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Show 1892.] THE LAND-MOLLUSCA OF THE PHILIPPINES. 463 Cyclophorus acutimarginatus, Sby. (?). Also occurs in Philippines. plateni, Dohrn. Peculiar. quadrasi, Hid. Peculiar. woodianus, Lea. Also occurs in Philippines. Leptopoma acuminatum, Sby. ,, Philippines. atrieapillum, 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, 11 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 Philippines and Sunda Islands, while one is assigned, perhaps wrongly, to China. If, however, we take the genera concerned, we find that 3 (Cochlostyla, Hemitrichia, Euplecta) are Philippine; 6 (Hemiplecta, Trochonanina, Amphidromus, Eulotella, Opisthoporus, Cyclophorus) are Indo-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 Opisthoporus, 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 Cyclophorus, that Palawan shows its closest relation to the Philippines. The Mollusca known from Busuanga are as follows :- Ennea (Diaphora) mollendorff, Hid. Peculiar. ( ) morleti, Hid. Peculiar. Kaliella doliolum, Pfr. Also occurs in Philippines. Macrochlamys gemma, Ph. „ Philippines. Lamprocystisylaberrima, Semp. „ Philippines. globulus, Mollf. „ Philippines. goniogyra, Mollf. „ Philippines. myops, Semp. & Dhrn. ,, Philippines. Patula aperta (1). „ Philippines. Trochomorpha metcalfei, Pfr. „ Philippines and Borneo. bintuanensis, Hid. Peculiar. crossei, Hid. Peculiar. Trochomorphoides (?) fernandezi, Hid. Peculiar. planasi, Hid. Peculiar. Aulacospira azpeitice, Hid. Peculiar. Trachia malbatensis, Hid. Peculiar. Hadra l polychroa, Sby. Palawan and Balabac. 1 As the var. palumba, Souv. 32* |