various Soidh-Ainericdii ^famnnl[s. 353 



Moasuiements of five skulls of the two Sj)ecies (two oF 

 these kindly placed at ray disposal by the authorities of the 

 Ko)al College of iSurgeons) : — 



I}usici/on antarcticus, D. daricini. 



K.C.S. B.M. B.M. B.M. R.C.S. 



C35. 69.2.24.3. 37.3.15.48. 37.3.15.47. 636. 



(Type.) 



Greatest length 16G 164 158 181 175 



Condvlo-basal lenprtli 164 162 155-5 (c.) 177 171 



Zygomatic breadtli 94 91 87 98 



LenfTthof nasiil!s(middleliiie). 53 67 51 .. 55 



Int.rorbital breadth 30 285 27 36 33-5 



Breadth of brain-case 52 2 61-5 51 54 53 



Bivadth of muzzle 28 29 28 35 31 



Palatal length 86 85-6 83 95 91 



]..n{.th of ;r' 11-2 11 103 11-7 11 



Length of ;>^ 17-2 18 17-5 18-5 20 



Length of wi'aud7«=combmed. 17-3 17-5 18 19-8 20 

 C! reatest diameter of extracted 



canine 9-7 95 8-5 107 99 



JJah. East Falkland Island. 



Ttipe. Adult male. B.M. no. 37. 3. 15. 47. Collected 

 during the voyages of the 'Adventure' and 'Beagle,' and 

 presented by Sir W. Burnett and Admiral Fitzroy. 



It is a matter of extreme interest to find that there are two 

 distinct insular forms of the !iow extinct '' Antarctic Wolf," 

 iniiabiting respectively the East and West Falkland Islands. 



First, may be quoted Darwin's account, published in the 

 ZoMJogyofthe "Voyage of the 'Beagle'" ("Mammalia," 

 jj. 10), which already indicated this distinction as lono- aoo 

 as 1838 : — " I was assured by Mr. Low, an intelligent sealer, 

 who has long frequented these islands, that the wolves of 

 West Falkland are invariably smaller and of a redder colour 

 than those from the Eastern island ; and tliis account was 

 corroborated by the officers of the ' Adventure,' employed in 

 surveying the archipelago." 



[Tliis asserted difference is explained in Mr. Rupert 

 Vallentin's interesting account of the Falkland fauna f as 

 being due to age ; but, as no question of age comes in in the 

 distinction of the skulls — all being fully adult, — we may con- 

 clude that the opinion given by Mr. Vallentin's informant 

 was mistaken.] 



* Sex-marks placed in brackets indicate that tlie.'^e arc presumed from 

 the size of the canines. A male canine is appro.xim.ntely a millimetre 

 more in diameter than a female one, the measurements Ijeing taken at 

 the thickest part of the tooth, when extracted from the skull. 



t Mem. Manchester 8oc. xlviii. men). 2.'i, p. 45 (1904). 



