238 Stephanochasmus Looss 
Explanation of the Figures. 
All the drawings except Figs. 8, 9 and 10 were made with the aid 
of the camera lucida. 
1. Acetabulum. 2. Basal disc of cuticular spines. 3. Bulbous base of cuticular 
spines. 4. Circular muscles. 5. Cirrus. 6. Cirrus sac. 7. Cuticula. 8. Cuti- 
cula of cirrus. 9. Cuticula of metraterm. 10. Cuticular bristles. 11. Cuticular 
spines of cirrus. 12. Cuticular spines of metraterm. 13. Cylindrical rim of cuticular 
spines. 14. Eggs. 15. Excretory pore. 16. Excretory vesicle. 17. Fold of 
prepharynx. 18. Genital pore. 19. Genital sinus. 20. Intestine. 21. Laurer’s 
canal. 22. Longitudinal muscles. 23. Median yolk duct. 24. Metraterm. 
25. Oesophagus. 26. Oral spines. 27. Oral sucker. 28. Ovary. 29. Oviduct. 
30. Parenchyma cells. 31. Pharynx. 32. Pigment granules. 33. Prepharynx. 
34. Prostate cells. 35. Prostate portion of cirrus sac. 36. Ring disc of cuticular 
spines. 37. Shell glands. 38. Sperm. 39, Subcuticular cells. 40. Testis. 
41. Transverse yolk duct. 42. Uterus (egg-forming portion). 43. Uterus (egg 
storing portion). 44. Vas deferens. 45. Vesicula seminalis. 46. Wall of 
cirrus sac. 47. Yolk glands. 48. Yolk reservoir. 
EXPLANATION OF PLATE XIII. 
Fig. 1. Stephanochasmus casus; dorsal aspect with extended cirrus, x 20. 
Fig. 2. The genital tract; from a contracted specimen, x 40. 
Fig. 3. Cross section of a worm through the Laurer’s canal, x 100. 
Fig. 4. The intestinal epithelium showing a regular arrangement of protoplasmic pro¬ 
jections, x 500. 
Fig. 5. Cross section of the genital sinus, x 300. 
Fig. 6. Cross section of metraterm (24) and cirrus (5) near their proximal end, x 300. 
Fig. 7. Cross section of metraterm (24) and cirrus (5) towards their distal end, that of 
the cirrus being somewhat diagonal, x 300. 
Fig. 8. A single spine from the cirrus. 
Fig. 9. A single spine from the metraterm. 
Fig. 10. Diagram of the genital tract. 
