77 



the ovary and the receptaculum ovorum. 

 X 00 diam. 



Pig. 21—23. Monilig 'aster sp. from Flores. 



Pig. 21. The ventral portion of a trans- 

 verse section through segment X. x 36 

 diam. 



Fig. 22. A portion of the prostata-glands 

 Highly maguiGed. 



Fig. 23. The lateral portion of a trausverse 

 section through segment XI, to show 

 the funnel-like organ. X 36 diam. 



Fig. 24 — 26. Perichaeta capensis Horst. 



Flg. 24. Prostata. X 5 diam. 



Fig. 25. Spermatheca. X 5 diam. 



Pig. 26. Ventral view of segments XVII 

 and XVIII. X 4 diam. 



Fig. 27. Perichaeta minima n. sp. Sperma- 

 theca. Magnified. 



Fig. 28. Perichaeta sp. from Flores. Sper- 

 matheca. X 16 diam. 



Fig. 29. Perichaeta dubia n. sp. Sperma- 

 theca. x 6 diam. 



Pig. 30. Perichaeta posthuma Vaill. Sper- 

 matheca. X 15 diam. 



Figs. 31 — 32. Megascolex armatus Bedd. 



Fig. 31. Dorsal view of the buccal seg- 

 ment. Magnified. 



Fig. 32. Ventral view of segments 

 XIV— XX. 



Fig. 33. Pontoscolex corethrurus Fr. Müll. 



A sagittal longitudinal section through 

 the anterior body-segments, with protu- 

 ded cephalic extremity. X 16 diam. 



PLATE IV. 



Figs. 34—41. Pontoscolex corethrurus Fr. 



Müll. 

 Fig. 34. Lateral view of the internal organs 



of the cephalic region (buccal segment 



inverted), to show the position of the 



mucous gland and the first three nephri- 



dia. X 5 diam. 

 Fig. 35. Ventral view of the cephalic 



extremity. Magnified. 

 Fig. 36. A seta, to show the crescentic rid- 

 ges near the tip. X 90 diam. 

 Fig. 37. An epidermis-organ of the anterior 



body-region. Highly magnified. 

 Fig. 38. Surface-view of the body-wall of 



the caudal zone, to show the bands of 



bloodvessels. X 20 diam. 

 Fig. 39. A sagittal longitudinal section 



through the caudal zone. X 15 diam. 

 Fig. 40. A longitudinal section through^the 



body-wall of a segment of the caudal 



zone, x 175 diam. 

 Fig. 41. A longitudinal section through the 



body-wall of a segment in front of the 



caudal zone, x 175 diam. 



