312 



THE MOLUCCAS 



CHAP. 



eastward from India, gain the ascendancy over the Naninidae, 

 the numbers being, Helix 55, 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 Planispira^ 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 Ohhiyia, 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). 

 Amphidromus is not reported on sufficient authority to warrant 

 its insertion in the list. 



Land Mollu 



%ca of the 



, Moluccas. 



(T = Ternate, A = Amboyna i group) 



Helicarion . 



1 A 



Cristigibba 



lA, 4T 



Faunus . . 



1 A 



Euplecta . . 



1 A 



Obbina . 



lA, IT 



Vivipara 



lA 



Xesta . . . 



6A, 4T 



Phania . 



4T 



Acmella . . 



1 A 



Macrochlamys 



lA 



Albersia . 



3T 



Diploinmatina 



4A, 2T 



Lamprocystis 



4A, 2T 



Camaena 



IT 



Kegistoma . 



IT 



Macrocycloides 



4A 



Papuina . 



lA, 7T 



Pupinella . 



1 A 



Sitala . . . 



lA 



Pupa . . 



3A 



Callia . . 



2A 



Kaliella . . 



3 A, IT 



Vertigo . 



2A 



Leptopoma . 



4A, 5T 



Trochomorpha 



3A, 3T 



Clausilia . 



IT 



Lagochilus . 



lA, IT 



Endodonta . 



lA 



Opeas 



4A, 4T 



Ditropis 



3A 



Patula . . 



lA 



Subulina . 



lA 



Cyclotus 



4 A, 6T 



Plectotropis . 



IT 



Tornatellina 



lA 



Omphalotropis 



3A 



Eulota . . 



1 A 



Vaginula 



lA 



Georissa . . 



IT 



Cliloritis . . 



8A 



Melania . 



18A,4T 



Helicina . . 



6A, 3T 



Planispira . 



5 A, 12 T 











((i) 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. 



i 



