PARTULA, RAIATEA AND TAHAA. 227 



29. P. RUSTICA Pease. PL 19, figs. 12, 15 to 18. 



The shell is rather openly umbilicate, obesely ovate-conic, 

 somewhat thin. Surface rather dull, lightly marked with 

 growth-lines and spiral engraved lines, which are generally 

 subobsolete on the last whorl except near suture and base; 

 chestnut-brown, sometimes ha.ving a pale belt, or pale brown- 

 ish-corneous, the summit or spire purplish-brown. Spire 

 conic with straight outlines; whorls 4%, slightly convex, the 

 last rotund. The umbilicus has a more or less distinct spiral 

 groove or excavation within. Aperture subvertical, ovate, 

 dark flesh-colored within ; peristome narrowly expanded, 

 thickened within, noticeably narrower near the upper inser- 

 tion. Columellar margin sinuate d or weakly nodose with- 

 in; in oblique view less wide than P. crassilabris. Parietal 

 wall covered with a transparent callus which is rather thick 

 at the edge, and often bears a very small tooth far within. 



Length 16.7 to 17.7, diani. 11 mm. 



Length 16, diam. 10 mm. 



Raiatea: The metropolis of this species is in a large 

 valley called Toloa, on the west coast of Raiatea, where it 

 occurs in great abundance beneath decaying vegetation. It 

 has migrated to the southward into two small adjacent val- 

 leys, but does not extend its range so far as Hapai, the next 

 large valley, and the home of the allied P. crassilabris. 

 (Garrett] . 



Partida rustica PEASE, Amer. Jour. Conch., 1866, p. 199; 

 1867, p. 81, pi. 1, fig. 5; Proc. Zool. Soc., 1871, p. 473.- 

 SCHMELTZ, Cat. Mus. Godeff., v, p. 207. PFEIFFER, Mon. 

 Hel., viii, p. 205. GARRETT, Journ. A. N. S. Phila., ix, 1884, 

 p. 77. Partula crassilabris GLOYNE (not of Pease), Quar. 

 Jour. Conch., i, p. 338. HARTMAN, Ca.t. Part,, p. 9; Obs. 

 Gen. Part., Bull. Mus. Comp. Zool., ix, p. 187 (part).- 

 Partula pinguis GARRETT, 1. c. p. 77. 



Described from Pease's type lot, no. 59480 A. N. S. P. 

 Garrett writes as follows: "It is larger, less globose, the 

 aperture more oblong, than P. crassilabris with which it has 

 been confounded. Its chief character consists in the colu- 



