538 Mr. O. Thomas on 



Tin's interesting specimen is one of the remains of Capt. 

 Sturt's famous expedition of 1844-45 into Central Australia. 

 Rats of tills genus are frequently mentioned in the course of 

 his ' Narrative,' and were said to be then excessively common. 

 But I have not been able to find any reference which can be 

 certainly assigned to this particular animal. 



The species is readily recognizable by its long tail and 

 other resemblances to xV. lonyicaudatus, combined with its 

 markedly smaller size. 



"A rat like a diminutive kangaroo, called Talamba by the 

 natives." — C. Start. 



3. Notomys gouldi, Gould. 



The synonymy of this species almost defies elucidation, 

 owing to Gould's misdeterminations, to Gray's publication of 

 names without descriptions, and to the belated publication 

 of the plates of the 'Erebus' and 'Terror' in 1875, though 

 they were quoted by other authors far earlier. Tlie following 

 appears to be an approximation to the trutii : — 



Hapalotis gouldi. Gray, Grey's Journ. ii., Appendix, p. 404 (1841) 

 (iiomeii nudum). 



Id. List Mamm. B.M. p. 116 (1843) (nom. nud.). 

 Hnpalotis mitchelli, Gould, Mamm. Austr. iii. pi ix. (1845), \V. Aus- 

 tralia ; nee Dii>Hs mitchelli, Og. Specimen B.M. no. 7. 1. 1. 135 

 received with the Tomes Collection. 

 Hapalotis yoiddl, Gould, P. Z. S. 1851, p. 127 (nom. nud.). 



Id. Mamm Austr. iii.. Introduction, p. xxxv (1863). " H. gouldi 

 of Gray will be the correct designation of the animal I have 

 called //. mitchelli.'" 

 Hapalotis richardsoni, Gray, Voy. ' Erebus ' and ' Terror,' Mammals, 

 p. V2d, pi. xxviii. fig. 2 (1875). Swan River. Type, B.M. 

 no. 43. 8. 21. 3. 

 Notomys gouldi, Thos. P. Z. S. 1906, p. 767. 



Hah. Western Australia (Salt il., Dvvaladine, Stockpool, 

 Albany). 



Type. B.M. no. 7. 1. 1. 135. 



Size rather small ; hind foot about 3G mm. ; skull attaining 

 32"5 mm. in greatest length. Palatal foramina and choana> 

 narrow. 



The common West-Australian species, found in some 

 numbers there by Shortridge in 1906. 



4. JSotomys macrotis, sp. n. 



Hapalotis macrotis, Gerrard, Cat. Bones Mamm. B.M. p. 171 (1862) 

 (nom. nud.) ; Gould, Mamm. Austr. i., Introd. p. xxxv (1863) (nom. 

 nud.). 



Very similar to N. gouldi, but larger, the hind foot about 



