120 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
in the small specimens less triangular and rounded laterally. Im the anterior 
segments rudiments of pleopods are either scarcely discernible or visible as very 
low and broad rounded eminences. 
Size. The largest specimen (Fig. 2f) is 4.8 mm. long ; a smaller specimen 
from which the three analytical figures have been drawn, is 3.5 mm. long ; 
a small specimen is only 2.9 mm. long. 
Habitat. The label indicates that the five adult females (with their males) 
were found in the branchial cavity of Galacantha diomedee var. parvispina 
Fax., from Station 3435 (Lat. 26° 48’ 0” N., Long. 110° 45’ 20” W.), 859 
fathoms. In the Report on the Stalk-eyed Crustacea of the ** Albatross ” Ex- 
pedition of 1891, W. Faxon writes (p. 81): “Seven specimens (5 males, 2 
females) of var. parvispina house a Bopyrus in the left branchial chamber.” 
13. Parargeia ornata, n. gen., n. sp. 
Plate VI. Fig. 1-14. 
Only one female and its male are found. 
a. Female. 
The body is much distorted and scarcely 14 times longer than broad, 
Head, It is comparatively very broad, but otherwise of the same shape as 
in Munidion (ante, p. 115). The antennule (Fig. 1b) separated by a frontal 
plate (p), of medium size, 3-jointed; the basal joint comparatively long 
and thick, the second short and narrow, the third exceedingly small. The 
antenns (b) similar in shape to those of Pseudione (see above), but larger 
and 6-jointed ; the basal joint very large, forming about an oblong oval, with 
both margins a little convex ; the second joint is attached at the antero-exterior 
angle of the first, and is tolerably short and slender, yet longer and considerably 
thicker than the third; the three distal joints are exceedingly small. The 
frontal plate (p) rather large, about three times broader than long, anteriorly 
emarginate. The labrum exceedingly large, in the middle very short, but on 
each side forming a large oblique plate (c) which.overlaps the distal part of 
the mandible and the maxillula, and the lateral part of the hypopharynx. 
This organ (h) is triangular and broader towards its base than in the preceding 
forms. The mandibles (d) extend in the middle with their acute tip beyond 
the end of the hypopharynx. Maxillule (e) and maxille (f) need no men- 
tion. The left maxilliped is shown in Figure 1c; the palp consists of a 
prominent basal part and a small terminal joint. The border behind the 
maxillipeds well developed, with two pairs of long, oblique, distally slender 
processes. 
Thorax. Ovarian bosses are found on the four anterior segments ; they are 
oblong, considerably convex, and occupy from less to Thore than half of the 
sub-lateral portion of each segment. By a conspicuous or even deep furrow 
they are set off from the anterior part of the pleural plates, which lie outside or 
more beneath the bosses, are much arched, and look almost like “epimera ” in 
