Chilton. — On New Zealand Icloteiclije. 19?> 



not reaching to the anterior end of the epimeron of succeeding 

 segment. Opercular plates subtriangular, with slightly-raised 

 border on inner margin ; terminal plates very small, triangular, 

 ending acutely. Legs short, not visible in dorsal view. Colour 

 gre\ish. Length, 10mm.; breadth, (about) -imm. 



Hah. Sumner, Canterbury, New Zealand. 



A single specimen taken on the under-surface of a boulder 

 exposed at low tide. 



This species appears very distinct, and by the ridges and 

 markings on the body is easily distinguished from other New 

 Zealand species. I have never seen more than the original 

 specimen, and have therefore nothing to add to my original 

 description. 



Idotea metallica. 



Idutea metallica, Bosc, " Hist. Nat. Crust.," ii., p. 179, 

 pi. XV., fig. 6 (1802). 



Idotea argentea, Miers, "Cat. N.Z. Crust.," p. 92 (1876). 



Idotea metallica, Miers, " Jour. Linn. Soc. Zoology," 

 xvi., p. 35 (1881); Thomson and Chilton, "Trans. N'.Z. 

 Inst.," xviii., p. 155 (1886). 



" This species is oblong-oval, moderately convex, the some- 

 what projecting epimera usually giving, in the adult, a serrated 

 appearance to the sides of the thorax. The head is transverse, 

 with the anterior margin slightly concave ; the antero-lateral 

 angles rounded, and but little prominent ; near the posterior 

 margin of the head is a deeply impressed arcuated transverse 

 furrow. The surface of the body is more or less rugose ; the 

 lateral sutures on the dorsal surface of the postabdomen 

 posterior to the second segment are strongly marked, nearly 

 straight, and directed obliquely upward towards the middle line 

 of the bod}' ; the terminal segment is convex, nearly oblong, 

 rounded at the poscero-lateral angles ; posterior margin square- 

 truncated or very slightly excavated, or with a very obscure 

 median denticle. The eyes are large and prominent. The 

 terminal joint of the peduncle of the antennaj longer than the 

 preceding ; the flagellum short, usually 7-10-jointed. The 

 epimera are well developed, with the postero-lateral angles 

 subacute and usually somewhat projecting in the adult ; the 

 l)asal plate of the opercular valves is oblong, with parallel 

 sides ; the terminal plate nearly square, but rounded off at its 

 externo-distal angle." — [Mieks.] 



Length, from 17mm. to 28mm. (Miers). 



Of this species Miers says, " iVpparently a very common 

 and almost cosmopolitan species, probably occurring every- 

 where except in arctic and antarctic latitudes." 



It was introduced originally into the New Zealand catalogue 

 on the authority of Dana, who referred a specimen six lines 

 13 



