284 THE INFLUENCE OF INANIMATE SURROUNDINGS. 



which he adds the Moluccas and Celebes. But quite irrespective 

 of the question thus raised, which I shall discuss presently, 

 the different portions of this Malayan province exhibit great 

 and extraordinary differences. A greater contrast can hardly 

 be conceived of, than that, for instance, between the fauna of 

 Hong Kong, Amoy, or even Siam, on one side, and Borneo, 

 Java, and Sumatra, on the other. And this difference is 

 repeated in a very striking manner in the Philippines, where the 

 northern district displays an unmistakable harmony with the 

 true Chinese fauna, while the southern islands show a marked 

 resemblance partly to Borneo, partly to Celebes and Gilolo, and 

 partly to the western islands of the Australian region. 



FIG. 73. Shells of Molluscs from the Philippines. , Coehlostyla stabilis, Sow. ; b, Chlorcea 

 11. sp. ; c, CMoraM bengutlensis, S. ; d, Ccchlcstyla mcigtanensis, S. 



As these remarkable facts are probably not universally 

 known, I will here give rather fuller details as to the more im- 

 portant of them. 



The most prominent feature of the fauna of the Philippines is 

 beyond a doubt its terrestrial mollusca. 108 Setting aside the 

 minuter forms for the present, the following five genera are 

 those which give this fauna its peculiar character : Coehlostyla, 

 (see fig. 73, a and <7), Obbina, C Moreno, , ffelicarion, and Rhysota. 

 They are here extremely rich in species, while on the adjacent 

 islands, not belonging to the Philippine group, only a few quite 



