Mr. T. R. H. Thomson on a new species of Genetta. 203 



h, with small ant-orbital opening. 



* with rootless molars -^t Aplodontia. 



[Aberrant forms of Sciuridce ?] 

 ** with rootless molars -^4. 



1. Folds of enamerto the molars simple Ascomys. 



2. -^. nnmnlinatpd... Cnsfnr. 



4-4 



melH 

 2. ^V- complicated Castor. 



Family 2. Myoxid^e. Genera : Myotys, Eliomys, Muscardinus, and Gra- 

 phiurus. \ 



P'amily 3. DiPODiD.Ef. Genera : Dipus, Alactaga, and Meriones. 



Family 4. Muridj=:. Genera : Gerbillus, Psammomys, Mus, Hesperomys, 



Dendromys, Phl&omys, Cricetomys, Cricetus, Euryotis, Hapalotis, Reith- 



rodon, Sigmodon, and Neotoma. 



Subfamily 1. Aspalomyina. Genera : Rkizomys, Aspalomys, and Heteroce- 



phalus. 

 Subfamily 2. Arvicolina. Genera : Ondatra, Arvicola, and Lemmus. 



[To be continued.] ^JL^^'kU 



XXXIII. — Description of a new species of Genetta, and of 

 two species of Birds from Western Africa. By T. R. H. 

 Thomson, Esq., R.N., Surgeon of the late African Expe- 

 dition. 



Among the various specimens of natural productions which 

 I collected during the late expedition is a new species of Ge- 

 netta, differing very remarkably in colouring from the other 

 species of this African genus. I received it from the Bobys 

 or natives of the island, and they had skinned it through the 

 mouth without making any other incision in the skin. 



I have taken the opportunity of naming the Genetta after 

 my friend Dr. John Richardson, the Inspector of the Naval 

 Hospital at Haslar, so well known for his highly scientific ac- 

 quirements, and so much esteemed in the naval service by all 

 his medical brethren. 



I may mention, from its being interesting as showing the 

 wide geographic range of the animal, that I have brought home 

 with me a large kind of cuff or arm-shield formed of the skin 

 of Colobus Guereza of Riippell, which has hitherto only been 

 found in Abyssinia, where, according to Peirce, as quoted in 

 the ' Synopsis of the Contents of the British Museum/ the 

 skin is used for the same purpose. The cuff, which consists 

 of the greater part of the back with the white stripe, differs 

 from Dr. Ruppelr's specimen of the animal in the British 



f To attain uniformity of system, — taking the name of the family from 

 one of the principal genera it contains, — 1 have thought it desirable to sub- 

 stitute the name Dipodida for Gerboidee. 



