HYPERIA GALBA, 13 
Guerin, Icon. R. An. Crust. pl. xxv. fig. 5. 
Wuirr, Cat. Crust. Brit. Mus. 1847 and 1850. 
Hist. Brit. Crust. p. 206, pl. xi. fig. 3. Gossz, 
Mar. Zool. p. 139, fig. 251. 
Metoechus medusarum, Wauttn, Hist. Brit. Crust. p. 207. 
Hiella Orbignit. Srravuss, Mém. du Muséum, vol. xviii. pl. 4. 
TuE head is large and rounded. The body is very con- 
siderably dilated, while the tail is much narrowed. The 
eyes are large and occupy nearly the whole surface of 
the head, distinguished by an exquisite soft tint of 
green when the animal is alive. The superior antennz 
consist of a short peduncle (the last two joints of which 
are shorter than the first) and a flagellum, which is not 
quite so long as the depth of the head; this flagellum 
consists of a long articulus and a few faintly-marked 
terminal articuli, but these appear to be either not con- 
stant or only visible under treatment with liquor po- 
tassee. The inferior antenne are scarcely as long as the 
superior, and terminate in a flagellum nearly resembling 
that just described. The terminal articuli are, therefore, 
not to be depended upon as a specific character. The 
arms are small, and differ but slightly; the second pair 
have the hand somewhat the longer, and the wrist some- 
what more infero-anteriorly developed than in the first 
pair; both have the margin of the wrist fringed with 
strong but not very sharp spines. ‘The walking legs are 
nearly of one length, and tolerably robust. The caudal 
appendages are broad and flat, and have the rami serrated 
at the margins. The peduncle of the last pair reaches 
quite to the extremity of the preceding, and the middle 
piece consists of a small lanceolate scale. 
The colour of the species, except the green eyes, is 
fawn, or faint yellow, passing into a salmon tint soon 
after the animal is put into spirits; it is also dotted all 
over with small specks of red. 
