ISOPODA. 27 



given by the Danish authors as well as could be expected considering its smaller size. 

 The slender second antennae, however, consist of thirteen joints instead of twelve. 

 The eight-jointed first antennas have the five joints of the flagellum each apically 

 furnished with a spray of sensory filaments. The male appendix of the second 

 pleopods, which the above-named authorities describe as very thin, hooked, scarcely 

 reaching the end of the rami, is, in our example, only a third as long as the rami, not 

 especially thin, and not showing any perceptible hook. The coupling spines of the 

 peduncle are numerous. The delicately laminar rami of the uropods have fringes of 

 finely plumose setae and are scarcely, or not at all, shorter than the telsonic segment, 

 the broadly rounded hind margin of which is fringed with very short but finely 

 plumose setae. Its base carries dorsally numerous setules, of which there are a few 

 on the preceding segments. The pleopods are without setae, according to the custom 

 of the family Cymothoidae. 



A feature of our specimen, to which Schiodte and Meinert make no allusion, is, 

 that in all the limbs the fifth joint has the inner apex protruding, acutely in the first 

 gnathopod, broadly in the fifth peraeopod, where it is armed with three spines. The 

 third joint is remarkably short in the former, but tolerably long in the latter pair of 

 limbs. In all the limbs the finger is strongly uncinate. 



Colour orange yellow, lightly sprinkled with small dark flecks, especially on the 

 sides, the limbs pale. 



Length about 6 '7 5 millims., breadth about 2 '75 millims. 



Locality : Station LVIIL, off Karativo Paar, 9 to 26 fathoms. 



Irona, Schiodte and Meinert. 



1884, Irona, Schiodte and Meinert, 'Nat. Tidsskr.,' ser. 3, vol. 14, pp. 327, 381. 

 1897, Irona, H. J. Hansen, 'Bull. Mus Comp. Zool. Harvard,' vol. 31, p. 110. 

 1901, Irona, H. Richardson, 'Proc. U.S. Mus.,' vol. 23, pp. 525, 531. 



This genus was placed by its authors in the Livonecinae, the third tribe of their 

 family Cymothoidae. From the seven other genera which they assign to the same 

 tribe it is distinguished by one or more of the following characters : Segments of 

 the pleon clearly separate, fifth pereeopods subecmal in length to the preceding legs, 

 or a little longer, with uncinate fingers, the body all moderately convex, the front 

 broadly or shortly rounded, the pleon deeply immersed in the peraeon. 



In the definition of the genus nothing is said as to the mouth organs or the 

 character of the pleopods. Four species were placed in the genus, to which Hansen 

 has since added a fifth, 7. foveolata. This last agrees with the species about to be 

 described in a rather striking feature, of which Hansen gives the following account : 

 The side-plates of the sixth, and especially of the seventh, segment are much broader 

 and posteriorly much more produced than the others, besides on each side rising 

 considerably above the more lateral part of the dorsal surface of the thorax [peraeon], 

 which is brought about by the curious fact that these epimera are turned outwards 



e 2 



