106 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
longer than the sixth joint, The four posterior pairs are slender; the fourth 
joint elongate, and considerably longer than the fifth, 
Abdomen. The first segment partly covered, very conspicuously broader 
than the fourth. The last segment (Fig. 4 d) 14 times broader than long ; the 
tip acute, but scarcely produced ; the posterior margin with six to eight small 
serratures, with scarcely visible spines on each side of the apex ; the dorsal sur- 
face slightly convex, the faint median keel and the sub-lateral impressions 
almost as in 4%. maxima (see supra). 
Uropods (Fig. 4d). They reach somewhat beyond the apex of the abdomen, 
the outer ramus almost or quite attaining the end of the inner one. The inner 
ramus relatively broad, scarcely half as broad as long, of a somewhat triangular 
shape ; the posterior margin considerably shorter than the antero-interior one, 
with seven or eight rather fine serratures; the exterior margin with a break at 
some distance from the acute tip, and two or three serratures between the tip 
and the break, the rest of the margin almost straight and smooth. The outer 
ramus is conspicuously narrower than the inner, yet rather broad, the apex 
acute, not produced. 
Color. The dorsal surface yellowish white, the eyes gray, somewhat 
blackish. 
Size. The largest specimen, a female with marsupium, is 37 mm. long and 
17 mm. broad; the smallest female with marsupium is but 22 mm. long ; 
the single male is 23.4 mm. long and 10.5 mm. broad. 
Habitat. Station 3363 (Lat. 5° 43’ N., Long. 85° 50’ W.), 978 fathoms, 
4 specimens ; Station 3371 (Lat. 5° 26’ 20” N., Long. 86° 55’ W.), 770 fathoms, 
l specimen; Station 3402 (Lat. 0° 57’ 30” S., Long. 89° 3/ 30” W.), 421 
fathoms, 1 specimen. 
Remarks. The species is closely allied to Æ, ventrosa M. Sars, but in the 
last named. species the frontal plate is lower and of another shape, the eyes are 
more narrow, not occupying so much of the dorsal surface of the head, the 
epimera of the sixth, and especially those of the seventh segment are consider- 
ably more produced, and the outer ramus of the uropods is somewhat broader. 
6. Miga longicornis, n. sp. 
Plate II. Fig. 5-56; Plate III, Fig. 1-1 a. 
Only one specimen, a female without marsupium. 
Head. The frontal margin with the sub-median curves rather faint; the 
median process as in the preceding species, The frontal plate forms a very 
high transverse keel, which, when the head is seen from in front, protrudes 
strongly beyond the basal parts of the antennule and the antenna, and has a 
straight inferior margin and rounded lateral angles. The eyes (Fig. 5) com- 
paratively narrow, the shortest distance between them a little shorter than 
the basal joint of both antennule and the breadth of the frontal process 
together. 
