i68 coE 



mm. in length, and .04-.05 mm. in diameter near base; central stylet 

 .045-.055 mm. long. 



Retractor muscle of proboscis attached to the dorsal wall of the 

 sheath at about two-thirds the distance from head to posterior extremity 

 of body. Proboscis of large size, provided with ten large and con- 

 spicuous nerves. 



Body Walls. — The pigment of the four dark longitudinal lines 

 appears perfectly black in mounted sections, and is always very con- 

 spicuous. It is situated in the basal portions of the integument. 



Cephalic glands are well developed, and fill up a considerable por- 

 tion of the tissues of the head in front of the brain. 



Alimentary Canal. — A pair of broad diverticula of the intestinal 

 caecum extends forward above, and a little in front of the dorsal brain 

 lobes. Shortly behind the brain the two diverticula join the broad 

 unpaired CEecum which lies beneath the esophagus. This latter por- 

 tion of the alimentary canal swells out into a large chamber immedi- 

 ately behind the brain, while its slender posterior portion (pylorus) 

 does not empty into the dorsal wall of the intestine until well behind 

 the most anterior sexual glands. The broad intestinal cjecum sends 

 off a few pairs of large diverticula. The most posterior of these ex- 

 tend between the anterior sexual glands, while the most anterior pair 

 terminates above the dorsal ganglia, as mentioned above. 



Nephridia. — The neiDhridial system is remarkable for its short 

 extent and for the fact that the efferent ducts open on the head immedi- 

 ately beside the dorsal ganglia. The nephridial tubules lie above the 

 anterior portions of the lateral nerves^ but do not extend more than a 

 very short distance behind the brain. A few branches also ramify 

 beside and a little in front of the dorsal ganglia. The efferent ducts 

 are rather large, and open -on the sides of the head about on a level 

 with the middle portions of the dorsal ganglia. 



\ Cerebral Sejise Organs. — These are of moderately large propor- 

 tions. They lie a little in front of the brain and somewhat nearer the 

 ventral surface. The ducts communicating with the exterior pass an- 

 teriorly to open on the vcntro-lateral aspects of the head as usual. 



The lateral nerves unite above the posterior end of the alimentary 

 canal . 



Reproductive Organs. — The sexual products were found to be 

 nearly mature in August. As in most species of the genus, the sexual 

 glands are very voluminous, and occupy the greater portion of the body 

 in the intestinal region. As stated above, the most anterior sexual 

 pouches lie some distance in front of the opening of the esophagus into 



