SEQUENCE OF THE GENERA. 
Aspergillum, 1, 335 
Clavagella, 2, 335 
Fistulana, 3, 335 
Septaria, 3 
Teredo, 3, 335 
Pholas, 5 
Xylophaga, 9, 336 
Gastrocheena, 10, 336 
Solen, 11, 336 
Glauconome, 17, 3387 
Solenella, 17, 337 
Panopzea, 18, 337 
Glycimeris, 18 
Pholadomya, 18, 337 
Mya, 19, 338 
Anatina, 20, 338, 339 
Periploma, 21, 339 
Neera, 338 
Myodora, 338 
Thracia, 21, 339 
Lyonsia (== Osteodesma), 24, 
339 
Anatinella, 338 
Lutraria, 26, 339 


Mactra, 28, 340 
Mulinia, 34, 340 
Crassatella, 35, 340 
Gnathodon, 35, 340 
Mesodesma, 38, 341 
Ervilia, 343 
Erycina, 39, 341 
Ungulina, 40, 341 
Montacuta, 40 
Lepton, 340 
Kellia, 343 
Solemya, 41, 341 
Amphidesma, 41, 341 
Cumingia, 42, 343 
Corbula, 45, 344 
Pandora, 48, 345 
Myochama, 48, 345 
Saxicava, 50, 345 (and as 
Hiatella, 150) 
Petricola, 51, 3846 
Venerupis, 54, 346 
Sanguinolaria, 55, 346 
Psammobia, 56, 346 
Galeomma, 59, 346 
