458 WILHELM MICHAELSEN. 



indistinct or absent. Two pairs of sperm-sacs in tlie 

 eleventh and twelfth segments. No spermathecEe. 



Helodrilus constrictus (Rosa) 



EXPLANATION OF PLATE XXXII, 



Illustrating Professor W. Michaelsen's paper, " The Oligo- 

 chteta of Natal and Zululand." 



Fig. 1. — X 100. Chilota warreni n. sp. Distal end of a penial 

 seta of the first form. 



Fig. 2. — x 100. Chilota warreni n. sp. Distal end of a penial 

 seta of the second form. 



Fig. 3. — X 100. Chilota brannsi Mich. Distal end of a penial 

 seta. 



Fig. 4. — X 1000. Chilota trag^rdhi Mich. var. major n. var. 

 Distal end of a penial seta. 



Fig. 5. — X 100. Chilota tragfirdhi Mich. var. major ?i. var. 

 Distal half of a penial seta. 



Fig. 6. — x 1000. Dichogaster crawi Eisen. Part of a penial 

 seta. 



Fig. 7. — x 30. Dichogaster crawi Eisen. Spermatheca. 



Fig. 8. — X 100. Microcha3tiis natalensis (Kinh.). Distal end 

 of a sexual seta. 



Fig. 9. — x 1"5. Microchsetus natalensis {Kinh.). Clitellar 

 region from the ventral side. 



Fig. 10. — X 1000. Microcheetus papillatus Benli. f. typicus. 

 Distal end of a sexual seta. 



Fig. 11. — X llOOO. Microchsetus papillatus jBe/;/;. var. csemen- 

 terii n. var. Distal end of a sexual seta. 



Fig. 12. — x 100. Microchajtus parvus «. s^:). Sexual seta. 



Fig. 13. — x 3'5. Microchffitus sulcatus (Kinh.) var. howicki- 

 anus n. var. Clitellar region from the ventral side. 



Fig. 14. — X 3"5. Microchajtus sulcatus (Kinb.) var. howicki- 

 anus n. var. The clitellar region from the ventral surface of another 

 individual. 



Fig. 15. — x 100. Microchastus sxilcsitws (Kinb.) var. howicki- 

 anus n. var. Sexual seta. 



