The Cambridge natural history . Fig. 2\0.—Coehlostyla (Chrij-salis) mindorocnsis Brod.,Mindoro, Philippines. Fig. 2\l.—Coehlostyla {Ortho-stylus) Fortei Reeve, Luzon. different islands of the Philippine group affords importantevidence on the geological relation of the islands to one we find and Hypselostyla occurring in thecentral islands and S. Luzon, but not in Mindanao or Mindoro ;we find Chrysalis peculiar to Mindoro, Frochilns to Mindoroand the Cuyos, Ptychostyla to Luban, all these being sub-generaof very marked characteristics. Six out of the fifteen sub-genera
The Cambridge natural history . Fig. 2\0.—Coehlostyla (Chrij-salis) mindorocnsis Brod.,Mindoro, Philippines. Fig. 2\l.—Coehlostyla {Ortho-stylus) Fortei Reeve, Luzon. different islands of the Philippine group affords importantevidence on the geological relation of the islands to one we find and Hypselostyla occurring in thecentral islands and S. Luzon, but not in Mindanao or Mindoro ;we find Chrysalis peculiar to Mindoro, Frochilns to Mindoroand the Cuyos, Ptychostyla to Luban, all these being sub-generaof very marked characteristics. Six out of the fifteen sub-generaare entirely absent from Mindanao, altliougli occurring on theislands in the immediate vicinity. The little group Tal)las-Romblon-Sibuyan are entirely deficient in certain sub-generawhich occur (jn the islands surroundins; them on all sides.^ ^ A. 11. Cooko, P. Z. S. 1892, pp. 447-169. 314 THE PHILIPPINES. Fig. 212.—Helix (Obbina) rota Brod.,Pliilipjiines. Other forms peculiar to the Philippines are Diaplwra, a section of Ennea with a curi-ously produced mouth, andseveral sub-genera of the^ Naninidae(F*^?imco7iws, Vit-rinoidea, Hemitrichia). Thegreat Mhysota here find theirmetropolis. Another verymarked group of Helix isOhhina, 19 of the 25 knownspecies being Helicidae proper of the Philippines are still held incheck, as in the greater part of the Indian region, by theNaninidae. The single Irachia and Plectotropis, and the 2species each of Plectopylis and Satsuma, indicate aftinities withIndo-China. Further important Indian relationships are seenin the great Nanina and Cyelo-pliorus, which here attain almostIndian dimensions; in Kaliella (8 sp.), Sitala (2), Clausilia(1). Among the operculates we still have 1 Alycaeus and 1Coptochilus. Singularly enough, several Indian genera whichoccur here are not found in the intervening islands of Borneo,Sumatra, or Java, Strepta
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
