2. CYRENA FLORIDANA, Conrad. 
Smithson. Monogr. 
Tampa bay. (Ex auctore.) 
Saracota bay. 
Boca Saca pass, Florida. 
c. Cvrena protexta, Conrad. Tampa bay. (Ex auctore.) 
3.8. CYRENA MEXICANA, Sowerby. 
Smithson. Monogr. 
San Blas. 
a. Panama. 
b. Mazatlan. 
c, Cvrena fragilis, Deshayes. Mazatlan. (Ex auctore.) 
d. Cvrena inæguilateralis, Deshayes. Mazatlan. (Ex auctore.) 
4. CYRENA OLIVACEA, Carpenter. 
Smithson. Monogr. 
Mazatlan. (Ex auctore, fide Cuming.) 
5... CYRENA GERMANA, Prime. 
Ann. N. Y. Lyceum VIII. 
Panaco river, near Tampico, Mexico. 
6, CYRENA TRIANGULA, v. d. Busch. 
Smithson. Monogr, 
Tamatico river, Mexico. 
