ON THE ANATOMICAL STRUCTURES OF TWO 

 SPECIES OF KERRIA. 



BY GUSTAV EISEN. 



While my late paper on new species of Ocnero- 

 drilus* was passing through the press I found that a 

 tube which I had supposed to contain specimens of 

 Ocnerodrilus Beddardi , really housed an entirely differ- 

 ent form. It was too late to add anything to my previous 

 paper, and I had to reserve detailed account to a later 

 date. A closer examination of this oligocheetous worm 

 proved that not only had I before me a new species, but 

 a different genus of unusual interest especially at this 

 time when our knowledge of the systematic arrangement 

 of the oligochteta is constantl}- increased by finding ex- 

 treme as well as intermediate forms. 



The MS. describing these worms as a new genus was 

 already in print, when I received Beddard's paper on 

 Kerria, a new genus, intermediate between Acanthodrilus 

 and Ocnerodrilus. I recognized at once that my new 

 forms did not differ sufficiently to warrant a new genus 

 to be formed. The genus Kerria was founded by 

 Beddard on a worm from Pilcomayo, the genus is there- 

 for an American one, and we may expect to find it to 

 contain as many species as Ocnerodrilus. 



The discovery of this form was quite unexpected. 

 The locality where found is the so-called Cape Region 

 of Baja California, the extreme southern part of the 

 peninsula, not very far from San Jose del Cabo. The 

 exact locality is a swampy or rather shallow pond, sur- 

 rounded by tall palm trees { Pritchardia Sonorce), situ- 

 ated immediatel}' south of the village Miraflores on the 

 road to San Jose del Cabo, in the very outskirts of that 



* ante, p. 228. 

 2d Seb., Vol. III. April l.->, 18'.W. 



