A NEW GENUS OF OLIGOOH^TA. 467 



On the Structure of a New Genus of Oligochaeta 

 (Deodrilus), and on the Presence of Anal 

 Nephridia in Acanthodrilus. 



By 



Frank E. Beddard, IH.A.. 



Prosector of the Zoological Society of Londou. 



With Plates XXXIII and XXXIIIa. 



I. On the Structure of a New Genus of Oligochaeta. 



The present paper is based upon the study of only a single 

 example of the worm. It was collected some years ago by 

 Prof. Moseley in Ceylon, and was kindly entrusted to me for 

 description by Prof. W. Hatchett Jackson. 



The specimen measures thirteen inches in length by nearly 

 half an inch in diameter at the broadest part (at the end of 

 the 8th or 9th segment). Its intermediate characters lead 

 me to suggest the generic name Deodrilus; the specific name 

 I propose to associate with Mr. Jackson. 



§ External Characters. 



The prostomium is entirely absent, as it is in some other 

 genera allied to the present. 



The first or peristomial segment is traversed by longitu- 

 dinally running grooves^ which give it a characteristic appear- 

 ance, often seen in worms when there is, as in this genus, no 

 prostomium.^ 



The three following segments are of about equal antero- 

 posterior diameter, though increasing rapidly in their breadth 

 from side to side. 



1 Cf., for example, Beddard (1). 



VOL. XXXI, PART IV. — NEW SEE. I I 



