952 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 37. 
ARCA ALTERNATA Sowerby. 
1833. Byssoarca alternata SOWERBY, Proc. Zool. Soc., p. 17.— 
REEVE, Con. Icon., A7ca, pl. 13, fig. 88, 1844. Panama to 
Ecuador. . Be 
ARCA GRADATA Broderip and Sowerby. 
1829. Zodl. Journ., vol. 4, p. 365.—RuEver, Con. Icon., Arca, 
pl. 14, fig. 92, 1844. Mazatlan, Mexico, to Iquique, Chile, 
ee and the Galapagos Islands. 
~ ARCA PUSILLA Sowerby. 
1833. Lyssoarca pusilla SowERBy, Proc. Zool. Soc., p. 18.— 
Reve, Con. Icon., Arca, pl. 16, fig. 112, 1844. Coast of 
Eeuador, and south to S. lat. 23° 37’. 
ARCA SOLIDA Sowerby. 
1833. Proc. Zool. Soc., p. 18.—ReExEvE, Con. Icon., Arca, pl. 16, 
fig. 106, 1844. Gulf of California, to Paita, Peru, and the. ) 
Galapagos Islands. | 
ARCA (BARBATIA) BIANGULATA Sowerby. 
1833. Arca biangulata SOWERBY, Proc. Zool. Soc., p. 21. Guaya- 
quil. 
ARCA (BARBATIA) DECUSSATA Sowerby. 
1833. Byssoarca decussata SOWERBY, Proc. Zool. Soc., p. 18.— 
REEVE, Con. Icon., Arca, pl. 12, fig. 81, 1844. Galapagos 
Islands. 
ARCA (BARBATIA) LITHODOMUS Sowerby. 
1833. Lyssoarca lithodomus SOWERBY, Proc. Zool. Soc., p. 16.— 
REEVE, Con. Icon., Arca, pl. 12, fig. 76, 1844. (Barbatia 
grown in a Lithodomus burrow?) Monte Cristi, Ecuador. %@: 
ARCA (BARBATIA) LURIDA Sowerby. a 
1833.  Byssoarca lurida SowxErRsy, Proc. Zool. Soc., p. 19.— 
ReEve#, Con. Icon., Arca, pl. 14, fig. 95,1844. Santa Elena, 
Guayaguil. 
ARCA (BARBATIA) REEVIANA Orbigny. 
1846. Arca reeviana OrBieny, Voy. Am. Mér., p. 635.—Arca 
helblingt Rrnvey, Con. Icon., Arca, pl. 14, fig. 90, 1844; not 
of BrueurérE, 1789. From Manta, Ecuador, south to Paita, 
Peru. Mazatlan, Diawec. 
ARCA (BARBATIA)\ VELATA Sowerby. 
1833. Byssoarca velata SOWERBY, Proc. Zool. Soc., p. 18.— 
ReeEv#, Con. Icon., Avca, fig. 79, 1844. Indo-Pacific. Peru 
(Tschudi). 
ARCA (CUCULLARIA) PLATEI Stempell. 
1899. Area(Barbatia) platei STEMPELL, Fauna Chilensis, vol. 2, 
p. 220, pl. 12, figs. 10-12. Juan Fernandez Island. 
ARCA (SCAPHARCA) AVICULOIDES Reeve. 
1844. Arca aviculoides RnnveE, Con. Icon., Arca, pl. 10, fig. 63 
(and pl. 6, fig. 85 as A. auriculata SowERBY, not LAMARCK). 
Panama to Guayaquil. 
