On Soiitli-Aiiurican Tubiticklie. 205 



the anatomy of the species under tlie heading of Mus maurus, 

 (iray, luis kindly drawn my attention to the fact tliat 

 Mr. Kamsay had ahcady described an Australian " .l/«.s 

 Burtoni^^ *j so that the name of the African one must be 

 changed. 



I would tiierefore suggest for the latter the name of Mus 

 TuUhtrgi, in recognition of Prof. Tullberg's valuable paper on 

 the Muridie of the Cameroons, where this species aj)pear.s to 

 be so common. 



XXII. — Preliminary Notice of South- American Tubificidaj 

 collected hij Dr. Michaelsen, including the Description of a 

 Branchiate Form. By Fkank E. Beddakd, M.A., F.ll.S. 



The Oligochaita of which I give a preliminary account in the 

 following pages were collected by Dr. Michaelsen in South 

 America. The material was, of course, excellently preserved, 

 and I am able therefore to give, I trust, an accurate account 

 of the ])rincipal structural features of the new forms. 



The bulk of the aquatic species which he collected prove to 

 belong to the family Tubificida?, and they are all new species, 

 four of them representing a new and evidently highly charac- 

 teristic South-American genus. So far as I am aware there 

 is nothing known about the aquatic worms of this part of the 

 world, save a few notes on a.n ^olosotna and Naids by Frenzelf 

 in a paper devoted to the Protozoa met with in the Argen- 

 tine, and the description by myself J of two aquatic members 

 of the genus Acaiithodrilus from the Falkland Islands and of 

 a new genus, Kerria, also referable to the Acanthodrilidaj, 

 from the upper reaches of the Pilconiayo River, and, lastly, 

 the description of ^''Mundane atagnalis " by Kinberg, from 

 the same continent, and of one or two forms by Schmarda. 

 The collection contains a few Naids, not sexually mature, and 

 one or two Enchytrjeids. I have not yet subjected these to 

 a careful examination. The Tubiticidaj comprise five species, 

 of which four, as already stated, belong to a new genus, for 

 which 1 proposed the name Jlesperodrilus in a note published 

 in a recent number of ' Nature ' §. The fifth species 1 call 



* Proc. Linn. Soc. N. S. W. (2) ii. p. 553 (1887).^ 



t " Untersuchungen iiber die niikrodkopisclie Fauna Argentinians," 

 Arcli. f. milir. Anat. xxxviii. p. 1. 



J " Contributions to the Anatomy of Earthworms &c.," Quart. Journ. 

 Micr. Sci. xx.x. p. 421 ; and " On ,-ome new Species of Earthworms from 

 various parts of the World," Proc. Zool. Soc. 18'J2. p. H78 &c. 



§ Jan. 25th. 



