344 CALIFORNIA ACADEIMY OF SCIENCES. 



character, though he thought it *' might be a land-shell," 

 it probably having been faded and the internal denticles 

 absent. (See Binney's Ed. of Say's Works, pp. 9, n, 

 63, and his Land and Fresh Water Shells, part 2, p. 135.) 

 There is certainly a close resemblance in this land-shell 

 to the toothed Planorbes of the subgenus Segmentina, 

 but none of them is described^as]having colored lines as 

 this has. 



Dr. Eisen also found in Sonora a Bulimidtis apparently 

 a small variety of B. alternatus Say, a widely spread 

 species of Mexico and Texas, very abundant at Hermo- 

 sillo. One Helix behri Gabb at Guaymas, and Patula maz- 

 atlanica Pfeiffer, north of Mazatlan — 5 or 6 dead. Hy- 

 alinia indentata Say, is another Sonoran species, named 

 in the previous article, p. 216. Also, Liniax (sp. indet.) 



EXPLANATION OF PLATES XIII, XIV. 



Fig. la, CoLUMNA RAMENTOSA X about 4. 16, Showing folds of anterior 

 whorl and narrowed '2d whorl. Ic, Lateral view of same. \d. Apical 

 whorls, the 2 nuclear with vertical, and 2 next with oblique ribs be- 

 coming ramentose on third, le, 1/, More magnified figures of sculp- 

 ture of four apical whoi'ls. 



Fig. 2a, CoLUMXA (var. ?) abbreviata X about 3. 26, 2c, as in \h, \r. 

 2d nuclear and .3d whorls. 



Fig. 3a, Melaniella eiseniana X nearly 9. 36, Kib sculpture of all the 

 whorls. .3c, Apical whorls, the 3d narrowed. 



Fig. 4a, 6, BuLiMULUs inscendens bryanti enlarged. 4c, Nuclear whorls. 



Fig. 5«, 6, BuLiMULUS inscendens beldingi enlarged nearly \. 5c, Kib 

 sculpture of apical whorls. 



Fig. 6a, 6, BuLiMULUs sufflatus insularis enlarged ^. 



Fig. 7a, lb, Helix areolata exanimata, plain and banded examples, a 

 little enlarged. 



Fig. 8a, 6, Planorbis (Anisus) anitensis X 10. 



Fig. 9a, 6, Planorbis (Ani.sus?) peninsularis X about 10. 



Fig. 10a, 6, c, Helicodiscus lineatus sonorensis X 14. lOd, Revolving 

 lines more magnified, crossed by lines of growth. 



