120 MOELLENDORFF : LAND SHELLS OF CAROLINE ISLANDS. 



or that they are not quite full grown. The general shape of the shell, 

 the sculpture and the mucronate apex agree very well with the species 

 of Guam, and I have but little doubt that I am right in ascribing the 

 shell of Ponape to Quadrasiella. 



50.— Gonatorhaphe ineisa (Hombr. et jacq.). 



Cydostoma incixa, H. et J., Voy. Pol. Sud. Zool., v, p. 49, t. 12, figs. 

 II — 15. — Cycloplwrus incisns, Pfr., Mon. Pneuni. suppl., i, p. 54. 

 — Gonaiorhaphe ineisa, Kob. et MUdff., N.Bl., 1898, p. 155. 



Hah. — Hogolu = Ruk (Hombron et Jacquinot). 



From the meagre description which Pfeiffer made "ex icone," I 

 can only conclude that this species belongs to my genus GonatorJia^jlie, 

 constituted for certain operculate shells of Melanesia and Polynesia, 

 type G. redu::iatia, Pfr. They have the general outline of Cijclutus, 

 sharp spiral ribs, a more or less canaliculate suture, marginate by 

 a keel or elevated line, and an operculum somewhat like that of 

 Cijdoius but without the marginal channel. It has nothing to do 

 either with Ci/dophonis or Cydotus, but belongs to the Realiidae. 



Fam. TRUNCATELLIDAE. 



51.— Truncatella paeifiea, Tease. 



Am. Journ. Conch., 1867, iii, p. 230, t. 15, f. 27. — Pfr., Mon. 



Pneum. suppl., iii, p. 15. 

 Hah. — Ualan (Pease), Ponape (Etscheid). 



Closely related to Tr. valida, Pfr., and perhaps only a subspecies 

 of that widely distributed species. 



Fam. HELICINIDAE. 

 52.— Helieina (Pleuropoma) humilis, Hombr. et jacq. 



H. et J., Voy. Pol. Sud. Zool., v, p. 45, t. 11, figs. 27 — 31. — Pfr., 

 Mon. Pneum. suppl., i. p. 189. 



Hah. — Hogolu = Ruk (H. et J.), Ponape (Etscheid, Kubary). 



Fresh examples show some spiral, elevated, membranaceous lines, 

 which are easily rubbed off. The operculum is typical of my sub- 

 genus Pleuropoma. 



53.— Helieina (Pleuropoma) zigzag, Pse. 



Am. Journ. Conch., 1867, iii, p. 229, t. 15, f. 26. — Pfr., Mon. 



Pneum. supppl., in', p. 280. 

 Hah. — Ualan (Pease), Ponape (Etscheid, Kubary). 

 My examples from Ponape agree in part with Pease's description, 

 but some are larger, up to 9! : 5-5- mm., thinner and less sharply keeled. 



