256 PARTULA, BORABORA. 



Partula lutea LESSON, Voy. autour du Monde La Coquille, 

 Zoologie, ii, pt. 1 (1831), p. 325. PFEIPFER, Mon. Hel., iii, 

 p. 453. PEASE, Proc. Zool. Soc., 1871, p. 473. HARTMAN, 

 Cat. Part., p. 8 (with woodcut) ; Obs. Gen. Part., Bull. Mus. 

 Comp. Zool., ix, p. 184, part. GARRETT, J. A. N. S. Phila. 

 ix, 1884, p. 53. Bulimus luteus DESHAYES, in Fer., Moll., ii, 

 p. 123, pi. 158, figs. 17, 18. PPEIFFER, Mon. Hel., ii, p. 229.- 

 Partula solidula Rve., PFR., Monogr. iii, p. 452 ; Conchy!. Cab., 

 Bulimus, pi. 64, f. 15, 16; pi. 65, f. 12, 13. SCHMELTZ, Cat. 

 Mus. Godeff., v, p. 92 (not of Reeve). Partula lilacina 

 PFEIFFER, Proc. Zool. Soc., 1856, p. 334. 



This is a rather solid, obesely ovate-conic shell, with 

 straightly conic, acute spire and rather glossy surface. The 

 spiral striation is generally weak in the median part of the 

 last whorl, more distinct above and below. The first two 

 whorls are flattened and slope steeply, giving the apex a more 

 acutely conic shape than usual. Whorls 5, the post-embryonic 

 ones rather convex, last whorl inflated. The aperture is 

 somewhat oblique; outer lip reflexed and thickened within, 

 white. Columellar margin only very little dilated at its in- 

 sertion, near which it is thickened by a callous deposit on 

 the inner margin of its face. The parietal wall is covered 

 with a transparent callus, which near the lip-ends is thick- 

 ened and white. There is no parietal tooth. The umbilicus 

 is reduced to a very narrow, short chink. The color is 

 variable : 



1. Uniform pale yellow. 



2. Pale yellow with brownish apex. 



3. Isabelline, the first 2y 2 whorls purple-brown or blackish 

 violet. 



4. Purple-brown, covered on the last whorl with a yellow 

 cuticle, which is thin and transparent on the spire, the 

 suture white (lilacina Pfr.). 



The size and snape vary. Lesson 's type was evidently near 

 the small extreme in size. Shells from a lot collected by 

 C. D. Voy, color-forms 2, 3, 4, measured : 



Length 19, cliam. 11, aperture 10.1 mm. 



