420 PROCEEDINGS OF THE NATION-U:. MUSEUM too. 89 



movable finger with a row of about 8 small tubercles along proximal 

 three-fifths. Lateral margin with only one small tubercle near base, 

 but crowded with minute denticles along entire length. Dorsoprox- 

 imal and ventroproximal surfaces with a few small tubercles, otherwise 

 setose-punctate. 



Carpus longer than wide: Ratio about 9:5, shorter than inner margin 

 of chela, a very shallow longitudinal groove above, and entirelj'' tuber- 

 culate. Tubercles on mesial and mesiodorsal surface larger and more 

 acute. Two sharp spines on antero ventral margin. 



Merus with a row of about 20 tubercles along dorsal margin, pro- 

 gressively larger and more acute from proximal to distal margins. 

 Distad of middle they are flanked by smaller ones. Lateral and mesial 

 surfaces sparsely punctate; about 14 spines along ventromesial margin, 

 and 10 to 15 in an irregular row along ventrolateral margin. A row of 

 3 tubercles (the more distad the largest) along the distal midventral 

 margin. 



Ischiopodites of the third and fom-th pereiopods hooked. Hooks on 

 the third simple, straight, extending back over the distal part of basio- 

 podite. Hook on the fourth pereiopod approaches a trituberculate 

 condition. Basiopodite of the fourth pereiopod bears a large tubercle 

 on the distomesial msrgin opposing the hook. 



First pleopod extending to middle of coxopodite of third pereiopod, 

 a rounded hump on midposterior surface, and another at distal one- 

 third of anteroraesial surface. Tip terminating in four distinct parts, 

 as follows: The mesial process, which is long, slender, and spiniform, 

 extends caudoventrally. The cephalic process, also spiniform, extends 

 in the same direction and extends distad of the other processes. The 

 central projection consists of two parts: The centrocaudal part con- 

 tributed from the cephalic process, and the centrocephaiic process 

 arising from the center of the appendage, the tv^'o fused into a small, 

 acute, platelike structure and bent slightlj- more mesad and caudad 

 than the mesial and cephalic processes. The caudal process is made up 

 of three parts: A larger, lateral, knoblike structure; a mesial plate- 

 like structure, convex mesially; a small, acute, plateiilvo spme, which 

 rises from between the last two mentioned structures and extends 

 approximately parallel to the mesial and cephalic processes and to the 

 central projection, which exceed it distally. The central projection 

 and caudal processes are corneous. 



Male {form. II). — With reductions in most of the spiny and corneous 

 portions disregarded, the description of the male, form I, is adequate 

 for the second-form male with the following exceptions: Anterior 

 section of telson with four spines in each of the posterolateral corners ; 

 epistome with base angular, both sides slightly concave, spine on 

 anterior edge not acute; first pleopod with no corneous tips and a 

 much-reduced caudal process, a small tubercle indicating the presence 



