ON CRUSTACEA BROUGHT liV DK WIM.in I'ROM THE SOUTH SEAS. 637 



preceding pleopods. The peduncles of the fifth pair are less prominent than those 

 of the fourth and are perhaps unarmed. The plates of the first and second pleopods 

 are uanowcr than those of the following pairs, and both inner and outer plates have 

 some plumose setae. In all the inner plate is smaller than the outer; in the last 

 three pairs it is without setae, and in these pairs the outer plate has a transverse 

 suture. 



Uropods. The peduncle has its inner margin acutely produced to about the 

 middle of the ver}' broad inner ramus, which does not reach the end of the pleon. 

 The outer ramus is rather more tlian twice as long as broad, oblong, with rounded 

 apex, shorter than the inner ramus, which widens distally till it is twice as wide 

 as the outer. Both curve a little inward. 



Length, 10 ram., breadth, 5 mm. 



Habitat. Isle of Pines, south of New Caledonia. 



The specific name, from the Greek liviTOTrov^, uneijual-footed, refers to the charac- 

 teristic size of the first legs, which in this family is rather remarkable. The spelling 

 anisopous is preferred to anisop2is, to precludi' if possible the atrocity of anisopa,, as 

 a supposed correction to agree with the generic termination. 



Fam. Ai.cirdxidae. 



1890. Aldronidae, H. J. Hansen, Vid. Selsk. Skr., Ser. C, vol. 3, pp. 285, 312, 390. 



1893. Aldronidae, Stubbing, History of Crustacea, Internal. Sci. Ser., vol. 7-1, 

 pp. 341, 34f!. 



To this family Hansen assigns his own two genera Alcironu and Lanocira, Tacliaea 

 of SchiiJdte and Meinert, and possibly Kossmann's Gonlana. The limbs of the peraeon 

 are withotit long natatory setae. 



Gen. Ai.cikona, Hansen. 



1890. Alcironu, Hansen, loc. cit., pp. 313, 391. 

 1893. Alcirana, Stebbing, loc. cit., p. 346. 



The cl^^eus is broadly crescent-shaped. The genus contains apparently four species, 

 krehsii and insularis of Hansen, together with that named .Ega multidigitu by Dana, 

 and that named Cirolana multidiqitdtc by Miers. 



Ai.ciKo.NA iNSLLAius, Hansen. 



1890. Alcironu insularis, Hansen, Cirolanidae, pp. .51, 1.5.'), l.")7, pi. <S, fig. 2 — in, in 

 K. D. Vid. Sel.sk. Skr., Ser. (J, vol. 3, pp. 287, 291, 393. 



Ill his very much larger species, Alcirona krehsii, out of seven examples Hansen 

 describes and figuri's a male, i)robably aijidt, 92 nnn. long, and a great non-ovigorous 

 female 18 mm. long. These are contrasted iu shape by the circumstance that tlio 



84—2 



