MOELLENDORFF : LAND SHELLS OF CAROLINE ISLANDS. II9 



47b.— Gappettia earolinarum sub-sp. turrita, Mlldff. 



Diadema caroUnarum var. turrita, Mlldff., 1. c, p. 168. 



Hah.—Mtxtik, Ponape (Kubary). 



Still higher, 7^ whorls, the last without any indication of the 

 perispherical keel. 



Without the knowledge of the preceding subspecies I should not 

 have hesitated to describe this form as a separate species. But 

 2)yramis is exactly intermediate between it and the type and there can 

 be no doubt that turrita is merely an extreme development of 

 caroUnarum. 



48.— Garrettia soluta (Mlldff.). 



Diadema solutum, Mlldff., N. BL, 1S97, p. 169. — Kob. et Mlldff., 

 ibid., 1898, p. 156. 



Hah. — Ponape (Etscheid, Kubary). 



By its shape and sculpture this remarkable little shell resembles 

 some species of Heteropoma (Mariannes and Philippines), but it 

 possesses a corneous multispiral operculum and must, therefore, be 

 classed with Garrettia. It is well characterised by the free body 

 whorl, disconnected for about -5 of its length. 



49.— Quadrasiella ammonitella, n. sp. 



T. late et aperte umbilicata, discoidea, sat tenuis, confertim 

 spiraliter lineata, costis crassiusculis distantibus sculpta, opaca, 

 corneolutea. Spira parum emersa, apice mucronato glabrato. Anfr. 

 4 convexi, sutura profunde impressa, disjuncti, ultimus ad peripheriam 

 nee non infra et supra illam distincte angulatus. Apertura vix 

 obliqua, fere circularis, peristoma rectum, obtusum. Operculum intus 

 corneum, multispirale, extus lamella cartilaginea plicatula, peristoma 

 superante praeditum. 



Diam. 3'2, alt. i"5. 



Hah. — -Ponape, in the hills (Kubary). 



The genus Quadrasiella was established by myself for two species 

 discovered by Quadras on the island of Guam,^ its chief characteristic 

 being the operculum. This consists of an inner corneous lamella which 

 overlaps the peristome somewhat in the manner of Aidojjoma, and an 

 outer calcareous one which is elongated above and below into a wing- 

 like process. This outer calcareous lamella is wanting in the Caroline 

 species, but the operculum is exactly like the inner lamella of that of 

 Quadrasiella. It is possible that the outer lamella, which is easily 

 broken off in the typical species, has fallen off from my two examples 



I N. Bl., 1894, p. 38. 



