BOPYRID®. 223 
ISOPODA. BOPYRIDA. 
NORMALIA. 
Genus—GYGE, CorNnaLIA AND PANCERI. 
Mem. Acad. Reale di Torino, Ser, 2, t. 19 (1861), p. 85. 
Male. Cephalon as broad as first segment of the pereion. 
Pereion long and narrow, segments subequal in length. Pleon 
short and broad, segments distinct and subequal in length with 
those of the pereion. Eyes small and situated at the posterior 
part of the cephalon; second pair of antennze well developed. 
Female. Oval, anteriorly slightly unsymmetrical. Pereion, 
having the segments subequal, except the first two. Pleon having 
the segments distinct and subequal with those of the pereion. 
Antenne rudimentary. Branchial appendages consisting of a 
series of small single sacs attached within the ventral lateral 
extremity of the several segments of the pleon, and a series of 
transverse folds between them. Posterior pair of pleopoda 
slightly developed. 
Tuis genus is certainly near Bopyrus, but differs from 
it in important structural conditions. It must also be 
very closely allied to the genus Bopyroides of Stimpson, 
which that author has formed for those species that 
agree in shape and structure with Bopyrus, but differ in 
their branchial features, in having “ merely fleshy ridges 
instead of lamina.” 
From the female Bopyrus and therefore also from Bopy- 
roides this genus differs in shape, being roundly oval, and 
not having the pleon narrower than the pereion; moreover, 
in this genus the.segments are distinct, in which it coin- 
cides with Stimpson’s description of Bopyroides, whereas 
in Bopyrus they are all fused together in the central 
dorsal axis. Bopyrus, also, is unsymmetrical throughout, 
