142 CALIFORNIA ACADEMY OF SCIENCES. 



Patula horxi? Gabb. 



One perfect specimen was found in Saltito Pass, 3,200 

 feet, measuring 0.15 inch wide; color dark brown. I 

 supposed it might be a large Hvalina diegocnsis Hemp- 

 hill, until I detected the scattered bristles and coarser 

 opaque shell. It is new to the peninsula, having been 

 found only in southern Arizona before. Unfortunately, 

 it was crushed by accident. Another, bleached and im- 

 mature, occurred in a dead shell of Bulimulus. 



Hyalinia indentata Say. 



A few were also found on El Taste Mountains. 



Planorbis (x\nisus) anitensis J. G. Cooper. 



About twenty specimens from Santa Anita (the only 

 known locality) show a larger development of half a 

 whorl more, measuring 0.30 inch wide. They are figured 

 double natural size on pi. vi, figs. 22, 23. 



The compressed sub-marginal line on right side is so 

 faint in small ones that it was overlooked in the former 

 figure, though described. In the new specimens there 

 are also numerous more delicate revolving stria?, the outer 

 whorl being also less flattened toward the mouth. The 

 sinistral appearance both in this and P. pcniiisnlaris is 

 not in the outline or form of mouth, but in the flattening 

 of the left side."^ 



Planorbis peninsularis J. G. C. 



About fift}' more were brought from the same pond, 

 and nowhere else. The description is correct without the 

 (?), but the shell is a Nautilina (or Gyraulus) rather than 

 Anisus. In very young of this and of the preceding the 

 shell is often white and translucent. Figs. 24 and 25 

 represent this species double the natural size. See, also, 

 the enlarged figures in vol. iii, pi. xiv. 



'' The figure of this species {8a) as given in pi. xiv, vol. iii, has a defect in 

 the angular form of the right margin, caused by a fracture, but it must be easily 

 detected as an error on comparison with Sb. 



