182 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



regions. Second segment with naked seta on middle of posterior 

 surface, 12 naked setae on distal surface (fig. 12a). 



Antennule of male similar to that of female except bifurcate process 

 present on first segment more distinct, dentate instead of crenate as 

 in female (fig. 126). 



Second antenna of female thi'ee-segmented, attached to ventral 

 surface just anterior and medial to postantennal process and posterior 

 and lateral to base of antennule. First segment short, forming broad 

 articular surface for second segment. Fii'st segment with posteriorly 

 directed, spinelike projection from posterior proximal surface. Sec- 

 ond segment strongly developed, greatest width equal to greatest 

 length. Third segment slender, heavily chitinized, with strongly 

 developed, sharply curved, spinehke terminal process. Third seg- 

 ment also with two naked, seta-like accessory processes, one from 

 inner surface of proximal region, second from distal lateral surface. 

 Division between third segment and terminal process visible though 

 incomplete (fig. 12c). 



Second antenna of male three-segmented. First segment broader 

 proximally than distally, attached to cephalothorax along entire length 

 of proximal surface. Distal end of first segment small, two-pronged, 

 forming articular sm"face for second segment. First segment with 

 adhesion surface of heavily chitinized, overlapping, plateUke struc- 

 tures along major portion of outer lateral surface. Second segment 

 strongly developed; greatest width, in proximal region, slightly more 

 than half greatest length. Outer margin strongly convex proximally, 

 inner margin irregular due to presence of two sets of adhesion surfaces 

 similar to those of first segment. Inner distal sm-face of second 

 segment with finger-like protrusion; protrusion appearing segmented 

 but segment-like structures probably comparable to heavily chitinized, 

 platelike structiu'es of other adhesion surfaces. Fingerlike protru- 

 sion not mentioned by Wilson (1905), Yeatman (1957), or Shiino 

 (1959), but present on material identified by Wilson and Yeatman as 

 L. dissimulatus. Protrusion in most specunens curved around second 

 segment and appearing as regular adhesion surface but process not 

 attached to second segment except at proximal end. Third segment 

 with bifurcate terminal process, also with single, naked, seta-like 

 accessory process from distal end (fig. \2d). 



Mandible of female and male four-parted. Fii'st part slightly 

 wider proximally than distally, with even taper to junction of second 

 part. Second part shortest of four, tapered evenly from junction of 

 first to junction of slender third part. Third part rodlike, length 

 almost equal to combined lengths of first two parts. Fom"th part 

 slightly longer than second, flattened laterally, slightly thicker along 



