OCR Text |
Show 166 Mil. HARPER PRASE ON POLYNESIAN LAND-SHELLS. [May 2, The following species, credited to Polynesia, I exclude from the catalogue, viz. :- II. crassilabris, Phil., does not inhabit the Sandwich Islands. II. bicolor, Pfr., is credited to Tahiti, which is without much doubt an error, as no species of its size inhabits Polynesia except H. maugerice, Gray, from which, or any of its varieties, it differs widely. HELICINA MAUGERIA, Gray. The type of this species is a thick solid shell, rather bluntly angulate at the periphery, and may always be recognized by the colour of its basal callosity, bright yellow, which is persistent; the basal callosity of the variety H. rubicunda, Pse., is equally persistent, of a dark red. On both the callosity is very thick. At the same locality a form occurs which I consider a variety of the above, although it differs rather widely in most of its characters ; it is more depressed, acutely angulate at the periphery, white or whitish in colour, encircled above by one or two narrow reddish lines, apex usually pale yellow, and the basal callosity thin and white. I distinguish it by the name of Var. ALBINEA, Pse. T. crassa, lenticularis, sublavigata, vix nitida, tenuissime et arcuatim striata, albida, supra lineis 1-2 rufescentibus infra albida; spira depressa, obtusa, plerumque pallide ; anfr. 5, planulati, indistincte marginati; ultimus convexus, subtus ad peripheriam distincte marginatus; apertura lunaris, intus pallide straminea ; peristoma intus callosum, callus basalis tenuis, albidus. Diam. 121, alt. 5\ mill. H. maugerice, Gray, and all its varieties, occur only on the island of Raiatea. HELICINA CALLIOSTOMA, Pse. T. crassa, globoso-conoidea, tenuissime radiatim striata, pallide straminea aut albida, interdum rufescente fasciata maculata; spira vix elevata, conoidalis; sutura bene impressa; anfr. 5-6, plano-convexi, ultimus ad peripheriam rotundatus, basi convexus; apertura obliqua, lunaris; columella brevis, supra vix dilatata, cum perist. angulum acutum formans peristoma valde incrassatum, interdum duplicatum, album, expansum et eversum, marginibus late disjunctis; callus basalis tenuis, parvus, albidus. Alt. 7\, diam. 7h mill. Hab. Insulae Marquesas. The colour of this species is probably much more varied than noted above. HELICINA TAHITENSIS, Pse. Helicina pi sum (Hombr. non Phil.) Voy. Pole Sud, vol. v. p. 44, pl. 11. f. 18-22. |