ENCHYTR^ID^ ip 



2. Spermatheca with an olive-shaped diverticle near the intestinal end. En- 



larged lateral seta; in V to VII. Head-pore close to anterior margin of 

 prostoinium. IJrain slightly emarginated posteriorly. Sperm-sac short, 

 confined to XII. Clitellum j XI to j XIV. Glands around the penial 

 bulb 9. M. setosus Michaelsen, '88. 



3. Dorsal setae in IV to VI twice as long as the others (i or 2 in each somite). 



Spermatheca.'' 10. M. armatus Lev, '84. 



4. Spermatheca with a small pear-shaped diverticle at the center. No enlarged 



setffi. Sperm-sacs large, extending back many somites. Head-pore half 

 way between somite I and apex of prostomium. Lateral setae 2, ven- 

 trals mostly 4. Sperm-ducts long. P'unnels long. 



II. M. asiaticus sp. nov. 



5. Sperm-ducts short and thick, about five times longer than funnel. Setae, 



ventral : 5 to 12, dorsal : 2 to 3, those in V, VI, VII, in dorsal fascicles 

 larger. Spermatheca with one (.') diverticle. Brain posteriorly emargi- 

 nated 12. M. mcgachcEtus Bretscher. 



III. Spermatheca with two diverticles. 



A. SpermathecEB unusually enlarged, extending through several somites pos- 



terior to V. 



1. Spermathecffi not connected with the intestine. Penial glands, about I2 



long atrial glands ; no accessory glands. Brain square or broader than 

 long 13. M. harrimani %i^. nov. 



2. Spermathecae not connected with the intestine. About five atrial glands ; 



penial glands ; no accessory glands. Brain rounded. 



14. M. sefckelli s^. nov. 



3. Spermathecae not connected with the intestine. About ten atrial glands ; 



penial glands ; one large accessory gland. Brain almost square. 



15. AI. franciscanus sp. nov. 



4. Spermathecae not connected with the intestine. About fourteen atrial 



glands opening into the atrium in different planes ; penial glands ; no 

 accessory glands. Brain broader than long, slightly emarginated pos- 

 teriorly 16. M. obscurus sp. nov. 



5. Spermathecae connected with the intestine. About twelve atrial glands; 



penial glands; no accessory glands. Brain broader than long, pos- 

 teriorly emarginated 17, M. vcffce sp. nov. 



6. Spermathecae not connected with the intestine. Several atrial glands ; 



no penial glands and no accessory glands. Brain longer than broad 

 with a slight emargination 18. M. o rccz sp. nov. 



7. Spermathecae not connected with the intestine. At least 12 atrial glands 



opening in pockets between the epithelial cells ; many penial glands ; 

 no accessory glands. Brain deltoid, with slight posterior emargination. 



19. Af. maculatus sp. nov. 



B. Spermathecse not enlarged and not extending posteriorly beyond somite V. 



a. No atrial, penial, and accessory glands contiected -with lo-wer end of 



sperm-ducis. 

 Brain posteriorly convex. Diverticles as long as the ampulla of the sper- 

 matheca, and much longer than the duct leading to the pore. 



20. M. ktncaidi sp. nov. 



b. Atrial and feiiial glands present in connection -with the sperm-ducts but no 



accessory glands at the male-pores. 



1. Spermatheca short and thick ; diverticles have the form of shallow out- 



bulgings of the spermathecal wall. Four atrial glands. 



21. M. penicillus sp. nov. 



2. Diverticles longer than the ampulla of spermatheca. Brain poste- 



riorly slightly emarginated. About 8 long atrial glands. Lympho- 

 cytes round. Length about 17.9 mm 22. M. grandis sp. nov 



