THE COOK'S OR HARVEY ISLANDS. 399 



in the numerous examples before me, and the last one equals about one-third the 

 length of the shell. 



The open umbilicus, small parietal lamina, and simple columella are its most 

 obvious characters, and will distinguish it at once from any other South Polyne- 

 sian species. 



T. SERRATA, Pease. 



Lamellina serrata^ Pease, Proc. Zool. Soc, 1860, p. 439; 18tl, p. 473. 



Lamellina laevis, Pease, Proc. Zool. Soc, 1864; 1871, p. 473. 



Torriatellina serraia, Pfeiffer, Mon. Hel., vi. p. 265; viii. p. 319. Garrett, Proc. Phila. Acad. 



Nat. Sci., 1879, p. 25. 

 Tornatellina Istvis, Pfeiffer, Mon. Mel., vi. p. 266; viii. p. 319. 



Not uncommon in the low^-land forests near the sea-shore, and ranges through- 

 out the group. - 



It also occurs in the Austral and Society Islands, and probably extends its 

 range through the small islands in " Central Pacific'' to the Marshall or Caroline 

 Group, where I obtained Mr, Pease's type specimens of serrata. 



Its ovate-conic form, swollen whorls, acute columellar tooth, and the longitudi- 

 nal, smooth, or serrated laminae in the palate will easily distinguish it. 



For further remarks on the synonymy of this species, and observations on Mr. 

 Pease's genus Lamellina, see my paper on the Purutu Land Shells. 



T. NiTiDA, Pease. 



Tornatellina nitida, Pease, Proc. Zool. Soc, 1860, p. 439; Jour, de Conch, 1871, p. 93; Proc. 



Zool. Soc, 1871, p. 473. Pfeiffer, Mon. Hel., vi. p. 264; viii. p 317. Garrett, Proc Phil. 



Acad. Nat. Sci., 1879, p. 22. 



Abundant in all parts of the group, and ranges from the Paxmotus to the 

 Caroline Islands. 



A thin transparent species with a more tapering spire than ohlonga, with the 

 twisted columella of conica, but distinguished from either by the acute tooth-like 

 plication on the columella. 



For further remarks see my paper on the Purutu Land Shells. 



T. CONIOA, Mousson. 



Tornatellina conica, Mousson, Jour, de Conch , 1869, p. 342, PI. 14, fig. 8; 1870, p. 128; 1871, 



(var. impressa), p. 16; 1873, p. 106 Pease, Proc. Zool. Soc , 1871, p 473. Pfeiffer, Mon. 



Hel , viii p. 316. Garrett, Proc. Phil. Acad. Nat. Sci , 1879, p. 21. Schmeltz, Cat. Mus. 



Godeff., V. p. 89. 

 Cionella conica, Paetel, Cat. Conch , p. 106. 

 Tornatellina oblonga, Pease (Part), Proc. Zool Soc , 1864, p. 673. 



