346 REPORT OF NEW JERSEY STATE MUSEUM. 



larger in proximal part. Low lengthwise rib on upper surface 

 of each linger, this rib edged with rows of punctures, though 

 becoming indistinct on movable finger in old males. Carpus 

 slightly longer than wide, shorter than palm, deep longitudinal 

 sulcus above, inner edge with strong pointed or blunt spine 

 usually hooked distinctly or formed at right angle, though distal 

 part curves forward. Small spine or tubercle sometimes double, 

 may also be proximal. Carpus below with blunt conic tubercle 

 in middle of front edge, sometimes spine-like, and tubercle at 

 articulation with hand usually obscure. Sometimes other tuber- 

 cles present, one often as small spine between large one on 

 inner edge and that on front edge of lower side. Merus smooth, 

 with one to three tubercles near distal end of upper edge, one 

 often spine-like in young, indistinct or absent in old examples- 

 Lower side of merus with two rows of spine-like tubercles. 

 Outer rows of one to six tubercles, very rarely only one and 

 usually two or three. Inner row of six to eleven spiniform 

 tubercles, distal largest. Small tubercle on outer articulation 

 with carpus present or wanting. Ischium of third perccopod 

 hooked in male, and hook of first formed strong and partly conic. 

 Coxa of fourth peraeopod in male with prominent rounded 

 compressed tubercle. 



First pleopods in male of first form stout, short, reach 

 hind edge of coxa of third perccopods, not articulated bas- 

 ally, the two parts separated at tips for short space, both 

 curved sharply back to form almost right angle with basal 

 part, and distally partly twisted so that outer part directly an- 

 terior to inner. Outer part horny, compressed, falciform, tip 

 pointed and with small posterior accessory point, its tip often 

 abraided. Inner part soft, swollen basally and tapers suddenly 

 to blunt point. Annulus ventralis of female transversely rhombi- 

 form, with deep central depression and longitudinal sigmoid 

 fissure. Anterior and especially hind edges elevated, so that 

 form often appears depressed, and where lengthwise fissure 

 passes over hind edge latter slightly depressed. In young fe- 

 males central depression less marked. 



