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 20y 2 

 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). PI. 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- 



