1 9{ ) Trail sact to us. — Zoology. 



these fringes seem to be of the same character as those found 

 on the propodos of the second gnathopod of the males of the 

 Amphipods Kicea fimbriata, G. M. Thomson/'' and Elasinajyua 

 siihcarinata (= Mcera siihcari iiata , G. M. Thomson).! 



In this species the males and females closely resemble one 

 another in general shape of the body, and do not present the 

 differences found in I. ehngata and, to a much less extent, in 

 /. pcronii. 



As I have already pointed out, this species is not so 

 specialised as I. eloiigata, &c. In the opercular plates the 

 second ramus is represented by a small membranous plate 

 fringed with long j)lumose sette, and the terminal plate also 

 bears a few short setae at the distal end. 



In the brood-pouches of the females many young were 

 found. All of these that I have examined resemble the adult 

 animals, except that the seventh thoracic segment was small 

 and without appendages. 



Idotea ungulata. 



Idotea ungulata, Miers, "Jour. Linn. Soc. Zoologv," xvi., 

 p. 52 (1881); Thomson, "N.Z. Jour, of Science,"" vol. i.. 

 p. 332 (1883); Thomson and Chilton, "Trans. N.Z. Inst.,'* 

 xviii., p. 156 (1886). 



Idotea affinis, Miers, "Cat. N.Z. Crust.," p. 93 (1876); 

 Thomson, "Trans. N.Z. Inst.," xi., p. 232 (1879). 



Idotea excavata, Haswell, " Proc. Linn. Soc. N.S.W.," 

 vol. vi., p. 2 ; " Cat. Australian Crust.," p. 277 (1882). 



"Body oblong, moderately convex, and nearly smooth. 

 Head with the frontal margin very slightly concave, but with 

 a slight depression in the middle ; antero-lateral angles usually 

 but little prominent, smooth above, or with faint indications of 

 an impressed curved line near the posterior margin. Segments 

 of the thorax smooth ; the first the shortest, its antero-lateral 

 processes obtuse ; the postero-lateral angles of the first to third 

 segments rounded, of the fourth to seventh segments rectangular 

 or acute. Postabdomen somewhat depressed towards its distal 

 extremity, smooth, with lateral sutures indicative of two co- 

 alescent segments ; terminal segment with the lateral margins 

 straight to within a short distance of the postero-lateral angles, 

 which are either obtuse or acute ; distal end emarginate. 

 Eyes small, black. Antennules not reaching to the distal end 

 of the penultimate joint of the peduncle of the antennae. 

 Antennae when retracted not reaching to the posterior margin 

 of the fourtli thoracic segment, and often much shorter; last 

 two joints of the peduncle short and subequal ; flagellum 



* See " Trans. N.Z. Inst.," xi., p. 236. 



t See " Annals and Mag. Nat. Hist," ser, -5, vol, xvi., p. 308. 



