170 PARTULA, MARQUESAS ISLANDS. 



Partula in flat a RVE., P. Z. S. 1842, p. 197; Conch. Syst. 

 ii, pi. 175, f . 11, 12 ; Conch. Icon. pi. 1, f . 3. PFR., Monogr. 

 iii, p. 452; Conchyl. Cab. p. 267, pi. 64, f. 5, 6. HARTMAN, 

 Oatal. p. 12. GARRETT, Bull. Soc. Malac. France iv, 1887, p. 

 25. Bulimus thersites PFR., Symbolae ad Hist. Hel. ii, p. 52 

 (1842) ; Monogr. ii, p. 75. 



Remarkable for its gibbous last whorl and broad white lip. 

 The very thin cuticle is more or less wholly lost in most 

 adult shells. The examples described are from the island of 

 Taiwata (=> Tahuata) ; whether those reported from Dom- 

 inique, the next island of the group, are identical with them 

 in all respects I do not know. 



2. P. GANYMEDES (Pfeiffer). PI. 30, figs. 4, 5, 6, 7. 



Shell umbilicate, oblong-conic, thin, minutely, strongly, de- 

 cussated with close growth-lines and extremely close, im- 

 pressed, wavy, spiral lines; dead white under a very fuga- 

 cious greenish-yellow epidermis. Spire conic, rather acute. 

 Whorls 51/0, a little convex, the last about as long as the spire, 

 very obsoletely angular in the middle, ornamented with one 

 rather wide chestnut band. Columella straightened. Aper- 

 ture oblong, obliquely truncated above ; peristome simple, thin, 

 broadly expanded throughout. Length 23, diam. 10y 2 , aper- 

 ture inside 10^x5 mm. (P/V.). 



Marquesas Is.: Dominique or Hivaoa, on trees (Garrett). 



Bulimus ganymedes PFR., P. Z. S. 1846, p. 39 ; Monogr. ii, 

 p. 72. Partula ganymedes PFR., Monogr. iii, 447; iv, 511; 

 vi, 160. REEVE, Conch. Icon, vi, pi. 3, f. 16. HARTMAN 

 Cat. Gen. Partula p. 11, with figure. GARRETT Bull. Soc. 

 Malac. France, iv, 1887, p. 26. Partula fasciata PEASE, 

 Amer. Journ. of Conch, ii, p. 202, 293. 



This species is variable in size, the degree to which the 

 cuticle is lost, and the color of what remains. Specimens of 

 one lot measure : 



Length 22, diam. 13, length aperture 12.8 mm. ; whorls 



Length 20, diam. 11.3, length aperture 11.1 mm. ; whorls 



In the typical form, the very thin pale green cuticle is. 



