group

II-XV.

Prionodesmacea and Anomalodesmacea

XVI-XVII. Astartacea, Carditacea, Chamacea

XVIII-XXIII. Lucinacea, Leptonacea, Cardiacea

XXIV-XXVIII. Veneracea

XXIX-XXXVI. Tellinacea, Solenacea, Mactracea, Myacea, Molluscoidea

XXXVII-XLVIII. Pteropoda, Opisthobranchia, and Ctenobranchia (in part)

XLIX-LI. Stenoglossa (in part)

LII-LXII. Ctenobranchia (remainder), Aspidobranchia, Scaphopoda

65-79

97-99

143-149

179-184

241-249

423-435

487-490

639-650

U.S. GOVERNMENT PRINTING OFFICE: 1947-695462