312 



THE MOLUCCAS 



CHAP. 



eastward from India, gain the ascendancy over the Naninidae, 

 the numbers being, Helix 35, Nanina 36. If we take the groups 

 separately, we find that in the Amboyna group the proportion is 

 22 to 23, while in the Ternate group it is 33 to 13, an addi- 

 tional proof that the Amboyna group is far less Papuan than the 

 Ternate. Of Plaiiispira, the most characteristic sub-genus of 

 Helix, there are 12 species in the Ternate group, and 5 in the 

 Amboyna. The section Phania, which contains 4 species of the 

 finest Helices known, is quite peculiar to the Ternate group. 

 One species of Ohhina, a sub-genus markedly Philippine, occurs 

 in each group. Several of the Indo-Malay land operculates 

 (e.g. Ditropis') reach their limit here, and here too we have the 

 last Clausilia (strangely absent from the Amboyna group). 

 Aynphidromus is not reported on sufficient authority to wariant 

 its insertion in the list. 



Land Mollusca of the Moluccas. (T = Ternate, A = Amboyna i group) 



(d~) The Philippine Province. — In the extraordinarily rich 

 development of their Mollusca, the Philippines form a remark- 

 able contrast with the poverty of the adjacent Malay islands. 

 No less than 727 species of land Mollusca alone are known from 

 the group, amongst which are included some of the finest and 

 handsomest forms yet discovered. The main features of the 

 fauna are Indo-Malay, with the addition of a certain Australa- 



1 The Amboyna group has been much the better explored. Common to both 

 groups are one sp. each of Kaliella, Trochomorpha^ Opeas, Leptopoma, Cyclotus, 

 Helicina. 



