ISOPODS COLLECTED AT THE HAWAIIAN ISLANDS BY THE 
U. S. FISH COMMISSION STEAMER ALBATROSS. 
By HARRIET RICHARDSON, Ph. D. 
The United States Fish Commission is undertaking a systematic exploration of 
the marine fauna of the Hawaiian Islands, under the direction of Dr. D. S. Jordan. 
During the summer of 1902, under the immediate charge of Prof. C. H. Gilbert, 
the Albatross was engaged in dredging in the vicinity, while a party of assistants 
explored the shore and shallow water. 
The isopods collected were not numerous. Most of them are new to science, 
only two species in the collection, Ligia hawaiensis Dana and Gymothoa recta Dana, 
having been previously recorded from the islands. 
Two new genera of parasitic isopods, representing different families of Epicaridea, 
the Dajidse and the Bopyridse , are herein described. The Bopyrid genus is particu- 
larly interesting, because it is the first of that family known to occur in the visceral 
cavity of Decapods, the Entoniscidae, alone being known to have that position in 
relation to their hosts, the Brachyurous Crustacea. 
CHELIFERA or TANAIOIDEA. 
Family APSEUDM. 
Apseudes sp. ? 
One mutilated specimen was obtained by the United States Fish Commission steamer Albatross off 
the south coast of Molokai Island, the Hawaiian Islands. 
FLABELUFERA or CYM0TH0IDEA. 
Family JiGIDJi. 
JEg-a quadratasinus Richardson sp. nov. Fig. 1. 
Body (fig. 1 a) ovate, about 2J times longer than broad. Color uniformly light yellow. 
Head with frontal margin rounded and produced in a small median process between the basal 
joints of the first pair of antennae; posterior margin nearly straight. Eyes situated on the antero- 
lateral margin, extending along each side from the posterior margin of the head to the proximal end 
of the third peduncular joint of the first pair of antennae and separated from each other on the 
anterior margin by a distance equal to the length of one eye. The first pair of antennae (fig. 1 b) have 
the peduncle composed of 2 short joints of equal length and a long, slender joint equal to the length of 
the first two taken together; none of these joints are dilated; the flagellum is composed of 24 joints and 
extends to the posterior margin of the second thoracic segment. The second pair of antennae have a 
5-jointed peduncle, the distal end of the fifth joint of which extends to the middle of the first thoracic 
segment; the flagellum is composed of 24 joints and reaches the posterior margin of the third thoracic 
segme nt. The frontal lamina or interant ennal plate is cpne-shaped._round and flat at its jiistal ejudi 
and produced at its proximal end to an acute point, 
