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Show 464 REV. A. H. COOKE O N [May 17, Phcenicobius bintuanensis, Hid. Peculiar. campanula, Pfr. Peculiar. Eulotella (l)fodiens, Pfr. Also occurs in Philippines. Cochlostyla l satyrus, Brod. Palawan and Balabac. Cyclophorus smithi, Hid. Peculiar. Coptochilus quadrasi, Hid. Peculiar. It is evident from this list that, as would be expected, Philippine influence is preponderant in Busuanga. Of the 23 species known, 12 are peculiar, and, of the remaining 11, 2 are also peculiar to Palawan and Balabac, 8 are common to the Philippines, and only 1 appears to occur in Borneo. Amphidromus, which occurred in Palawan, is not represented, but relationship with Palawan is sufficiently attested by the one Cochlostyla and by Hadra polychroa. The Indo-Malay Opisthoporus which reached Palawan appears to reach no farther. The occurrence of the Diaphora section of Ennea, which is only found elsewhere in Luzon, is a markedly Philippine element. Kaliella is a thoroughly Indo-Malay genus, which occurs sparingly in Java, Borneo, and the Philippines. The two species classified as Trocho-morphoides are of doubtful generic position. Originally described as Trochomorpha, they were afterwards placed by their author in Geotrochus. In seems better to assign them to the genus in which Von Martens has placed several other Geotrochoid species (e. g. bantamensis, Smith, from Bantam I., off Java, and niahensis, Godw.- Aust., from N. Borneo), until their anatomy has become definitely known. By far the most interesting part of the molluscan fauna of Busuanga are its Helices. Only three are known, viz. campanula, Pfr., bintuanensis, Hid., poly chroa, Sby. These three species belong to two groups closely related to one another. One of these groups is represented in Palawan, the other in Mindoro, Busuanga uniting the two by possessing both. There can be little doubt of the very close relationship of campanula and bintuanensis (together with ceres, Pfr., probably from this same locality) with the species so long regarded as a group of Cochlostyla (Phcenicobius), but now separated off by von Mollendorff as a group of Helices of the Camcena family. The curiously stumpy form, thick and roughly toothed lip, and often wrinkled sculpture are marked points of similarity throughout. The other group, that of polychroa, is more of the normal helicoid type, but is linked with Phcenicobius by the form trailli, Pfr., which presents points of analogy with both groups. This occurrence of a number of large Helices of very restricted distribution (Phcenicobius being peculiar to Busuanga and Mindoro, and the polychroa group to Busuanga, Palawan, Balabac, and perhaps N.E. Borneo) is exceedingly remarkable. The evidence that the polychroa group extends to Borneo is not strong. H. trailli and H. palawanica are given from Borneo in the Brit. Mus. on the authority of Mr. Ussher, Consul at Labuan about 15 years ago. Issel, however, in his monograph of Bornean Mollusca, gives these same species, not from Borneo, but from c Stretto di Palawan,' which probably means 1 As the v&r.fischeri, Hid. |