160 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



thirds length of first part, tapering sUghtly to junction witli third 

 part. Third part elongate, slightly swollen at junction of fourth part. 

 Fourth part short, curving inwards, inner margin with 13 denticula- 

 tions (fig. 6j). 



Postantennal process of C. randalli a simple, curved, spinelike 

 process situated slightly lateral and posterior to second antenna and 

 directed ventrally and posteriorly; with small, naked, chitinous pro- 

 jection and single nodule bearing two long setules present on inner 

 proximal surface (fig. Qk). 



Postantennal process of C. constr ictus similar to C. randalli though 

 with two setule-bearing nodules and two minute spinules on inner 

 proximal surface. 



Postoral process of C. randalli basically single, sharply pointed 

 process curving laterally from origin adjacent to base of mouth cone, 

 with membrane continuous around sharply pointed distal end but 

 with single lateral projection on inner margin giving bifurcate appear- 

 ance to process. Base of process with nodule bearing two setules 



(fig. 60. 



Postoral process of C. constrictus with two projections from inner 

 margin instead of one, without membrane around distal end of process. 



Maxilla of C. randalli tv^^o-segmented, attached just lateral and 

 posterior to postoral process. Length of first segment slightly more 

 than four times greatest width; lateral margins parallel through 

 most of length, projection of inner proximal surface forming articular 

 surface. Distal margin of first segment with several lobes forming 

 articular surfaces for second segment. Cluster of three lobes on outer 

 part of surface forming irregular distal concavity for ball-shaped 

 proximal end of second segment. Second segment elongate, length 

 slightly greater than that of first segment. Middle of second segment 

 tapered slightly, bearing folded, membranous margin and row of 

 setules. Inner of two terminal spines 1.3 times length of outer spine, 

 with frilled membrane on outer and inner margins. Outer spine also 

 with frilled membrane on outer and inner margins (fig. Qn). 



Maxilla of C. constrictus similar to that of C. randalli though lobate 

 distal margin replaced by slight depression. 



Maxilliped of C. randalli two-segmented, situated slightly posterior 

 and medial to maxilla. First segment well developed, with large 

 projection of inner proximal surface serving as articular surface. 

 Inner surface of segment with concave depression. First segment 

 with small, lobate projection from posterior surface just proximal 

 to middle of segment. Distal surface of first segment irregular, with 

 several heavily chitinized articular surfaces. Second segment short, 

 with long, strong, falciform terminal process; length of second segment 

 and terminal process about two-thirds length of first segment. Second 



