578 MR. F. E. BEDDARD ON NEW [DeC. 20, 



The gizzard lies in segments v. and vi., but only one-fourth of the 

 organ lies in the anterior segment. Calciferous glands are, as in 

 A. annectens, totally absent ; the intestine begins in the twentieth 

 segment. Some of the septa are thickened. 



There is a mucous gland, and the nephridia are paired. 



The gonads are normal in position ; they are not situated on the 

 posterior face of their segments as is the case with A. annectens. 

 Opposite to them are the funnels of the ducts, which are like those 

 of other species and occupy the same segments. The sperm-ducts, 

 however, agree with those of A. annectens to differ from those of 

 most other Earthworms, in running within the thickness of the body- 

 wall ; they retain their individuality until just before the external 

 aperture. 



The atria have no peculiarities of structure ; there are no penial 

 set£e ; strong muscular bands run from the lateral to the ventral 

 parietes in the neighbourhood of the atria, a character which unites 

 this species and Acantliodrilus annectens to the genus Octocheetus : 

 the presence of these muscular strands is perhaps to make up for 

 the absence of penial setse ; the atrial papillae can possibly be 

 considerably protruded by their means, and as they (the extruded 

 papillae) are tapered at the extremity, they can, it is likely, be actually 

 inserted in the spermatothecal orifice and convey the sperm direct. 



The oviducal pores are placed just in front of the ventralmost setse. 



The oviducts have no egg-sacs attached to them. 



The sperm-sacs are in segments ix., xi,, xii. ; I could not find 

 any sac in the intervening segment. 



The spermatothecse are, as in all the Acanthodrilidse (excepting 

 only A. communis), two pairs and lie in the usual segments, i.e. viii., 

 ix. ; each pouch has, as in Acanthodrilus annectens, more than one 

 diverticulum ; in the present species there are two, one of which is 

 rather the larger. 



Closely allied to Acanthodrilus annectens as this species un- 

 doubtedly is, there will be no difficulty in distinguishing it. The 

 chief points of difi'erence are : — (1) position of gizzard ; (2) normal 

 position of gonads ; (3) form of spermalothecse. 



5. Acanthodrilus falclandicus, n. sp. 



Some time since I added ^ some anatomical details to Michaelsen's 

 account of Acanthodrilus georgianus'^, which had been derived from 

 the study of what I believed to be an identical form. More re- 

 cently Michaelsen^ gave reasons for regarding the species described 

 by myself as not identical with that named by him Acanthodrilus 

 georgianus. Dr. Michaelsen has been so good as to send me two 

 specimens of his A. georgianus, and I have therefore been able to 

 follow the account which he has given regarding the species. 



^ " Contributions to the Anatomy of Earthworms, with descriptions of some 

 new Species," Q. J. M. S. vol. xxx. p. 421. 



^ " Die Oligochaeten von Sixd-Georgien &c.," JB. Hamb, wiss. Anst., Bd. v. 

 p. 68. 



^ " Oligochaeten des Hamburger naturhistorischen Museums, iii.," JB. Hamb. 

 wiss. Ansli. vii, p. 7. 



