164 



SCLEROSTOMA HYPOSTOMUM. 

 Plate XXIII. 



Fig. 1. Male, XB. Fig. la, natural size. 



Fig. 2. Female, xB. Fig. 2a, natural size. 



Fig. 3. Head, ventral view : a, the capsule ; ?», the dorsal canal ; c, lateral ducts; d, 

 cBSophagus. 



Fig. 4. Head, lateral view : a, c, d, as in Fig. 3; f, the three head-papill;e; /, the coiu- 

 luon duct of the joined unicellular gland ducts is placed near the ventral 

 cleft; g, the end of the cesophagus, showing three dependent lips; h, the 

 cut-end of the skin. The drawing shows the longitudinal muscular baud, 

 separated into two groups by the lateral canals, i, i, and the three separa- 

 tions of the muscular bundles between these canals which appear on the 

 surface as lines : k, k, k, cut end of the intestine. 



Fig. 5, Head, dorsal view: a, b, c, and d as in Fig. 3. 



Fig. 6. Month end of lateral half of chitiuous capsule: a, a, a, the ventral, lateral, 

 and dorsal head papilhe; h, the dorsal canal which continues around the 

 head in c, c; d, the mouth, around which is a circle of small thorn-like 

 teeth, about forty in all. 



Fig. 6a. Teeth enlarged. 



Fig. 7. Caudal end of capsule : a, the cut wall ; h, the dorsal canal ; c, the triangu- 

 lar opening of (esophagus. 



Fig. 8. Section of oesophagus: a, a, a, tho cliitin'ous ,sui)i)ort; h, h, b, the walls, c, 

 the orifice. 



Fig. 9. Male bursa with spicnla. 



Fig. 9a. Portion of spiculai : a, the chitinons cylinders; b, tlie membranous margins. 



Fig. 96. Diagram of anal papilho. 



Fig. 10. Bursa spread out: a, ventral costie ; b, lateral; c, dorsal; d, the torn edge. 



Fig. 11. Caudal end of female: a, anus; /*, vulva; c, o, uteri; d, d, loops of the 

 ovaries; e, e, the intestine; /, a dark brown pat(;h usually found on the 

 vulva ; g, an egg. 



Fig. 12. Cross-section of female: a, intestine; b, ovaries; c, lateral ducts; d, muscu- 

 lar bundles (Leuckart). 



Figs. 3, 4, 5, and 6 are somewhat distorted by flattening. 



