STERKIA. 55 



Only three specimens were found by Mr. Hemphill on San 

 Clemente, one of which, no. 45479 A. N. S. P., is here figured. 



The surface shows very weak traces of low, widely-spaced 

 strias, usually hardly noticeable ; color between cinnamon and 

 cinnamon-buff, or paler. There is a distinct but shallow im- 

 pression over the upper palatal fold, running to the lip. The 

 angular lamella is longer and much lower than the parietal, 

 its summit depressed in the middle part ; it is nearly straight, 

 but curves outward a little to join the outer lip, with a rather 

 thick callous pad at the junction. The parietal lamella is 

 nearly straight. The columellar lamella is short, transverse 

 to the axis, its inner end thick. The upper palatal fold is 

 short, the lower higher, thicker and longer. A basal fold, 

 mentioned in Sterki 's description, is not present in the cotype 

 here figured. It was also absent in Sterki 's figure, drawn by 

 himself. 



Bifidaria Clementina oldroyda Vanatta, from Santa Bar- 

 bara I., stated to differ from Clementina by the absence of a 

 basal fold, appears to have no sufficient basis, since this fold 

 is also wanting in some, if not all, San Clemente shells of the 

 type lot. The type of oldrayd<e (figs. 10, 13) measures: 

 length 1.9, diam. 0.85 mm. ; S 1 /^ whorls. 



S. clem-entina differs from other West Coast species of the 

 genus by its relatively small, simple teeth. It is related to 

 the Antillean species and S. rhoadsi, but the columellar 

 lamella is not situated so high and differs somewhat in shape, 

 the palatal folds are nearer together, and there are more 

 whorls. 



5. STERKIA HEMPHILLI (Sterki). PI. 7, figs. 5-8, 11, 12. 



The shell is narrowly umbilicate and rimate, cylindric, 

 brown, resembling S. calamitosa; strongly rib-striate after the 

 1^2 smooth initial whorls, the ribs and intervals about equal 

 on the earlier, slightly more spaced on the last whorl. Whorls 

 4i/, strongly convex, the last slightly less convex, impressed 

 over the upper palatal fold, peculiarly swollen or obtusely 

 humped in the middle of the base, the umbilical margin im- 

 pressed beyond the hump, this impression forming a boss in- 



