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 having 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 sinuated or weakly nodose with- 

 in; in oblique view less 1 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, diam. 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. 

 Bel., 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, Cat. 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- 



