REPORT ON THE AMPHIPODA. 1255 



1879. Caprclla sequilibra, Haller, Lannodipodes filiformes, Zeitsehr. f. Wiss. Zool., Bd. xxxiii. 



p. 404. 



1879. ,, caudata, G. M. Thomson, Trans. New Zealand Inst., vol. xi. p. 24G, pi. x.d, fig. 5. 



1880. „ obem, Haswell, Troc. Linn. Soc. N.S.W., vol. iv. p. 348, pi. xxiv. fig. 1. 

 1882. „ „ Haswell, Catal. Australian Crust., p. 314. 



1882. „ eequilibra, Mayer, Die Caprelliden, p. 45, taf. i. fig. 7, taf. ii. figs. 1-11, taf. iv. 



figs. 20-25, taf. v. figs. 16-18. 



1884. „ „ Miers, Report on Zool. Coll. H.M.S. "Alert," pp. 180, 320. 



1885. „ „ Haswell, Proc. Linn. Soc. N.S.W., vol. ix. pt. iv. (extract p. 7). 



1886. „ „ Thomson and Chilton, Trans. New Zealand Inst., vol. xviii. p. 142. 



A few notes are added in regard to this widely distributed and often described 

 species for the identification of the Challenger specimens. 



Upper Antennas with the peduncle stout, the third joint longer than the first, each 

 of these shorter than the second ; the flagellum abruptly narrower than the peduncle, of 

 twelve joints, almost all of which are distally expanded, and all of them together not 

 nearly as long as the third joint of the peduncle. In the female specimen examined the 

 flagellum was less conspicuously narrower than the third joint of the peduncle and 

 exceeded that joint in length. 



Lower Antenna?. — The flagellum nearly as long as the fourth or the fifth joint of the 

 peduncle, strongly fringed like them, with short curved spines on the distal part of the 

 long first joint, which is six or seven times as long as the second, this terminal joint 

 being very narrow as well as short. In the female the flagellum is quite as long as the 

 fifth joint of the peduncle. 



Upper Lip bilobed. 



Mandibles. — Cutting edge divided into five strong but very unequal teeth ; secondary 

 plate of the left mandible strong, divided like the principal plate ; secondary plate of the 

 right mandible slighter, with a prominent slender distal tooth, and the upper edge only 

 slightly divided into two or three inconspicuous denticles ; spine-row on the left mandible 

 of three, on the right of two, stout curved feathered spines ; molar tubercle strong, with 

 a powerful tooth on the front border, giving the crown a very irregular outline. 



Lower Lip. — Principal lobes strongly dehiscent, only a little advanced in front of the 

 inner lobes which are fully as large as the outer, and fill up almost all the gap between 

 them, but the inner lobes about halfway from the base become coalescent with one 

 another, and their outer margins not very far from the rounded apical borders seem to 

 lose themselves on the sides of the principal lobes ; the mandibular processes not 

 divergent, apically narrow. 



First Maxillze. — Inner plate undeveloped ; the outer plate smaller than the palp, with 

 the dentate distal margin carrying seven spines, all of them having one or more strong- 

 lateral denticles ; the first joint of the palp short, the second widening towards the 

 dentate obliquely convex distal margin, which is fringed with thirteen slender spines, 

 none very long, the outermost the longest, the innermost six slenderer than the rest ; on 



