640 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



Schibdte and Meinert, from whom I have borrowed the reference to Bleaker, 

 place side by side leptosoma and dimicUata as two species of Anilocra- having in 

 common geniculate first antennae, side-plates not carinate and the fingers of the first 

 four pairs of legs inflated in the middle. The ovigerous female of A. leptosoma is 

 described as attaining a length of 33".5 mm., with a body long elliptic, three or four 

 times longer than broad (almost as 10 : 3). The o\dgerous female of A. dimidiata 

 has assigned to it a length of 265 mm., with a body elliptic, scarcely three times 

 as long as broad (20 : 7). But Miers gives the length of this species as an inch 

 and a third, therefore practically as long as A. leptosoma. A specimen in Dr Willey's 

 collection is 35 mm. long by 10 mm. broad. Consequently the shape is not a dis- 

 tinguishing character between the two species. The points on which I rely for 

 identifying Dr Willey's specimen with A. dimidiata, as described by Schiodte and 

 Meinert, are the following. It has the ' front margin of the first peraeon segment 

 manifestly trisinuate, with the lateral sinuses much deeper than the middle sinus,' 

 the sides of the fifth pleon segment 'deeply, angularly incised.' and the terminal, 

 obscurely carinate, segment not produced into an apical point. To these features 

 may perhaps be added the character that the uropods extend very slightly beyond 

 the telson. According to Schiodte and Meinert they do not quite reach the end 

 of the telson in A. dimidiata, while in A. leptosoma the inner ramus reaches far 

 beyond it. Koelbel in his Anilocra alloceraea speaks of the two rami as nearly 

 equal and both reaching somewhat beyond the telson. His species is confidently 

 identified with A. leptosoma by Schiodte and Meinert, and doubtfully by Miers. 

 The latter author {he. cit. p. 463) says, ' Bleeker, it may be observed, notes that 

 the uropoda in A. leptosoma do not reach beyond the extremity of the terminal 

 post-abdomiual segment ; in his figure, however, they are represented as distinctly 

 longer than this segment, in this particular agreeing both with Kolbel's de.scription of 

 A. alloceraea and with the specimen before me.' It may be remarked that the 

 extension of the uropods in relation to the telson is not always easy to determine, 

 as the appearance varies, according as the rami are directed inward or outward, and 

 according to the amount of flattening to which the specimen is exposed. 



In the specimen 35 mm. long the young could be perceived through the partial!}' 

 pellucid plates of the marsupium. These showed the head between the dark eyes 

 thickly covered with dark stellate markings. A second specimen measures 22 mm. by 

 6'25 mm., and a third 15 mm. by about 4"5 mm. 



Habitat. One label in the bottle with these specimens read, ' Cymothoa off fish 

 called Losilili. Karuana, Nov. 1895,' the other, ' D'Entrecasteaux group. British New 

 Guinea.' 



Gen. Renocila, Miers. 



1880. Renocila, Miers, Ann. Nat. Hist., Ser. 5, vol. 5, p. 464. 



1884. Renocila, Schiodte and Meinert, Mon. Cymothoarum, Nat. Tidsskr., Ser. 3, 

 vol. 14, p. 414. 



According to Miers, 'this genus, in all its characters, is most nearly allied to 

 Anilocra, from which it is distinguished by its broad non-inflexed front, the greatly 

 l^roduced postero-lateral angles of the three posterior thoracic segments, and the greatly 



