466 MR. HARPER PEASE ON POLYNESIAN LAND-SHELLS. [May 2, 



* 



The following species, credited to Polynesia, I exclude from the 

 catalogue, viz. : — 



H. crassilabris, Phil., does not inhabit the Sandwich Islands. 



H. bicolor, Pfr., is credited to Tahiti, which is without much 

 doubt an error, as no species of its size inhabits Polynesia except H. 

 maugeria, Gray, from which, or any of its varieties, it differs widely. 



Helicina maugerle, Gray. 



The type of this species is a thick solid shell, rather bluntly an- 

 gulate 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, sublcevigata, vix nitida, tenuissime radiatim 

 et arcuatim striata, albida, supra lineis 1-2 rufescentibus cingu- 

 lata, infra albida ; spira depressa, obtusa, plerumque pallide fia- 

 vescens ; anfr. 5, planulati, indistinete marginati ; ultimus basi 

 convexus, subtus ad peripheriam distincte marginatum ; apertura 

 lunaris, intits pallide straminea ; peristoma intus callosum, albi- 

 dum ; callus basalis tetiuis, albidus. 



Diam. 12i, alt. b\ 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, omnino 

 pallide straminea aut albida, interdum rvfescente fasciata vel 

 maculata ; spira vix elevata, conoidalis ; sutura bene impressa ; 

 anfr. 5-6, plano-convexi, ultimus ad peripheriam rotundatus, 

 basi convexus; apertura obliqua, lunaris; columella brevis, in- 

 crassata, supra vix dilatata, cumperist. angulum acutum formans ; 

 peristoma valde incrassatum, interdum duplicatum, album, vix 

 expansum et eversum, marginibus late disjunctis ; callus basalis 

 tenuis, parvus, albidus. 



Alt. 7gi diam. 7\ mill. 



Hab. Insulse Marquesas. 



The colour of this species is probably much more varied than 

 noted above. 



Helicina tahitensis, Pse. 



Helicina pisum (Hombr. non Phil.") Vov. Pole Sud, vol. v. p. -1-i, 

 pi. 11. f. 18-22. 



