450 ME. W. E. DE WIXTON ON A NEW EODENT [May 17, 



exactly coincide with any genus of the Crj^ptodrilidae. It comes 

 nearest to Dichogaster^. This genus was created by Mr. Beddard 

 to include a Fijian worm. Dr. Michaelsen afterwards placed in 

 the same genus some worms that differed in several points and 

 necessitated the definition being altered. Mr. Beddard says = : — 

 "It may be noted also that there is nothing in Michaelsen's 

 description which is opposed to uniting with his two species of 

 Dichogaster my species of Microdrilus'' The definition to include 

 these runs : — 



" Setae paired. Dorsal pores present. Clitellum xiii.-xx. (xxiii.). 

 Male pores on xvii. Two gizzards ; three pairs of calciferous 

 glands. Nephridia diffuse. Spermiducal glands tubular." 



If it were justifiable to alter the definition so as to fit 

 Dr. Michaelsen's worms, surely it might be stretched a little 

 more, viz., in the variable extent of the clitellum, so as to include 

 the present species, which comes nearest to Dr. Michaelsen's, 

 D. mimus^. 



4, On a new Geuus and Species of Rodents of the 

 Family Anomaluridee, from West Africa. By W. E. 

 DE WiNTON, P.Z.S. 



[EeceivedMay 11, 1898.] 



(Plates XXXIV. & XXXV.) 



The British Museum has lately received a collection of mammals 

 from the Benito Eiver in the north of French Congo. Among 

 these is a specimen of a Eodent which is quite new to science. It 

 belongs undoubtedly to the curious family Anomaluridce, but, 

 unlike either of the hitherto described genera which can in any 

 way be compared to it, it has no flying-membranes. IVIr. G. L. 

 Bates has, therefore, materially added to our knowledge of this 

 group, having already obtained the first examples of Idiiints 

 macrotis lately described by Mr. Miller from specimens in the 

 Washington Museum, and examples of Anomalnrus batesi previously 

 described by the present author. 



I have to thank Sir William Flower, Director of the British 

 Museum, for allowing me to work out the mammals obtained by 

 Mr. Bates, and I feel particularly grateful to Mr. Oldfield Thomas 

 for so willingly foregoing his right of describing this fine new 

 form. 



Aethtteus, gen. no v. 



Externally resembling Anomalunts, but without expanded flying- 

 membranes ; with tufts of modified hairs on the ankles. The facial 

 portion of the skull and the proportions of the teeth much resem- 



1 Beddard, Q. J. M. S. vol. xxis. 1889, p. 251. 



2 Beddard. Mon. Olis.. Oxford, 1895, p. 477. 



3 Michaelsen, Arch. f. Nat. 1891, p. 202. 



