162 Bulletin Vanderbilt Marine Museum, Vol. VI 



hook, which fits into that of the opposed leg ; the tip bears also a 

 tuft of bristles. The epipodite is slender, about a third as wide as 

 the meral joint, distally tapered, and extends to the base of the 

 propodus and is beset with long solitary setae on its distal fourth, 

 those at the apex being quite stiff bristles. 



The first pair of ambulatory legs bears a long, thread-like 

 epipodite that extends 0.6 of the length of the meral joint. There 

 are no epipodites present on the fourth and fifth pairs of legs, 

 which otherwise resemble the third pair of legs. The third pair 

 of legs has the merus slender, 2.5 mm. long, 0.5 mm. median 

 width, tapered distally; the carpus 0.8 mm. long; the propodus 

 1 mm. long; the dactyl, unguiculate, 0.4 mm. long, with about 

 three secondary spinules on the inferior lateral margin. The 

 fourth and fifth pairs of legs are successively shorter ; neither has 

 an epipodite; the fifth pair also have the dactyl different from 

 that of the third pair of legs, in the absence of articulated spines 

 on the inferolateral margin and in having the dactyl thickened 

 with a hoof-like basal protuberance, resembling Coralliocaris, 

 but devoid of the dorsal accessory spinule found in that genus. 



The first pair of pleopoda in the male bear a well-developed 

 petasma, strongly resembling Peneu^. Viewed from the posterior 

 left side, as a whole the petasma has a suboval contour; when 

 unfolded, the right and left sides are shown to be slightly differ- 

 ent, the inner lateral margins semiunited and the opposed faces 

 interfitting one upon the other by means of the series of carina- 

 like folds and tooth-like processes shown in the figure. The left 

 half of the petasma has the outer lateral margin convex and folded 

 over on the main portion, forming a semitubular border, the free 

 edge of which terminates anteriorly in a rounded lobe. Inside of 

 this tubular margin, separated from it by a longitudinal sulcus, 

 and extending almost down the center of the organ, there is a 

 second elevated, wide flat process, which also forms a semitubu- 

 lar process and also terminates distally in a rounded lobe, the apex 

 of which is bent inward. Beyond this, the inner half of the organ 

 is a fiat plate, except that three-fourths of the inner lateral margin 

 is narrowly convex and folded inward over this flat plate, termi- 

 nating distally in a triangular process, or tooth, beyond which 

 the inner lateral margin is open for a short distance, thence bears 

 distally, just above the point of attachment of the organ, a small 

 process contiguous with the margin, but with the free edge form- 



