PARTULA, SAMOAN ISLANDS. 265 



54. P. CONICA Gould. PL 32, figs. 1, 2, 3, 5 ; pi. 31, fig. 8. 



The shell is sinistral, openly umbilicate, conic, with rather 

 slender spire ; white under the thin yellow cuticle, the earlier 

 whorls and a subsutural margin being white. The surface 

 is glossy. Whorls 5%, the first half -whorl smooth, follow- 

 ing 2% whorls spirally engraved (fig. 8) ; on the following 

 whorls the spire striae are almost wanting, but they reappear 

 on the last whorl, which is very closely sculptured through- 

 out with fine wavy spirals, stronger towards the base. The 

 whorls are moderately convex, the last whorl rather swollen 

 peripherally and very convex at the base. The aperture is 

 ovate, rather oblique; peristome white, flatly, rather widely 

 reflexed, dilated at the columellar insertion and somewhat 

 excavated or grooved at its junction: with the base. Parietal 

 callus very thin, transparent. 



Length 25.5, diam. 16.5, aperture 15 mm. (figs. 1-3). 



Length 24.5, diam. 16.5, aperture 15 mm. (fig. 5). 



Sarnoan Is, : Tutuila; (Upolu?). 



Partula conica GOULD, Proc. Boston Soc. N. H. ii, 1848, p. 

 196; Expedition Shells, in Otia Conchologica, p. 33; U. S. 

 Expl. Exped. Mollusca, p. 81, Mm pi. 6, f. 88a. PPR., 

 Monogr. iii, 445; iv, 507; vi, 155; Novit. Conch, i, p. 120, pi. 

 34, f. 8, 9. MOUSSON, Journ. de Conchyl. 1865, p. 171, no. 11. 



In his descriptions of this species, Gould considered the 

 large, more or less chestnut colored and smoother form later 

 described as P. canalis to be -a form of conica, and he also, 

 by implication, included the dextral form, his words "in- 

 terdum sinistrorsa" indicating that he 'had seen dextral ex- 

 amples. It is obvious that Gould considered the sinistral 

 form to be typical from his selection of sinistral examples 

 for figuring, and from his comparison "resembling Bulimus 

 l&vus in form"; yet his description is composite, the num- 

 ber of whorls referring especially to the larger brown form 

 (canalis) and the description of sculpture to the striate form 

 here considered to be the true conica. Garrett's restriction 

 of P. conica to the dextral form was not allowable under the 

 existing conditions. 



