PARTULA, RAIATEA AND TAHAA. 235 



Cat. Mus. Godeff., v, p. 207 GARRETT, Jour. A. N. S. P., ix, 

 1884, p. 77, pi. 3, f. 47. Partula ovalis PEASE, Amer. Jour. 

 Conch., 1866, p. 194; Proc. .Zool. 1871, p. 473. PFEIFFER, 

 Mon. HeL, viii, p. 205. 



This is a very thin member of the faba group, deficient in 

 lip callus and teeth, smaller and more lightly built than 

 P. fusca, which is also a ground snail. 



The race described by Pease as P. ovalis (pi. 19, fig. 7) 

 differs from lugubris only by being a little larger, more solid, 

 with a stronger lip-callus. It replaces lugubris in Vaiau 

 valley, the typical lugubris being confined to Hapai valley. 

 It approaches very near to P. vittata, which is a larger form 

 with longer spire and a small parietal tooth. The ovalis form 

 is usually dark chestnut with a yellowish belt, but sometimes 

 is of a uniform chestnut hue. 



Mr. Garrett writes: "My largest Vaiau specimens are 20% 

 mm. long, -and 11 mm. in diameter. The smallest adult from 

 Hapai is 16 by 8 mm. I have found hybrids between lugubris 

 and imperforata, the latter a strictly arboreal species. 



"Dr. Hartman, overlooking the fact that lugubris, ovalis, 

 protea and fusca inhabit widely separated valleys, has sug- 

 gested that the three former may be the juvenile and adoles- 

 cent forms of the adult fusca. The habitats of the two former 

 species are about two miles apart, and five miles south of the 

 location of fusca. P. protea, which = fusca, is confined to 

 the opposite side of the island, and is separated from the lat- 

 ter by an almost inaccessible mountain. ' ' 



35. P. FABA (Martyn). PL 16, figs. 1 to 8. 



The shell is dextral, openly perforate, obliquely ovate- 

 conic, rather solid, weakly striate obliquely, with close spiral 

 striation on the early whorls, almost obsolete on the last. 

 Spire straightly conic, of nearly 6 moderately convex whorls. 

 Aperture a little more than half as long as the shell, white or 

 flesh-colored inside. Peristome very broad, reflexed and thick- 

 ened within, white or flesh-tinted, flattened, the upper third of 

 the outer lip narrow. Columella vertical, its internal thicken- 



