Arnold: Laguna between Los Angeles and Whittier (II. Han- 

 nibal); Coyote Slough, half way between Whittier and La 

 Mirada (II. Hannibal); Coyote Slough, La Mirada (II. Han- 

 nibal); Coyote sloughs below S. 1\ R. R., between La Mirada 

 and Westminster (II. Hannibal); ditches, Los Alamos sugar- 

 works ( II. Hannibal ). 



Artificial pond. Ontario, San Bernardino Valley (water 

 from San Antonio Canon) (R. II. Tremper) ; Bosch reservoir, 

 Ontario (water from San Antonio Canon) (R. IT. Tremper); 

 eienaga, seven miles south-east of Ontario ( R. II. Tremper); 

 pond. England Park, Redlands (S. S. Berry) tide Berry; its 

 ervoir, mile north of Corona, Temeseal Wash (U. Hannibal); 

 Lake Elsinore, Elsinore (Mrs. M. Baldridge) (.Mrs. W. L. 

 Ball) (R. II. Tremper) (H. Hannibal); San Jacinto River. 

 Perris, Perris Valley (H. Hannibal); Lower Hemet Reservoir, 

 Hemet, San Jacinto Valley (II. Hannibal); irrigating ditches 

 near San Jacinto (Mrs. C. Stephens). 



Upper Hemet Reservoir, San Jacinto Mountains (II. Han- 

 nibal). 



Near San Diego, San Diego Mesa (Pac. R. R. Sur.) fide 

 Binney ; Mission Valley (Mrs. C. Stephens); reservoirs on La 

 Mesa road, four miles east of San Diego (II. Hannibal); La 

 Mesa Reservoir (II. Hannibal) ; Linda Lake, Lakeside (II. Han- 

 nibal i ; Sweetwater Reservoir (II. Hannibal) ; reservoir between 

 Upper Otay and Sweetwater Dam (II. Hannibal) ; Otay Creek, 

 mile below Lower Otay (H. Hannibal); Lower Otay reservoir 

 (II. Hannibal). 



Arizona System: (semifossil) Indio, Colorado Desert ( R. 

 E. 0. Stearns) fide Stearns, (II. Hemphill), (II. Hannibal); 

 (semifossil) New River, Laguna ( E. A. Mearns) tide Dall; 

 semifossil) road between Carrizo Creek and Laguna Moun- 

 tain below old beach line (Mrs. 0. Stephens); (semifossil) 

 mar Monument 21!t. International Boundary (E. A. Mearns) 

 fide Dall. 



(Semifossil) Gardner's Laguna, Baja California (E. A. 

 Mearns fide Dall; (semifossil) Laguna Maquata (C. R. Or- 

 eiilt Mile Stearns. 



Colorado River, Yuma, Arizona, tide Cooper, (E. A. Mearns) 



tide Dall; Santa Cruz River. Tucson (E. A. Mearns) fide Dall; 

 Seven Wells i E. A. Mearns) tide Dall: irrigating ditches, Phoe- 

 nix ( V. Bailey) tide Stearns; Sonoyta River near International 

 Boundary (E. A. Mearns) fide Dall. 



San Bernardino River, near International Boundary. So- 

 nora (E. A. Mearns) fide Dall; San Bernardino River. New- 

 Mexico I E. A. Mearns i tide I )all. 



Planorbis parvus Say, Nieh. Encyc. (1st Ed.), H. 1*17. PI. 

 I. •"»; P. parvus Binney, L. ,V: F. W. Shells N. Am.. II. 1865, 113, 

 fig. 222--A mot characteristic), not fig. 224 S. alba Muller; 

 ::: P. parvus Hannibal. W. Coast Shells. Din. 310, PL II. 11; 



