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 antenuse rather short, 7-jointed ; 

 the first joint very thick, the second of about the same length but somewhat 

 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. 1 li) to the 

 seventh (Fig. 1 i) 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 jyrocax 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 lamellae, 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 smaU. The dorsal surface is soft-skinned, the segments 



