IN THE LEYDEN MUSEUM. 89 



tain another hypothesis — it is indisputable that the longer 

 they have been isolated by natural barriers, f. i. by broad 

 and deep waters, the greater chance we have to find the 

 differences of the several groups more constant and more 

 fixed , and therefore the species more circumscribed. And 

 in this respect the large islands of Sumatra, Java, Borneo, 

 Celebes and New-Guinea with the surrounding smaller is- 

 lands are in the best and most favorable condition. And 

 indeed no other part of the world is so rich in Pigs and 

 in no other part of the world the area of distribution is 

 more circumscribed for each species, so that about each 

 large island here has its own distinct Pig. 



I will try to give in the following pages an idea of the 

 geographical distribution of the Pigs in the named Archi- 

 pelago, especially based upon the collections in the Ley- 

 den Museum , where are stored up larger and more com- 

 plete series of Pigs than in any other Museum. 



Sus vittatus S. Muller. 



a, 5. Adult females, stuffed, types of the species. Suma- 

 tra. Collected by S. Muller, 1836. 



c. Adult male , stuffed , one of the types of the spe- 

 cies , figured in » Verhandelingen" *), pi. 29. Suma- 

 tra, Padang. Collected by S. Muller, 1836. 



d. Young male, stuffed, one of the types of the spe- 

 cies. Padang. Collected by S. Muller, 1836. 



e, f. Adult specimens, stuffed. Java. Collected by Kuhl 

 and van Hasselt. 



des races locales on espèces secondaires issues d'une souche commune plutot 

 que. des es])èces proprement dites, mais pour resoudre la question, il faudrait 

 pouvoir comparer la tête osseuse et les autres parties du squelette chez un 

 grand nombre d-individus appartenant ïi chacune de ces variéte's, afin de deter- 

 miner Ie degré de fixité des caractères employés par les zoologistes pour les 

 distinguer entre elles; et ces objets d'étude manquent dans nos Musées euro- 

 pe'ens." Cf. also de Blainville „Oste'ographie, 1839—64, T. IV, p. 131". 



1) Verhandelingen oyer de Natuurlijke Geschiedenis der Nederlandsche over- 

 zeesche bezittingen. Zoölogie, 1839 — 1844. 



Notes from the Leyden IMuseum, Vol. XIII. 



