HANSEN: THE ISOPODA. 109 
Color, The two smaller specimens yellowish white, with a reddish tone on 
a part of the three anterior segments, and the eyes blackish ; the large speci- 
men is more grayish, posteriorly: on the dorsal surface of the last abdominal 
segment and on a part of the uropods reddish brown, the eyes black. 
Size. The largest specimen, a male, is 40.5 mm. long, and 16 mm, broad; 
the two other specimens are immature females, the smallest of them 21 mm. long. 
Habitat. Station 3418 (Lat. 16° 33’ N., Long. 99° 52' 30" W.), 660 fathoms, 
1 specimen; Station 3425 (Lat. 21° 19 N., Long. 106° 24’ W.), 680 fathoms, 
1 specimen;yStation 3430 (Lat. 23° 16’ N., Long. 107° 31’ W.), 852 fathoms, 
1 specimen. 
Remarks. The species is closely allied to R. australis Sch. & Mein., but 
in this last species the eyes are very conspicuously larger and the distance 
between them considerably shorter than the last joint of the peduncle of the 
antennex, the abdomen does not increase in breadth from the base to the fourth 
segment, the last abdominal segment is somewhat smaller and the outer ramus 
of the uropods much broader, about 1% times broader than the inner ramus. 
8. Rocinela modesta, n. sp. 
Plate III. Fig. 3-30. 
Only one somewhat mutilated specimen, a female with marsupium. 
Head. The eyes are rather small, occupying only about half of the lateral 
margin of the head, and the distance between them considerably longer than 
the last joint of the peduncle of the antenne. 
Antennule (Fig. 3). Comparatively long, reaching very little beyond the 
peduncle of the antenne. The peduncle surpasses the middle of the penulti- 
mate joint of the peduncle of the antenne. The flagellum with six joints, 
Antenne. In my single specimen only the peduncles are present. 
Thorax, The epimera essentially as in the preceding species, yet posteriorly 
a little more produced, 
Thoracic Legs. The first three pairs (Fig. 3 a) of medium size, rather slender : 
the fourth joint with from three to four blunt spines ; the sixth joint not as 
broad as the fourth, the expansion on the inner side rather low and short, with 
four feeble spines. The four posterior pairs (Fig. 35) nearly as in the pre- 
ceding species, but the spines are less numerous. 
Abdomen (Fig. 3c). The first segment is completely covered; the second 
quite as broad as the fourth, The last segment is smaller than in the pre- 
ceding species, decreasing considerably in breadth from before the middle 
backward ; posteriorly it is comparatively rather narrow and rounded, with 
some few fine spines on each side of the median line ; the dorsal surface is 
somewhat convex, keeled anteriorly in the median line and with a rather 
deep but not broad depression from that keel outwards almost to the lateral 
margin, 
Uropods (Fig. 3c). The inner ramus surpasses a little the abdomen and 
very little the outer ramus, which is somewhat broader than the other ; both 
VOL. XXXI. — NO, 5. 2 
