1892.] THE LAND-MOLLUSCA OP THE PHILIPPINES. 463 



Gyclophorus acutimarginatus, Sby. (?). Also occurs in Philippines. 



plateni, Dohrn. Peculiar. 



quadrasi. Hid. Peculiar. 



woodianus, Lea. Also occurs in Philippines. 



Leptoponia acuminatum, Shy, „ Philippines. 



alricapillum, Sby. „ Philippines. 



distinguendum, Dohrn. „ Philippines 



insigne, Sby. ,, Philippines. 



luteostoma, Sby. „ Philippines. 



superbum, Dohrn. Peculiar. 



vitreum, Less. Also occurs in Java, Philippines, Moluccas. 



Helicina martensi, Issel. „ Borneo. 



Of the 30 species above enumerated, 1 1 are peculiar to Palawan 

 and the adjacent islands, while, of the remaining 19, 13 occur also 

 in the Philippines only, 3 in Borneo, 2 are common to the Philip- 

 pines and Sunda Islands, while one is assigned, perhaps wrongly, to 

 China. If, however, we take the genera concerned, we find that 3 

 {Cochlostyla, Hemitrichia, Suplecta)Rre Philippine; 6 (^Hemiplecta, 

 Trochonanina, Amphidromus, Eulotella, Opistkoporus, Gyclophorus) 

 are Lido-Malay ; while the remainder are Moluccan and Polynesian 

 genera which have spread into the Philippines and Sunda Islands. 

 Palawan, therefore, affords a link between the Philippines and the 

 Indo-Malay islands, without being very markedly allied with either 

 group. Of Indo-Malay genera which do not appear to reach to the 

 Philippines proper, it has Opistkoporus, while Amphidromus and 

 Eulotella are but scantily represented there. Again, of genera 

 peculiarly Philippine, it has the three above mentioned, so that 

 the balance is fairly even. It is in its operculates, Leptopoma and 

 Gyclophorus, that Palawan shows its closest relation to the Philip- 

 pines. 



The MoUusca known from Busuanga are as follows : — 



Ennea (^Diaphora) mollendorffi. Hid. Peculiar. 



( ) morleti. Hid. Peculiar. 



Kaliella doUolum, Pfr. Also occurs in Philippines. 



Macrochlamys gemma, Vh. ,, Philippines. 



Lamprocystisglaberrima, Semp. ~ 



globulus, MoUf. 



goniogyra, MoUf. 



myops, Semp. & Dhrn. 



Philippines. 

 Philippines. 

 Philippines. 

 PhiHppines. 

 Philippines. 

 Philippines and Borneo. 



Patula aperta (1). 

 Trochomorpha melcalfei, Pfr. 



bintuanensis. Hid. Peculiar. 



crossei, Hid. Peculiar. 



Trochomorphoides (?) fernandezi, Hid. Peculiar. 



planasi. Hid. Peculiar. 



Aulacospira azpeitice. Hid. Peculiar. 

 Trachia malbafensis, Hid. Peculiar. 

 Sadra ^ polychroa, Sby. Palawan and Balabac. 

 '^ As the var. palumba, Sout. 



32* 



