164 



SCLEROSTOMA HYPOSTOMUM. 

 Plate XXIII. 



Fig. 1. Male, X8. Pig- la, uatural size. 



Fig. 2. Female, x8. Fig. 2a, uatural size. 



Fig. 3. Head, ventral view : a, the capsule ; h, the dorsal canal ; e, lateral ducts ; d, 

 oesophagus. 



Fig. 4. Head, lateral view : a, c, d, as in Fig. 3; e, the three head-papilla3; /, the com- 

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

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

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

 separated into two groups by the lateral canals, i, i, aud 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, e, and d as in Fig. 3. 



Fig. 6. Mouth end of lateral half of chitiuons capsule: a, a, a, the ventral, lateral, 

 and dorsal head papilhe; 6, 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. 6(1. Teeth enlarged. 



Fig. 7. Caudal end of capsule : a, the cut wall ; 6, the dorsal canal ; c, the triangu- 

 lar opening of oesophagus. 



Fig. 8. Section of oesophagus : a, a, a, the chitinou.s support ; b, b, b, the walls, c, 

 the orifice. 



Fig. 9. Male bursa with spicula. 



Fig. 9a. Portion of spiculfe : a, the chitinous cylinders ; ft, the membranous margins. 



Fig. 9b. Diagram of anal papilhe. 



Fig. 10. Bursa spread out: a, ventral costie; 6, lateral; c, dorsal ; d, the torn edge. 



Fig. 11. Caudal end of female: a, anus; 6, vulva; e, c, uteri; d, d, loops of the 

 ovaries ; e, e, the intestine ; /, a dark brown patch 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. 



