On the ANATcniY OF (3CNER01)KILUS. 5 



The seccondavi/ lateral and dorsal vessels are neither feathered nor 

 branching; numerous pairs in everj'' segment, but all perigastric. 



The efferent ducts are not grown together, and enter an atrium, 

 which is surrounded at the top by numerous prostate glands. No exte- 

 rior penis. The opening porus of the duets is situated in the 9"' seti- 

 gerous segment. 



The testes are comparatively small, hi 4 pairs: in tlie !)"', the 10"', 

 the 11"' & the 12"" setigerous segments. 



The (widucts are not with certainty found. 



The ovaries are bottleshaped, and situated in the 10"" setigerous 

 segment, and attached to the dissepiment between the 9"' & 10"' segments. 



The receptacles are in 2 pairs, situated behind the efferent ducts 

 in the 10'" & ll'" segments. 



No (/landula alhuminifera. 



From the above generic characteristics it can be clearly seen that 

 the genus Ocnerodrilus takes an entirely isolated place in the family, and 

 the question may even arise if it should not more properly be arranged 

 under a separate family or subfamily. This however, as of lesser impor- 

 tance, will here be left without further consideration, and I will in the 

 following only more minutely describe its organisation and point ciut its 

 mosl characteristic features. 



The alimentary canal differs in many respects greatly from those 

 of the other genera. The mouth and pharynx are, as usually, situated 

 in the buccal- and the first setigerous segments. In the third segment 

 we can trace the commencement of a very muscular oesophagus, conti- 

 nuing as far back as to the 9"' segment. The first five segments of the 

 oesophagus are each surrounded b}^ a pair of very large, lobed glands, 

 similar to those in Enclq/trŒus^ only larger in proportion. The oesopha- 

 gus is in the 7"' setigerous segment furnished with two large lateral, 

 sacklike appendices, of nearly the same structure as the oesophagus it- 

 self. When the animal is alive both sacks are very much elongated and 

 pointing towards the head of the worm, but when the animal is dead 

 and contracted, also they are found to be considerably shortened and 

 with their free, exterior ends pointing towards the ventral jjart of the 

 worm. A similar structure is as far as I am aware, not known to exist 

 in any other Liiaicolide genus and can -therefore be considered as very 

 characteristic of the genus Ocnerodrilus. Both sacks are entirely enclosed 



