ENCHYTR^ID^ I9 



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



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

 prostomium. Brain slightly emarginated posteriorly. Sperm-sac short, 

 confined to XII. Clitellum ^ XI to :| 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. armaius'L.cy, '84. 



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



setie. 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. Funnels long. 



i\. M. asiaticus sp. nov. 



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



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. 7negacAcetus Bretscher. 



III. Spermatheca with two diverticles. 



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



terior to V. 



1. Spermathecte not connected with the intestine. Penial glands, about 12 



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

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



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



penial glands ; no accessory glands. Brain rounded. 



14. AI. setchclli s^. nov. 



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



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



15. AI. franciscaiius 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 i6. 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. AI. vegce s^. 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. orc(B s^. 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. AI. maculatus sp. nov. 



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



a. No atrial, -penial, and accessory glatids cou7iccted ivith loxver end of 

 sperm-ducts. 

 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. iincaidi sp. nov. 

 i. Atrial and fe7iial glands present in connection xvith 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 spermatheca! wall. Four atrial glands. 



21. At. 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. AI. grandis sp. nov 



