12 EISEN 



III. Subfamily 



No setae, only glandular sacs, projecting from the body- wall into the 

 coelomie cavity. The penial bulb consists of numerous glandular cells 

 arranged in a fan-shaped manner (the finer details of this structure 

 are not known) . 



Dorsal vessel rises anterior to clitellum. Unpaired peptonephridia. 

 Head-pore at the apex of the prostomium. Nephridia with a very 

 large anteseptal, not pluri-lobed. No dorsal pores. Blood color- 

 less. Chylus cells in the intestine .................... 4. Achceta Vejd. 



IV. Subfamily LUMBRICILLIN^. 



The single penial bulb contains as a rule no muscular strands, but 

 is covered by a strong investment of muscles, which, however, never 

 penetrate into the bulb. The bulb contains a great number of unicellular 

 glands, which open either on the basal surface of the bulb or into the 

 extension of the duct. The sperm-ducts penetrate the bulb and open 

 in conjunction with the glands. No atrium. No accessory glands. 

 Setae in fascicles of four. Nephridia not pluri-lobed. Head-pore 

 between prostomium and somite I. 



A. Setae always sigmoid and arranged in a fan-shaped manner in the 



fascicle. Dorsal vessel rises posterior to clitellum. No dorsal 

 pores. No cardiac gland. Blood red. Esophagus gradually 

 merging into the intestine. Sperm-sac caps each testis-lobe. No 

 peptonephridia . 



Testes pluri-lobed ................................... 5. Lumbricillus Clap. 



Testes massive and undivided .............. 6. Marionina Michaelsen. 



B. Setae sigmoid or straight. Dorsal vessel rises anterior to cli- 



tellum. No dorsal pores. Blood colorless. Intestine with or 

 without pouches. 



Dorsal vessel without cardiac gland, rises from an anterior dorsal 

 diverticle of the intestine. Esophagus merges suddenly into the 

 intestine. Rudimentary salivary glands. Setae sigmoid. 



7. Bucholzia Michaelsen. 



Dorsal vessel rises anterior to clitellum, but not from a dorsal diver- 

 ticle of the intestine. A cardiac gland. No diverticles of the in- 

 testine. Esophagus gradually merging into the intestine. No 

 peptonephridia. Setae sigmoid ........... 8. Stercutus Michaelsen. 



Dorsal vessel rises in the clitellar somites. Intestine with four 

 diverticles in VIII. No sperm-sacs. No dorsal pores. Nephridia 



