122 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
3-jointed ; the basal joint thick, the second shorter and much narrower than the 
first, the third short and very slender. The antenn® rather short, 7-jointed ; 
the first joint very thick, the second of about the same length but sömewhat 
more slender, the third somewhat shorter and more slender than the second, 
the fourth rather short and very slender; the three distal joints exceedingly 
small. The mouth forms a basally broad, somewhat protruding oblique cone, 
but without a dissection I was not able to recognize several of the parts with 
any certainty ; the figure will show what I believed I saw. 
Thorax. The segments much arched on the dorsal side, the incisions between 
them of medium length, and most of them very narrow; their lateral margin 
is, when seen from the side, much more rounded than if seen from above. No 
ventral cones, The legs increase somewhat in length from before backward, 
but at the same time their hand decreases in size from the first (Fig. 1h) to the 
seventh (Fig. 14) pair, and besides alters conspicuously in shape. 
Abdomen. It occupies somewhat more than one fourth of the length of the 
animal; its outline is described above. All segments are completely fused, so 
that only some transverse, partly very indistinct furrows, but no sutures, are 
found on the dorsal surface. About half way between the median line and the 
lateral margin the dorsal surface presents a broad longitudinal depression, and 
in the median line a little behind the anterior margin a prominent knot. The 
ventral surface does not seem to be quite normal, but the following characters 
certainly are of importance: no rudiments of pleopods are to be discovered, 
but in the median line are found three protuberances: the first small, the 
second rather large, the third shaped as a short transverse keel. 
Size. The specimen is 4.1 mm. long. 
Habitat. In the branchial cavity of Sclerocrangon procax Fax., from Station 
3418 (Lat. 16° 33° N., Long. 99° 52’ 30” W.), 660 fathoms, 1 female with a 
male, 
14. Bathygyge grandis, n. gen., n. sp. 
Plate VI. Fig. 2-2 c. 
Only a male, and the posterior part of a female have been sent to me, 
a. Female. 
The rudiment consists of the posterior part of the thorax, bearing three legs 
on one and two on the other side, and the abdomen. 
Thorax. The pleural plates are very large oval lamella, only connected with 
the segment by somewhat less than the posterior half of their interior margin, 
and this result is due to the fact that they anteriorly are very much produced, 
highly overlapping each other, and posteriorly rather shortly produced. The 
legs are tolerably slender; the second joint not expanded ; the fifth joint elon- 
gate, in the last pair as long as the hand. 
Abdomen. It is turned to the left in a startling degree, and is proportionally 
small, — perhaps very small. The dorsal surface is soft-skinned, the segments 
