426 Dr. W. Michaelsen on the Enchytrasidse. 



hohemica. The anteseptale of the second segmental organ 

 was much elongated, and passed anteriorly into the postsep- 

 tale of the first one. The canal traversing the uniting piece 

 showed active vibration. I will also describe another abnor- 

 mity of pretty frequent occurrence. In some animals I found 

 in segment vi., in another in Vil. and viil., and in others 

 again in IX., in the ventral median line, verruciform hypo- 

 dermal growths, which, both in optical longitudinal section 

 and in transverse sections, had exactly the aspect of imperfo- 

 rate penes ; even a central pit-like depression of the cuticle 

 was recognizable. Their not being paired, indeed, was 

 opposed to the notion that these growths were rudimentary 

 penes ; but if it should be proved that this supposition was 

 nevertheless justified, there would be an interesting relation 

 between the abnormal position of the sexual organs in 

 B. appendiculata and these at present enigmatic organs. 



B.fallax lives in rich^, well-manured soil at Steinwarder, 

 near Hamburg, 



Classification of the Enchytrseidse. 



A. Setae sigmoidally curved. 



* Head-pore large, at the apex of the head-lobe or near it. Salivary 

 glands not present. Blood colourless ; dorsal vessel with a cardiac 

 body. Seminal ducts short, not more than eight times the length 



of the seminal funnel Genus Mesenchytr(St(s, Eisen. 



t Head-pore small, between the cephalic ring and the head-lobe. 

 Seminal ducts long. 

 a. No salivary glands. Blood yellow or red. Dorsal vessel vdth no 



cardiac body Genus Pachydrilus, Clap. 



h. Short sahvary glands opening into the oesophagus. The dorsal 

 vessel originates upon an intestinal diverticulum in segment vii. 



Genus Btichholzia, Mich. 



B. Setae straight, with only a slight curvature at the inner extremity. 

 Head-pore small, between the cephalic ring and the head -lobe. Blood 



colourless. Dorsal vessel with no cardiac body. Salivary glands 

 usually strongly developed. Seminal ducts long. 



Genus Enchytrceus, Henle. 



C. Setae aborted. 



Head-pore large, at the apex of the head-lobe. Blood colourless. 

 Dorsal vessel without cardiac body. An unpaired salivary gland 

 lies on the intestine. Seminal ducts long, more or less regularly 

 contorted, like a screw. Seminal sacs large, projecting freely into 

 the body-cavity, not united with the intestine. 



Genus Anachceta, Vejd. 



I may be allowed to add to this systematic summary a few 

 words of explanation. This combination of the two published 

 systems was derived directly from the results of the preceding 

 discussions. It differs very considerably from Vejdovsky's 

 (8) former combination. Vejdovsky places the genus Pachy- 



