The Cambridge natural history . ), and Rapliaidus. The occurrenceof a single Papuina (Moluccas eastward) isvery remarkable. Amphidromus is a genus characteristicof the great Sunda Islands, attaining itsmaximum in Java (12 sp.). The Indian Glessula still hasone species each in Sumatra, Java, and Borneo. One speciesof Streptaxis ^ occurs in Malacca, but Ennea (3 sp.) reaches asfar east as Borneo and the Philippines. Parmarion, Helicarion,Ariophanta, and other groups of the Naninidae are well repre- Strcidaxis is a remarkable instance of a mainland genus. Although abundantin the Oriental, Ethiopi
The Cambridge natural history . ), and Rapliaidus. The occurrenceof a single Papuina (Moluccas eastward) isvery remarkable. Amphidromus is a genus characteristicof the great Sunda Islands, attaining itsmaximum in Java (12 sp.). The Indian Glessula still hasone species each in Sumatra, Java, and Borneo. One speciesof Streptaxis ^ occurs in Malacca, but Ennea (3 sp.) reaches asfar east as Borneo and the Philippines. Parmarion, Helicarion,Ariophanta, and other groups of the Naninidae are well repre- Strcidaxis is a remarkable instance of a mainland genus. Although abundantin the Oriental, Ethiopian, and Neotropical regions, it never seems to occur on anyof the adjacent islands, except in the case of Trinidad (1 sp.), which is practicallymainland. Omphalotropis, on the other hand, is the exact reverse of Streptaxisin this respect, occurring all over Polynesia and the Malay Is., as far west as Borneo,as well as on the Mascarenes, but never, save in a doubtful case from China, on themainland of Asia, Australia, or Fig. 208.—A, OpistliostomaCookei E. A. Smith,Borneo ; B, Opistlio-stoma , Borneo. Bothx8. 3 IO CELEBES CHAP. sented. Hemiplecta and Xcsta aie abundant and large, while theBliysota of Borneo contain some huge sinis-tral forms. lihodina is a remarkable formfrom Malacca, whose exact generic positionis not yet settled. Clausilia has a few specieson all tlie islands, the last occurring onTernate, and a single Pcqniina (Moluccasand X. Guinea) occurs in Borneo. The Island of Celebes marks the lie-ginning of a distinct decrease in the Indo-Malay element. The Naninidae lose ground,in proportion to the Helicidae, Macro- cTtla/inys, for instance, l)eing represented hjFig. 209.—Amphidromus -, . i rr ? i j -i n perversus Java. ^11^7 ^^^^ species, and Hcmiinccta by lour. Other characteristic genera of the Indian region dwindle, such as AvvpliidTomus, Clausilia, the tubed operculates, and Cyclopliorus, Avhile SitaJa, Kaliella, Glessula, an
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
