Physa aiirantius, Cjir. 



Near Acapulco, Mexico. 



Patella viridula. 



Valparaiso. 



Patella Aiiracania, D'Orb. 



Valparaiso. 



Patella Auracania, D'OrJ. vnr 



Valparaiso. 



Monoceros citrinum, Sby. 



Chili. 



Littorina zebra. 



Valparaiso. 



Turbo uiger, Lesson. 



Chili. 



Chlorostoma ater, Lesson. 



Chili. 



Ampullaria canalis, UOrh. 



Bolivia. 

 Collected by Robert E. C. Stearns. 



Ischnoradsia regularis, Cpr. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



( licietopleiira Hartwegii, Cpr. 



Monterey, California. 



Collected by Robert E. C. Stearns. 



Leptochiton rugatus, Cpr. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Ischnochiton radians, Cpr. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Trachydermon fallax. Cpr. 



Monterey, California. 



Collected by Robert E. C. Stearns. 



Lepidopleurus Niittalli, Cpr. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Nacella vernalis, Dall. (Mss.) 



Monterey, California. 

 From Robert E. C. Stearns. 



Pisidium occidentale, Newc. 



Mendocino County, California. 

 From Robert E. C. Stearns. 



Pisidium Harfordiana, Prime., 



Mendocino County, California. ]^]\Iss. 

 Collected by Robert E. C. Stearns. 



Katherina tunicata, Wood. 



Lobitas, California. 

 Collected by Robert E. C. Stearns. 



Tonicia lineata, Wood. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Mopalia muscosa, Gld. 



Baulines Bay, California. 

 Collected by Robert E. C. Stearns. 



Mopalia Wossnessenskii, 3Iidd. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Mopalia Hindsii, Graj/. 



San Francisco Bay, California. 



Collected by Robert E. C. Stearns. 



Mopalia Merckii, 3Iidd. 



Monterey, California. 

 Collected by Robert E. C. Stearns. 



Nuttallina scabra, Rve. 



Purissima, California. 

 Collected by Robert E. C. Stearns. 



Lepidoradsia Magdalensis, Hds. 



Monterey, California. 



