106 BULLETIN: MUSEUM OF COMPAEATIVE 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) 1^ 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 sHghtly convex, the faint median keel and the sub-lateral impressions 

 almost as in JE. riicucima (see supra). 



Uropods (Fig. 4 d). 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 niarsupium, is 37 mm. long and 

 17 mm. broad ; the smallest female with niarsupium 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, 

 1 specimen; Station 3402 (Lat. 0° 57' 30" S., Long. 89° 3' 30" W.), 421 

 fathoms, 1 specimen. 



Remarlis. The species is closely allied to .^. 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. ^ga longicornis, n. sp. 



Plate II. Fig. 5-5 6; Plate III. Fig 1-1 a. 



Only one specimen, a female without marsupium. 



Head. The frontal margin -\sdth 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 antennulse and the antennse, 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 antennulae and the breadth of the frontal process 

 together. 



