VERTIGO. 97 



(Nautilus XXV, 1912, p. 124). That is a larger shell, less 

 inflated, with longer palatal folds, but very similar to the 

 present form in sculpture. 



Vertigo columbiana Sterki. Vol. 25, p. 109, 18th line. 

 Eeference to figure of type of V. c. utahensis should stand: 

 PL 12, fig. 13. 



Vertigo californica catalinaria (Sterki). PI. 15, fig. 8. 



The specimens from Guadalupe Island, off Lower Cali- 

 fornia: at Northeast Anchorage and 1000 ft. above, and 2 

 miles north of the south end on the east side (G. D. Hanna), 

 are darker than the Santa Catalina Island form, but no other 

 difference was detected. There is some variation in diameter 

 among them, also in the spacing of the ribs, the specimen 

 figured having them more widely spaced than some others. 



Length 1.95, diam. 1 mm. 



Vertigo californica catalinaria (Sterki), Pilsbry, Proc. Cal. 

 Acad. Sci. (4), XVI, 1927, p. 174, pi. 7, f. 5. 



Vertigo californica guadalupensis Pilsbry. PI. 15, fig. 7. 



The differential characters of this form are that it possesses 

 a distinctly developed angular lamella standing about midway 

 of the length of the long parietal lamella, and the striation is 

 quite fine, there being about 30 striae in 1 mm. on the face 

 of the last whorl. Length 2 mm. ; diam. 1.1 mm. 



Guadalupe Island, Lower California; collected about 1000 

 feet above the landing at Northeast Anchorage by G. D. 

 Hanna. 



Vertigo californica guadalupensis Pilsbry, Proc. Cal. Acad. 

 Sci. (4), XVI, 1927, p. 175, pi. 7, fig. 4. 



In most groups of Vertigo the presence or absence of an 

 angular lamella has little significance, but in the V. californica 

 group I have never seen this lamella in hundreds of shells 

 examined. However, Dr. V. Sterki has mentioned seeing 

 *' traces " of an angular lamella in some specimens of V. 

 californica, which is a larger, more coarsely sculptured form 

 than V. c. guadalupensis. I have thought it best to name this 



