404 PROCEEDINGS OF THE NATIONAL MUSEUM vou 89 



Antennal scale large, extremely broad; broadest in middle. Spine 

 on outer distal margin strong, extending anteriorly almost to tip of 

 rostrum. 



First right pereiopod slender, entirely tuberculate; palm oval, de- 

 pressed dorsoventrally. Median dorsal ridge along each finger; outer 

 margin of immovable finger with distinct ridge. 



Movable finger: Inner margin with about 18 corneous and knob- 

 like tubercles along proximal half, the sixth from base the largest; 

 minute denticles along entire inner margin. Mesial margin with 

 about 17 tubercles. Dorsomedian ridge flanked by small irregularly 

 spaced tubercles along proximal half. Distal half flanked by a row 

 of setiferous punctations on either side. Finger terminates distally 

 in a sharp, corneous tip bent laterad and extending below the tip of 

 immovable finger when the fingers are closed. 



Immovable finger with inner dorsal margin bearing about 13 

 corneous tubercles, the third and fifth largest. Between the eleventh 

 and twelfth tubercles a large corneous tubercle extends from the 

 ventromesial margin, and when the fingers are brought together the 

 movable finger passes above it. Distad of this tubercle and in the 

 same line are two smaller tubercles. Entire mesial margin with 

 minute denticles. 



Carpus longer than broad, shorter than inner margin of palm of 

 chela; a shallow, oblique longitudinal groove above; tuberculate 

 except on ventral surface. 



Merus tuberculate except along the proximomesial and proximo- 

 lateral surfaces. Ventral side crowded with spikelike tubercles. 



Ischiopodites of third and fourth pereiopods bearing hooks. Hooks 

 corneous; both recurved toward the base of ischiopodite distally. 

 Hook on fourth pereiopod heavier. 



First pleopod extending to base of third walking leg; tip ending in 

 four distinct parts, as follows: The mesial process, a long, extremely 

 slender spine, projects posteroventrally and is bent at about a 50° 

 angle with the main shaft. The cephalic process, also spiniform, 

 rises from the anterior margin and projects in a direction almost 

 parallel to the mesial process. The central projection consists of two 

 processes: A centrocaudal process, which is contributed from the 

 cephalic process laterally, forming the caudal entity; a centrocephalic 

 process arising from the center of the appendage and making up the 

 cephalic entity ; these two are fused into a triangular platelike process 

 (viewed laterally) bent in the same direction as the mesial process, 

 this triangular process being the largest of the four terminal parts. 

 The caudal process also consists of two parts: A mesial, bladelike, 

 corneous structure directed obliquely anterolaterally and postero- 

 mcsially; a small corneous, triangular structure just posterolaterad 

 of, and at the base of, the central projection. The central projection 

 and the caudal process are corneous. 



