Description of the female of Clmrdodes albibarbatus Montp. 495 



cuticiila. Beneath iniiiiy of thosc i)apillac arc foiind oue (soinetinies 

 twü or tliree) dear, oval or rouiuled Spaces, which are sunk iuto tho 

 surfacü of thc fibrous cuticle; it is such papillac, which on surface 

 vicw show a central clear space. 4) Slender, hyaliue processes, club- 

 shaped or finger-shaped, of greater height thau the 3rd kiud of 

 l)apillae ; these occiir siiigly and sparingly, and are similar to those 

 found in raost other species of Chordodes (d Fig. 1). 5) Hyaline, 

 translucent, yellowish spines, which are eveu less numerous than the 

 4th kind of prominences (e Fig. 4). These are placed usually at an 

 angle to the surface of the body, are largest at the base, which is 

 enlarged and rounded except for a terminal concavity. They are more 

 or less hook-shaped in outline, and are most slender at the distal 

 end, this portion niaking an angle with the proximal part. The basis 

 does not lie within the fibrous cuticula, but is situated in a rounded 

 depression in the surface of the latter; that is to say, the layers of 

 the fibrous cuticle are beut inward at this point. 



The groups of high papillae are not found on the head, uor ou 

 the terminal portion of the posterior end. 



Form. Body stout, nearly cylindrical with median grooves; 

 anterior third the narrowest, becoming more slender towards the head 

 end (Fig. 5), which is pointed, with a truncated tip. Posterior end 

 (Fig. 6) of less diameter than the raiddle of the body, separated off 

 by a constriction, spherically rounded and of greater diameter than 

 the immediately preceding portion ; this form is that generally charac- 

 teristic for females of this genus. Cloacal aperture nearer the ventral 

 than the dorsal margin, placed in the centre of a circular depression. 

 Seen from the side the posterior end appears truncated. 



Color. A deep chocolate-red, not mottled or spotted, lighter 

 anteriorly. Tip of the head and the knob-shaped posterior end, light 

 yellow. The cuticular hairs are white. 



Dimensions. Length 215 mm; greatest diameter 2 mm. 



Comparisons. This specimen is undoubtedly the female of 

 Chordodes albibarbatus Montg., though it ditfers from the latter (be- 

 sidcs differences in form) in color, and in that the summits of the 

 lowest papillae are rauch more dentate in appearance. In my de- 

 scription of the male, I had overlooked the cuticular spines, but ou 

 now studying again the sections of that specimen I find them to be 

 present, but less numerous than in the female. 



This species differs from the most closcly allied ones as follow ; 



1) C. halsani Camekano (from Bolivia) approaches nearcst to 



