436 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Siphonium centiquadra Valenciennes. 
Turritella goniostoma banksii Reeve. 
Cerithium uncinatum Gmelin.. Taboguilla Id. 
Cerithium stercus-muscarum Valenciennes. Taboguilla Id. 
Cerithium maculosum Kiener. Taboguilla Id. 
Cerithiopsis neglecta C. B. Adams. Perico Id. 
Triforis panamensis Bartsch. 
Planaxis planaxis Wood. Taboguilla Id. 
Rissoina fortis C. B. Adams. Perico Id. Taboguilla Id. 
Crepidula onyx Sowerby. 
Cypraea exanthema Linné. 
Cypraea punctulata Gray. 
Cypraea arabicula Lamarck. 
Cypraea (Pustularia) pustula Swainson. 
Acmaea fascicularis Menke. Perico Id. Taboguilla Id. 
Nerita scabricosta Lamarck. 
Nerita bernhardi Recluz. Perico Id. Taboguilla Id. 
Chlorostoma inerme Gmelin. 
Omphalius reticulatus Gray. 
Fissurella mexicana Sowerby. Taboguilla Id. _ 
Fissurella nigropunctata Sowerby. Taboguilla Id. 
Chiton stokesii Broderip. Taboguilla Id. 
Ischnochiton pectinulatus Carpenter. Taboguilla Id. 
Ischnochiton ophioderma Dall. Perico Id. 
Callistochiton periconis Dall. Perico Id. 
Mytilus multiformis Carpenter. Taboguilla Id. 
Myoforceps attenuatus Deshayes. Perico Id. 
Melina chemnitziana Orbigny. Taboguilla Id. Perico Id. 
Margaritiphora fimbriata Dunker. Taboguilla Id. 
Lima angustata Reeve. Perico Id. 
Anomia lampe Gray. 
Arca mutabilis Sowerby. Taboguilla Id. 
Arca illota Sowerby. Taboguilla Id. 
Arca alternata Sowerby. Taboguilla Id. 
Carditamera affinis Broderip. Perico Id. 
Chama buddiana C. B. Adams. Taboguilla Id. 
Protothaca grata Say. Taboguilla Id. 
Kellia suborbicularis Montagu. Taboguilla Id. 
SHORE SHELLS FROM Cocos IsLAND. 
Melampus panamensis C. B. Adams. 
Siphonaria gigas Sowerby. 
Mitra lens Wood. 
Latirus tuberculatus Broderip. 
Murex humilis Broderip. 
Thais melones Duclos. 
Thais patula Linné. 
