Chilton. — Ceina, an Aberrant Genus of the TfiUtridae. 



129 



but distally it narrows a little more than in the third ; in the fiftli (fig. 22) 

 the expansion is considerably broader than in the fourth, and the posterior 

 margin is regularly and strongly convex. In all the peraeopoda the propod 

 is considerably longer than the carpus, and bears a few small setae on the 

 inner margin at the base of the finger. The finger is stout, strongly curved, 

 and the spinule on its inner margin is of moderate thickness. 



The segments of the pleon (fig. 23) have the downward expansions rather 

 narrow, the anterior angle mucli rounded off, the posterior nearly rect- 

 angular but rounded ; the posterior margin with a few shallow crenations 

 and a very minute setule in each depression. 



The uropoda are all short and somewhat stout (fig. 24). In the first 

 the peduncle is longer than the rami and bears a spinule on its u])per margin 

 at the end ; the rami are subequal, and both bear lateral as well as apical 

 setules. The second uropod is similar in shape but has the peduncle only 

 as long as the rami ; these reach as far back as those of the first uropod. 



Fig. 23. — Ceina egregia ; pleon segment 3, lower portion. 

 Fig. 24. — Ceina egregia ; urns and uropoda, side view. 

 Fig. 25. — -Ceina egregia ; telso2i from above, with terminal segment and 

 third uropoda. 



The third uro})od (figs. 24 and 25) is represented only by a small semi- 

 circular lobe with entire margins attached to the sixth segment of the 

 pleon and representing either the peduncle or the peduncle and rami fused. 



The telson (fig. 25) is convex dorsally, and when viewed from above 

 shows as a semicircular plate with entire margins without setae and cleft 

 for about one-third of its length. Viewed laterally the plate appears to be 

 fairly thick and strongly curved so as to be concave below. 



The figures, which add so much to the value of this paper, have 

 been prepared by Miss E. M. Herriott, M.A., Assistant in the Biological 

 Laboratory of Canterbury College. They all refer to Ceina egregia, and 

 unless otherwise stated are drawn from a male specimen. 



Eeferences. 



Chilton, C, 1883. Further Additions to our Knowledge of the New Zealand Crustacea, 



Trans. N.Z. Inst., vol. 15, pp. 09-86, pi. 1-3. 

 Della Valle, a., 1893. Gammarini del Golfo Napoli, Fauna und Flora des Golfes von 



Neajnl, Monographie 20. 

 Saes, G. 0., 1895. An Account of the Crustacea of Norivay : I, Amphipoda. 

 Stebbing, T. R. R., 1888. Report on the " Challenger " AmjMpoda. 

 1899. Amphipoda from the Copenhagen Museum and other Sources, Part 2, 



Trans. Linn. Sac. Zool, vol. 7, pp. 395-432, pi. 30-35. 

 — — ■ 1906. Amphipoda ; I, Gammaridea, Das Tierreich, Lieferung 21. 



5 — Trans. 



