40 ME. E. J. MIERS ON THE IDOTEID^. 



Numerous specimeus were found iuthe Tomahawk lagoou, near 

 Dunedin (Prof. Hutton). They were creeping about under 

 stones, and appeared to be feeding on the ova of a fish, probably 

 Galaxis, whicb was found abundantly in tbe same locality. It is 

 chiefly remarkable, as Mr. Thomson points out, for its occurrence 

 in fresh water, though whether it lives there permanently or only 

 comes up when a very high tide renders communication with the 

 lagoon possible, is uncertain. 



The freshwater habitat is not peculiar to this species, since 

 Prof. Loven has detected Glyptonotus entomon in the Swedisli 

 lakes (CEfvers. Vetensk.- Akad. Forhandl. Stockholm, xviii. p. 286, 

 1862.) 



In numerous females the incubatory pouch extended aloug the 

 whole undersurface of the thorax. The young animals, taken out 

 of this sac, have their bodies somewhat elongated in shape, with 

 all the segmeuts developed and appendages present, but having 

 the outer antennae furnished with a flagellum of only one joint, 

 and a few short set^. 



The figure is from specimens in the British-Museum collection 

 from Port Henry, Straits of Magellan (Dr. E. P. Coppingei-)*, 

 that agree fairly well with the above description, but which 

 I refer with much hesitation to I. lacustris, on account of the 

 Avidely-remote locality at which they were obtained and their 

 (probable) marine habitat. I at first (Proc. Zool. Soc. 1881, 

 p. 76) referred them with doubt to I. anmdata, Dana, a species 

 that in this revision is regarded as synonymous with 1. metallica. 

 The colour in these specimens is of a uniform chestnut-brown, 

 the front margin of the head very slightly excavated, and the 

 flagella of the antennae 7-jointed. If distinct, they may be 

 designated I. rotundicauda. 



Idotea "Wosnesenskii. 



Idotea Wosnesenskii, Brandt, in Middendorff's Sibirische Reise, Zool. 



ii. Cr. p. 146 (1851); Stimpson, Bost. Journ. Nat. Hist. vi. p. 504 



(1857) ; S. Bate, in Lord's Nat. in Brit. Columbia, ii. p. 281 (1866). 

 Idotea hirtipes, Dana, Cr. U.S. Exjil. Exp. xiv. (2) p. 704, pi. xlvi. 



fig. 6 (1853), nee M.-JEJdwards. 

 Idotea oregonensis, Dana, Pr. Acad. Nat. Sci. Phil. vii. p. 175 (1854). 

 Idotea media (Dana"?), S. Bate, in Lord's Nat. in Brit. Columbia, ii. 



p. 282 (1866). 



Is characterized by its oblong-oval, convex body, which is 

 relatively shorter and broader than in Z ocTiofensis, and is without 



