84 CALIFORNIA ACADEMY OF SCIENCES. 



"Dr. J. G. Cooper found Ancyli 7,100 feet above the 

 sea in the Sierra Nevada." This locaHty was near that 

 of the Sp/icen'iini in Johnson's Pass, but by some mistake 

 Mr. Binney seems to have referred the specimen to A . 

 catiriniis, as he tabulates it on p. 145 as "No. 9,098 from 

 Cahfornia (Judge Cooper)," the type of A. caurinus be- 

 ing really from Black River, as stated at top of the page. 

 It was probably one of the forms here called subalpiniis. 



Another error on p. 144 is quoting No. 9,203 '•'•A.pa- 

 telloides Lea," as from San Francisco, no species like it 

 being known from near the bay, the nearest being from 

 northern California. 



While the forms here figured are not very similar to 

 any other American species, it is remarkable that a terti- 

 ary fossil species of Western Europe (A . matheronii) has 

 almost exactly the form of A. fragUis here given, with 

 the size of A. cattriniis, or larger. It is figured in Nich- 

 olson's Manual of PalcKontology, Vol. II, fig. 45. The 

 only species yet found fossil in the United States are very 

 different, but rather closely related to A . crassus and to 

 Acroloxus nuttalli oi Oregon. (See "Non-Marine Foss. 

 Moll, of North America," by Dr. C. A. White, in 3d 

 Ann. Rep. of U. S. Geol. Sur., 1881-2, p. 451, and fig- 

 ures.) 



Planorbis subcrenatus Carp., var. disjectus, fig. 30. 

 Characters. Differs from the typical form in having but 

 four whorls, more rounded, smoother, and the outer ones 

 more or less irregularly coiled, in a different plane from 

 the inner. Length 0.70, height 0.50, breadth 0.30 inch. 

 Varies considerably in height and breadth. 



This form has the same deformity on which E. Inger- 

 soll founded his '■'■ Helisonia plcxata"' (Report of the 

 Geol. and Geog. Survey of the Territories, 1876, p. 

 402). Our upper figure shows the same style of disloca- 



