maxillipeds have been removed, the first maxillae can 

 be drawn out from between the .second maxillae and the lower lip without disturbing the 

 other organs. The maxillipeds have a small oval epipod, a long basal (or second) joint, 

 proximally emarginate at the side for the convenience of the epipod, not, or scarcely at 

 all, distally produced at the inner margin, being in this respect distinguished from 

 Calatlmra, as also in the palp, which is tapering, two-jointed, with the division between 

 the <two joints almost imperceptible, whereas in Calathvra the palp has three joints, the 

 fii'st very small, the third somewhat lamellar, as shown in Sars' figure of Calathura nur- 

 vegica. My figure of Calathura bracliiata in 1880 does not give the articulation of the 

 terminal joint, and shows it edgewise, in its natural position relatively to the rest of the 

 appendage, but in a misleading one for diagnosis. In Paranthura the maxillipeds clo-sely 

 resemble those of Leptanthura, but in the new species about to be described the basal 

 joint is not twice as long as the palp. Also in the new species the distinctness of the 

 pleon segments medio-dorsally is obscure, though laterally it is clear. 



Paranthura lifuensis, n. sp. 

 Plate LXVI b. 



Head a little longer than broad, median rostral point very small, not reaching 

 so far as the lateral angles. Segments of peraeon not elongate, seventh more than 

 half as long as sixth, as long as the six following segments of the pleon combined. 

 Of the latter the first and sixth are distinct, but the intermediate four are ditticult 

 to distinguish except laterally. Body a little pubescent. 



Eyes small, dark in spirit, near to the front angles of the head, the component 

 ocelli about fifteen in number. 



Upper antennae little shorter than lower, third joint longer than second, shorter 

 than the four-jointed flagellum, in which the third joint is the longest. 



