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 bro-ft-n, the eyes black. 



Size. The largest specimen, a male, is 40.5 nun. 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' >r., Long. 99° 52' 30" W.), 660 fathoms, 

 1 specimen; Station 3425 (Lat. 21° 19' X., Long. 106° 24' W.), 680 fathoms, 

 1 specimen; Station 3430 (Lat. 23° 16' N., Long. 107° 31' W.), 852 fathoms, 

 1 specimen. 



Remarlcs. 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 

 antennae, 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 If times broader than the inner ramus. 



8. Rocinela modesta, n. sp. 



Plate in. Fig. 3-3 c. 



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 antennae. 



AntennulcB (Fig. 3). Comparatively long, reaching very little beyond the 

 peduncle of the antennae. The peduncle surpasses the middle of the penulti- 

 mate joint of the peduncle of the antennae. The flagellum with six joints. 



Antennce. 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. 3 6) nearly as in the pre- 

 ceding species, but the spines are less numerous. 



Ahdoraen (Fig. 3 c). The first segment is completely covered ; the second 

 quite as broad as the fourth. The la.st segment is smaller than in the pre- 

 ceding species, decreasing considerably in breadth from before the middle 

 backward ; posteriorly it is compai-atively rather narrow and rounded, ^nth 

 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. 3 c). 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 



