1901,] NATURAL SCIENCES OF PHILADELPHIA. 113 



convex side; the posterior mar gin abruptly falling near the joint, a 

 prominence bearing a group of small tubercles at the summit before 

 the deflection. Inner surface or palm (fig, 2) much less convex, 

 becoming concave near the lateral margins, nearly smooth, the 

 anterior margin slightly excavated between the root of the fixed 

 finger and the dactyJopodite, and bordered there with a short row 

 of small tubercles. On the median portion of the palm there are 

 two punctures, marking it off into thirds longitudinally. Lateral 

 margins of the propodite acute, closely, finely and regularly crenu- 

 late; the lower margin S'traight, with a row of punctures along the 

 inner side but extremely near the edge, and another less close to 

 the edge outwardly; upper margin deeply curved down posteriorly, 

 produced into a deflexed lobe, and similarly margined Avith spaced 

 punctures. Fixed finger about one-third the total length of the 

 whole propodite, curved at the tip, finely crenate along the grasp- 

 ing margin when unworn, and with a blunt median tooth. 



Dactylopodite with two contiguous crenulate carinte along its 

 outer edge, 



Carpopodite (PI. I, figs 5, 6) somewhat shorter than the palmar 

 surface of the propodite, equally convex inside and out, turgid 

 anteriorly, its outer face with an oblique groove bordered with 

 small tubercles near the distal lower angle. Posterior upper angle 

 produced backward in a rather slender process, 



Meropodite (PI, I, fig, 7) subtriangular in section, the upper 

 keel strongly arched, lower keel nearly straight and more strongly 

 serrate, the middle of the very convex outer surface granulose, 

 with two rounded tubercles at the anterior extremity; the opposite 

 or inner face nearly flat. In all specimens preserved with the 

 member.'? in place, the meropodite is flexed at a right angle with 

 the carpopodite. 



Measurements of propodite, in millimeters. 



Length. Length exdmivs Width in the fj,i,j,,,,,,^ 



^ of jinger. middle. 



(.') — 29 19 9.5 



(6) 25 18 11 6 



The left chela of another specimen measures: Total length of 

 propodite 27, palmar surface (without finger) 20 mm.; width in 

 middle 13 mm.; greatest length of car])opodite, measured obliquely 

 20, or from middle of distal to middle of proximal margin 



