384 PROCEEDINGS OF THE ACADEMY OF [May, 



or reddish. The lip is very slightly expanded, narrowly white- 

 bordered within, and the columellar margin concave with no trace of 

 a tooth. The embryonic whorl, when unworn, has radial wrinkles 

 as in veatchii; the spire is not granular, and the last whorl shows 

 spiral incised lines. Alt. 15, diam. 18 mm., 4f whorls. It was this 

 form which I dissected, under the name of "E. p. honitosensis." 



M. pandorw is anatomically similar to veatchii on a smaller scale. 

 It belongs, I think, nearer veatchii than to any other species. As in 

 other races of these small arid islands, pandorce is conspicuously 

 reduced in size, probably through the continuous influence of short 

 active and long dormant periods. 



The specimens figured are from S. Benito Island, collected by 

 Anthony and Hemphill. 



Micrarionta veatchii ('Newc' Tryon). Plate XV, figs. 1 to 7 (varieties figs. 8 to 16). 



Arionta veitcMi [error for veatchii] Newcomb, Tryon, American Journal of 

 Conchology, II, p. 316, pi. 22 (5), fig. 19, 1866. Ill, p. 162, 1867. 



Helix veatchii Stearns, Proc. Cal. Acad. Sci., Ill, p. 328, 1867. 



Helix areolata W. G. Binney, Land and Fresh-water Shells of N. A., I, p. 177, 

 fig. 311, two figures in the middle. 



A fine species, known by its large size, turbinate, elevated shape 

 (which, however, is variable), and the coloration, somewhat like 

 Helix aspersa, but also very variable; the embryonic shell when 

 unworn is finely irregularly wrinkled radially. There is never any 

 trace of a columellar tooth. It was described from Cerros Island, 

 where Veatch collected it in 1859, and the typical form at least is 

 confined to that place. 



In specimens collected at the north end of Cerros Island by Mr. 

 H. N. Lowe in 1912 (pi. XV, figs. 2, 3), the foot and sole are pale 

 gray, back brownish-gray, paler towards the shell, near the edge 

 yellowish -gray, under a lens seen to be closely peppered with yellow 

 dots on a dark gray ground. A specimen of the same lot having the 

 shell light colored (pi. XV, fig. 1) has the animal gray-brown through- 

 out, a little darker on the back. The tail is depressed, back with 

 the usual pair of grooves. In walking, the muscular waves extend 

 entirely across the sole, and are about 5 mm. apart, more separated 

 towards the tail. Foot about 60 mm. long. The shell in this lot 

 (pi. XV, figs. 1, 2, 3) varies notably in degree of elevation and in 

 color. The ground is pink-white; some shells are boldly marked 

 with blackish-chocolate bands, as many as eleven in fig. 3. Others 

 have the shoulder band well developed, several others weakly traced, 

 fig. 2. In others, all the bands present are very weak, fig. 1 ; or again, 

 the shoulder band alone is indicated by an interrupted dark fillet. 



