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Show 1892.] THE LAND-MOLLUSCA OF THE PHILIPPINES. 467 but he does not figure any) I am quite unable to suggest. If an Amphidromus, the balance of connection would be, on the whole, with Formosa. The further investigation of the Mollusca of this interesting group is very desirable. In the following table (pp. 468, 469) are examples of Indo-Ma-layan genera which reach the Philippines. The following Indo-Malayan genera occur in the Philippines, but have not yet been detected in Sumatra, Java, or Borneo, viz.:- Hypselostoma (philippinicum), Plectopylis (polyptychia, trocho-spira), Ditropis (mira, cebuana, quadrasi), Cyathopoma (cornu, meridionale, aries). Of Moluccan and Polynesian genera occurring in the Philippines, and gradually diminishing through the Sunda Islands westward, the following may be mentioned :-Trochomorpha : Philippines 9, Borneo 8, Java 8, Sumatra 4 ; Helicina: Philippines 16, Borneo1 3, Java 1, Sumatra 0; Leptopoma: Philippines 31, Borneo 11, Java 2, Sumatra 1 ; Cyclotus: Philippines 18,Borneo 6, Java 2, Sumatra 1 ; Pupina : Philippines 5, Borneo 3, Java 5, Sumatra 3. Two species of Tornatellina (manillensis, ringens) occur in the Philippines, but not farther westward, one of Endodonta (philippinensis), and one of the Leucochilus section of Pupa (the pan-Polynesian pediculus). There seems to be a good deal of misunderstanding with regard to the island Tukan Bessi (variously spelled Toekang Besi, Toukang basi, Tukang Bessie, Toekun Bessi). It originally came into notice as the habitat of three supposed Cochlostylce (thomsoni, Pfr., indusiata, Pfr., tukanensis, Pfr.), described (as Helices) by Pfeiffer in Malak. Blatt. xviii. 1871, p. 120, f., from the collection of Mr. J. H . Thomson ; the same locality is repeated in each case in the ' Novitates,' vol.iv. pp. 71-73. Robert, in his papers on geographical distribution, quotes Issel (Monogr. Bornean Mollusca) as referring one of these species to "the small islands north of Borneo," and in his list gives Cochlostyla lais, tukanensis, and physalis all from " Toekun Bessi." Von Mollendorff (Jahrb. deutsch. malak. Gesell. xiv. p. 285) remarks that this island, as well as Tular and New Beland, lies between the S. point of Mindanao and the Moluccas. The only Tukan Bessi with which I am acquainted is off the S.E. point of Celebes, in Lat. 4° S., Long. 124° E., and therefore well away from the Sulu Sea or the Celebes Sea proper. No island of such a name, or of a name anything approaching it, appears on the chart of the seas north of Borneo. Either, therefore, the original locality of Mr. Thomson's shells was incorre'ct, which there seems no reason to believe, or the island has been wrongly located by succeeding writers. What the island of " N e w Beland" is, to which Mollendorff refers, and from which Von Martens describes 2 his Cyclotus angulatus, I am quite unable to conjecture. 1 Lieut.-Col. Godwin-Austen (P. Z. S. 1889, p. 352) adds crossei, Semp., to the Bornean fauna, on the authority of the Brit. Mus., which has specimens from " Palawan." I suspect this is an error. Semper's original locality was Palauan in Luzon. 2 Jahrb. deutsch. malak. Gesell. i. 1874, p. 56. |