Decapod Crustacea of Bermuda, Part II. 55 



numerous incurved hairs ; the claw is wide at base and acuminate, 

 with a sharp incurved tip ; opposed to it there are two small 

 spinules. The pleopods are elongated ; in the male those of the 

 first pair bear a petasma, which is prominent, convex, somewhat 

 cap-shaped, inner end with an overhanging top ; outer end with a 

 prominent tubular lobe, often nearly touching a small tubercle 

 standing in front of it. It has internal muscles and is capable of 

 considerable changes in form. The distal tubular part can In- 

 protruded or withdrawn more or less. (See pi. 18, figs. 6-9.) 



The second pleopod of the male has a third branch, or male 

 organ (pi. 18, figs. 5, 50), which is about as thick as the other 

 branches, and about half as long; its outline is slightly sigmoid. 

 with a basal enlargement, distal to which there is a group of about 

 three short curved setae on the outer side, otherwise it is not hairy ; 

 other branches are very hairy. The sixth abdominal segment is 

 about as long as the sum of two preceding ; distally it is rapidly 

 narrowed ; in the male the lateral ventral side bears two con- 

 spicuous spines, the second about twice as long as the first, both 

 somewhat directed backward; second not acute at tip; distance 

 between the spines about equal to distance of the second to end of 

 segment ; dorsal median distal edge bears a small acute spinule ; 

 distal ventral edge in some, at least, bears a pair of small spinules, 

 often blunt. 



In the female the sixth segment has a constriction or slight 

 transverse groove, in the middle, as if composed of two articles ; 

 its ventral side, further back, bears a pair of very small acute 

 spinules, close together. 



The uropods of both sexes are relatively large and long; they 

 have two acute basal spines ; the outer lamella is about one-third 

 longer and twice wider than the inner, long-elliptical, with the end 

 obtusely rounded or slightly emarginated near the base of the 

 small acute spinule on the outer distal edge, which is equal to or 

 a little longer than the tip of the lamella, sometimes projecting its 

 entire length ; the inner edges of both lamellae have a fringe of 

 long slender hairs ; inner one is about half as wide and two-thirds 

 as long as outer, and more acute. The telson is narrow ; in the 

 male about half as long as the inner uropods, one-third the outer 

 branch ; seen in profile it is thickened proximally, and has the 

 proximal half of the edge turned up. In the male it bears at .about 

 the distal fourth, on the under side, a rounded tubercle (perhaps a 



