SEQUENCE OF THE GENEEA. 



Aspergillum, 1, 335 



Clavagella, 2, 335 



Fistulana, 3, 335 



Septaria, 3 



Teredo, 3, 335 



Pholas, 5 



Xylophaga, 9, 336 



Gastrochsena, 10, 336 



Solen, 11, 336 



Glauconome, 17, 337 



Solenella, 17, 337 



Panopsea, 18, 337 



Glycimeris, 18 



Pholadomya, 18, 337 



Mya, 19, 338 



Anatina, 20, 338, 339 



Periploma, 21, 339 



Neaera, 338 



Myodora, 338 



Thracia, 21, 339 



Lyonsia ( = Osteodesma), 24, 



339 

 Anatinella, 338 

 Lutraria, 26, 339 



Mactra, 38, 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 

 Amphidesina, 41, 341 

 Cumingia, 42, 343 

 Corbula, 45, 344 

 Pandora, 48, 345 

 Myochama, 48, 345 

 Saxicava, 50, 345 (and as 



Hiatella, 150) 

 Petricola, 51, 346 

 Venerupis, 54, 346 

 Sanguinolaria, 55, 346 

 Psammobia, 56, 346 

 Galeomma, 59, 346 



