308 WEST SOUTH AMERICAN SHELLS STEARNS. 



The principal localities referred to iu this list are, commeDcing- at the 

 south: 



Valparaiso, Chile, latitude 33° S. 



Pacasmayo, Peru, latitude 7° 30' S. 



Payta, Peru, latitude 5° lij' S. 



Guayaquil, Ecuador, latitude 2° 11' S. 



Mauta, Ecuador, latitude 1° S. 



Chatham Islaud, Galapagos, latitude 1° S. 



Bahia (Pauguapi), Ecuador, latitude 3° N. 



Panama, Colombia, latitude 8° 19' N. 



Cape St. Lucas, Lower California, latitude 23° 4' N. 



Mazatlau, Guif of California, latitude 23° 20' K 



Guaymas, Gulf of California, latitude 28^" N. 



San Diego, California, latitude 33° 12' N. 



CLASS PELECYPODA. 

 1. Ostrea ? iridescens Gray. 



Two valves, probably of the above species ; subfossil. 

 Manta. 



2. Anoniia laiupe Gray. 



One junior with both valves perfect; seventeen of the left or imper- 

 forate valve, of various sizes and colors from silvery white to bright 

 orange. 



Payta. 



3. Spondylus princeps Brod. 



Two odd valves. 

 Panama. 



4. Pecteu ? tumbezensis Orbiguy. 



Three valves (25 to 27 ribs) ovate rather than circular in outline. 

 Probably Orbi guy's species. 

 Payta. 



5. Pecteu ventricosus Sby. 



-{-P. iumidus Sby. ^ I', inca Orb. C. B. Adams. 



Several odd valves easily referable to this species. 

 Payta; Panama. 



6. Pecten subnodosus Gray. 



Odd valves. 

 Mauta. 



7. Pecten purpuratus Lara. 



One large perfect valve. 

 Manta. 



