r.\Mi:Al;rs. 

 48. Cambarus spinosus. 



Plate IX. MRS. 7, 7', 7 a, 7 11' <iii-i ftbdomJoal ip] ol ui;ii<'>. 



<',ti,ilnti-nx x/ii/tnx/ix, 111 Mil. 1'rnr. \rail.Yil Sci. I'liil.-i. I , , |. I?!!. 

 iix. !' \\IIN, I'nuv Anirr. Acail. Arts ami Sri.. \\. ll\ 



Male, form II. Rostrum broad. excavated, the raised margins parallel 

 and continued back on the carapace between the post-orbital ridges, ;m 

 impressed ciliated line on each margin; acumen long, acute, with well- 

 developed lateral teeth at base. Post-orbital ridges sulcate without, wiib 

 short anterior spines. Carapace ovoid, smooth and punctate above, lightly 

 granulated and ciliated on the sides, lateral spines single, long, acute; cervi- 

 cal groove not sinuous; small branchiostegian spines; front border of cara- 

 pace a little angulated behind the antenna) ; areola moderately wide, of 

 equal width before and behind, punctate, equal in length to half the dis- 

 tance from cervical groove to lateral rostral spines. Abdomen equal to the 

 cephalothorax in length, mostly smooth, proximal segment of telson hispi- 

 nose on each side. Epistoma wide, emarginatc in front. Antenna; long (as 

 long as the body or longer) ; scale as long as the rostrum, narrow, widest 

 in the middle, thence tapering gradually to the long, sharp, apical tooth ; 

 external border inflated, turned outward at the distal end. Third pair of 

 maxillipeds hairy without, naked below. Chela of moderate size, punctate 

 above, smooth below, a double row of ciliated tubercles on the inner border 

 of the hand; fingers of moderate length, slightly gaping at base, costate 

 and ciliate-punctate, toothed and ciliate on inner border ; outer margin of 

 movable finger with two or three rows of tubercles. Carpus tuberculate 

 above, internal border with a large, curved, sharp median spine, and a small 

 anterior and posterior spine; below there is a large median spine on anterior 

 margin, and a smaller one at the point of articulation with the hand. Mcros 

 with two obliquely disposed spines near the distal end of superior border; 

 the outer row of the biserial spines beneath consists of the two distal spines 

 alone. Third pair of legs hooked. Anterior pair of abdominal appendage- 

 very long, reaching forward to the base of the large claws, deeply bilid, rami 

 slender, blunt-pointed, outer ramus longer than the inner, a little recurved 



at the tip. 



Male, form I. According to Bundy, the hooks on the third legs are 

 larger; first pair of abdominal appendages ''strongly bilid, tips of equal 

 length, very slender, straight, separating at node; anterior margin with a 



