ISOPODS COLLECTED AT THE HAWAIIAN ISLANDS. 
821 
JEga, deshayesiana Milne Edwards. 
Rocinela deshayesiana Milne Edwards, Hist. Nat. Crust., in, p. 243. 
jEga deshayesiana Schioedte & Meinert, Naturhistorisk Tidsskrift, xii (3), 1879-1880, pp. 300-361, pi. vm, figs. 7-9. 
Locality . — Pailolo Channel, between Molokai and Maui Islands and Northeast Approach. 
This species is recorded from the Mediterranean (Milne Edwards); from the Adriatic, at Fayal, 
the Azores, and Panorma (Schioedte & Meinert); from lat. 15° 4CK N., long. 23° 5 / 8" W. (Studer). 
A single specimen was obtained by the Albatross which differs from those recorded as described 
and figured by Schicedte & Meinert only in having 7 spines instead of 6 on the merus, and in not hav- 
ing the single spine on the distal end of the propodus. Its occurrence in this locality is rather 
remarkable. 
Rocinela hawaiiensis Richardson, sp. nov. Fig. 2. 
Body (fig. 2 a) narrow, elongate, 2£ times longer than wide. Color uniformly yellow, with no 
markings. 
Head triangular; front produced over the basal joints of the first pair of antennae. Eyes very large 
and round, separated from each other by a distance equal only to half the width of one eye. First 
pair of antennae, with a flagellum of 5 joints, extend to the end of the peduncle of the second pair of 
antennae. Second pair of antennae, with a flagellum of 17 
joints, reach the posterior margin of the second thoracic 
segment. 
First two segments of thorax subequal in length; third 
and fourth subequal and a little longer than the first two; 
fifth and sixth longest, each one nearly equal to the first 
two segments taken together; seventh segment shorter than 
the two preceding, about equal to the third or fourth. 
Epimera of the last four segments acutely pointed at their 
posterior extremities; those of the.second and third seg- 
ments more rounded posteriorly. 
The first abdominal seg- 
ment is entirely concealed by 
the seventh thoracic segment 
except at the sides; the three 
following segments are sub- 
equal, with acutely produced 
. postero-lateral angles; the 
fourth segment has the sides 
not produced and mostly cov- 
ered by the postero-lateral 
angles of the preceding seg 
ment; terminal segment nar- 
rowly rounded. Uropoda oar- 
like, subequal in length and 
equal in width . Both branches 
are faintly crenulate on the ex- 
ternal margin. The basal joint 
of the uropoda extends on] y half 
the length of the inner branch. 
First 3 pairs of legs (fig. 2 b) prehensile, with long, slender, curved dactyli; propodus armed with 
3 spines; the carpus with 1 spine, and the merus with 3 spines, except on the first pair of legs. The 4 
gressorial legs are long and slender and armed with few spines. 
Only one specimen was taken by the U. S. Fish Commission steamer Albatross at Kauai Island, 
the Hawaiian Islands, at a depth of 636 to 414 fathoms. 
Type in U. S. National Museum. Cat. No. 28972. 
This species is perhaps nearer to R. orientalis Schioedte & Meinert « than to any other known 
species of the genus. It differs from that form, however, in the much larger eyes which are separated 
Fig. 2 . — Rocinela hawaiiensis. (a) General figure, x4; ( b ) Leg of second pair. 
i Naturhistorisk Tidsskrift, (3), xii, 1879-80, 
