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

 PlTYS FILOCOSTATA, Pse. 



T. discoidea, late umbilicata, tenuiuscula, rudiatim oblique et remote 

 filocostata ; spira depressa, planulata, sutura bene impressa ; 

 anfr. 4, convexi, idtimus rotundatus, umbilicus ~ diametri occu- 

 pans ; apertura vix obliqua, sub circular is ; paries aperturalis 

 lamellis 2 intranlibus munitus ; perist. simplex, rectum ; flavido et 

 rufo alternatim strigata, strigis flexuosis, epidermide tenui induta. 

 Diam. 4, alt. 2 mill. 

 Sab. Insula Kauai. 



Allied to P. hystrix, Migh. It may be distinguished at once by 

 the thread-like character of its ribs, which are remote and shining 

 white when the shell is in good order. It is also smaller, and the 

 whorls are regularly convex. The radiatiug stripes are curved and 

 flexuous. 



PlTYS ANALOGICA, Pse. 



T. aperte umbilicata, solidiuscula, radiatim forte costata, costis ad 

 peripheriam flexuosis , interstitiis transversimfere obsolete striatis ; 

 spira fornicato-convexa, apice depresso, sutura valde impressa ; 

 anfr. 7 , rotundato- convexi, lente accrescentes, uhimus ad peri- 

 pheriam late rotundatus ; apertura vix obliqua, semilunaris, la- 

 mellis 7 coarctata, 2 parietalibus, 3 basalibus, 2 columellaribus ; 

 perist. simplex ; Jlavido et rufo irregulariter radiatim strigata. 



Diam 5|, alt. 3 mill. 



Hub. Insul. Marquesas. 



PlTYS VERECUNDA, Pse. 



T. planorboidea, tenuiuscula, late umbilicata, radiatim regulariter 

 tenuicostulata, supra planulata, sutura impressa ; anfr. 6, con- 

 vexi, ultimus ad peripheriam rotundatus, umbilicus fere \ diametri 

 occupans ; apertura late lunaris, lamellis 6 coarctata, 2 parieta- 

 libus, 3 basalibus, unnque columellari ; perist. simplex; flavida, 

 pallide rufo flexuoso-strigata. 



Diam. 5, alt. 1| mill. 



Hab. Insul. Marquesas. 



The above two species are the first of the genus discovered on the 

 Marquesan Islands. 



Genus Endodonta, Alb. 



This genus was founded by Dr. Albers on //. lamellosa, Fer., 

 which represents a group of species of peculiar characters inhabiting 

 the Hawaiian Islands, and confined to that locality. Most authors 

 have confounded it with Pitys (Beck), from which it differs in both 

 shell and animal. 



At the Tahitian Islands a group of species occurs nearly related 

 to the above, which are also confined to that locality, none similar 

 having been discovered in any other part of Polynesia. They are 

 peculiar in being loosely coiled, and more widely umbilicate than any 

 other species of Helicince ; they are widely distributed over all the 

 islands, and are more or less nearly related to each other and to the 



