682 THE VOYAGE OF H.M.S. CHALLENGER. 



" Appendix caudalis parva, Integra, postice rotundata." 



In this definition, in the account of the mandibuhir palp, I propose to insert the 

 words vel profundius before affixo, in the description of the telson to place instead of 

 postice rotundata the words vel parum incisa, and in that of the maxillipeds to omit the 

 measurement of the outer plates. 



Lysianax variegatus (Stimpson) (PL XXIII.). 



1855. Anonyx variegatus, Stimpson, Proc. Acad. Nat. Sci. Pliiladelpliia, p. 394, 



1862. Lijsianassa variegata, Sp. Bate, Brit. Mus. Catal. Amphip. Crust., p. 67, pi. x. fig. 7. 



Head short, rostrum minute, lateral lobes produced into a rounded angle ; back 

 rounded, slightly hairy ; third segment of the pleou with lower margin upturned, so that 

 the postero-lateral tooth, which is not a very sharp one, comes high up on the hind 

 margin ; the fourth segment but little dorsally depressed, the sixth produced far along 

 the sides of the telson. 



Eyes large, reniform, bending round from the top of the head to the lateral lobes, 

 very dark-coloured in the spirit-specimens, the ocelli numbering perhaps a hundred and 

 fifty. 



Upper Antennse. — The first joint tumid, not very long, carrying some groups of setae 

 as well as a row of feathered cilia; the second joint, though much shorter and narrower 

 than the first, is much longer than the third ; the flagellum of eight joints, of which the 

 first is rather shorter than the second of the peduncle, the cylinders of the brush forming 

 some fifteen rows in this narrow space; the remaining joints, becoming successively shorter 

 and much narrower, likewise have cylinders; the secondary flagellum is of four joints, the 

 last minute, the first nearly as long as the first of the primary. 



Lower Antenii^. — The gland-cone not very prominent, the third joint short, the 

 proportions of the fourth and fifth not constant ; in a specimen with an eight-jointed 

 flagellum the fifth joint of the peduncle, as shown in fig. B, did not very greatly exceed 

 the length of the fourth joint, whereas in the specimen represented in fig. C the fifth 

 joint is double the length of the fourth, and the fourth is much inflated; both joints have 

 groups of cilia on the upper edge, the fifth joint has its lower margin smoothly convex, 

 and instead of being widened distally as in the smaller form, is distally narrowed ; this 

 is evidently the form belonging to the adult male ; there are calceoli with their attendant 

 cilia on many of the fifty-three joints of the slender flagellum ; the calceolus is of narrow 

 oval form with continuous rim. With the form of the male antennae above described 

 may be compared the figures in the British Sessile-eyed Crustacea of the lower antennas 

 of the species there called Lysianossa longicm'nis and Anonyx longicornis ; a similar 

 form of the lower antennse in the male is to be met with in genera outside of the 

 Lysianassidse. 



Epistome presents a rounded lobe ascending almost to meet the triangular lateral 



