NO. 19 1: 



.1 NEW DISCODRILID WORM—ELLIH. 



483 



tion in the median line, which may be entirely wanting; dental 

 plates very dark-brown to black, situated at or just in front of 

 the junction of the first and second cephalic annulations; dorsal 

 plate rouglily triangular in outline when seen from the front, mid- 

 dle portion of the base excavated so that the two corners extend 

 beyond the rest of the plate as two horns, anterior face with two 

 rather prominent teeth on each side near the edge of the plate, the 

 tooth nearer the apex on each side being pointed and larger than the 

 basal tooth, apex produced into a single large cylindrical tooth witli a 

 conical point; ventral plate 

 with an excavated base like 

 that of the dorsal plate, the 

 anterior face bearing a sin- 

 gle small knob-shaped tooth 

 on each side near the base, 

 apex produced into two 

 large cylindrical teeth, each 

 with a conical point. 



Pharynx narrowing just 

 behind the dental plates, 

 witli a distinct dorsal diver- 

 ticulum near the junction of 

 the second and third cepha- 

 lic annulations and a ven- 

 tral diverticulum slightly 

 caudad, the mouths of the 

 two diverticula producing 

 an irregular enlargement of 

 the pharynx in the third 

 annulation; esophagus nar- 

 row, occupying the first 

 body segment, near the mid- 

 dle of which it drops to the 

 floor of the body cavity; 

 crop or post - esophageal 

 portion of the alimentary 

 canal extending througli segments 2 and 3, rising gradually to the 

 center of the body, increasing steadily in diameter, caudad, and show- 

 ing little or no constriction at the junction of segments 2 and 3 unless 

 distended with food; stomach large, almost filling segment 4, marked 

 off by definite constrictions; intestine proceeding as a straight tube 

 of slightly less diameter than that of the stomach through the center 

 of segments 5 and 6; in segment 7 becoming somewhat narrowed, 

 swinging dorsally and to the left side of the body in the anterior por- 

 tion of the segment, and returning much narrower to the right of the 



Fig. 4.— Cambaeincola macrodonta. Reconstriction 

 to scale from sections of the genital tracts of 

 segments 5 ani> 6 seen from the right .side of the 



ANIMAL. A, SPERMATUECA; B, ACCESSORY SPERM TUHE; 

 C, ANTERIOR PAIR OF VASA DEFERENTLi; D, POSTERIOR 

 PAIR OF VASA DEFERENTIA; E, SPERMATIC VESICLE; ¥, 

 OPENING OF THE PENIS. 



