26 THE NAUTILCS. 



despair he had given up negotiations with the Spanish monarchs and 

 was actually on his way to France. 



I was accompanied on these trips by William M. Bunker, Hon- 

 orary President of the San Francisco Chamber of Commerce. Mr. 

 Bunker assisted in turning over many large stones, adhering to the 

 under surface of which the majority of the specimens were found. 



Leucochroa candidissima Drap. This species lives on the southern 

 sides of the Sierra. 



Helix sp. A small form of the caperata group. 



Helix alonensis Fer. (pi. IV, fig. 5). One example obtained. 



Helix (lberus~) gualtierana Linn. Plate IV, fig. 1 (typical), 2, 3, 

 (convex form). 



Eighteen specimens are before me: a selection made with a view 

 to proportion, arranging these in lots according to the height of the 

 spire, there are : 



10 shells with a flattened spire (a few are sunken above) (fig. 1). 



4 shells in which the spire is more produced (fig. 2). 



4 shells with the highest spire (fig. 3). 



In the first lot the examples appear to approach closely the typical 

 form of gualtierana, which was described by Linn. The typical 

 form may easily be distinguished by the flattened or sunken spire, 

 the half or nearly covered umbilicus, the strongly carinated peri- 

 phery and the aperture which is decidedly broader than high. 

 Pilsbry's figure (Manual, Vol. IV, plate 53 fig. 6) agrees perfectly. 



A variety (plate 4 fig. 2) has the aperture of the type but with a 

 more developed spire. In the third lot (fig. 3) the shells run 

 about the same size as the type. The peripheral keel is similar. 

 On the other hand the aperture is of a distinctly different shape. 

 In the majority of the examples examined it is nearly as high as 

 wide, less extended laterally than in the typical form. 



Helix gualtierana var. laurenti Bourguignat (Revue et mag. de 

 zoologie, 1870, p. 05, pi. 14, figs. 5-7) was based on a shell from Mt. 

 Gador, near Almeria. It is decidedly conic above, the apical 

 portion is not depressed as in convex forms of gualtierana though a 

 little flattened at the tip ; the base is figured as rather strongly 

 convex. Figs. 11-13 of pi. 53, Man. Conch. IV, are similar though 

 larger, but figs. 9, 10, copied from Kobelt, cannot be this race. 



I took a solitary example, dead and bleached, which agrees with 

 the original account of laurenti in the conic top. It is solid, much 



