INDEX. j^y 



Order I.-ACEPHALA TESTACEA— (continued). 



Rudista, 83 

 Radiolites, 83 

 Sphgerulites, 84 

 Calccola. 84 

 Hippurites, 84 

 Batollthes, 84 

 Ostrea, 84 



Ostrea proper, 84 

 Peloris, 84 

 Gryphaea, 85 

 Pectens, 85 

 Lima, 86 

 Pedum, 86 

 Hinnita, 86 

 Plagiostoma, 87 

 Pachytes, 87 

 Dianchora, 87 

 Podopsis, 87 

 Anomia, 87 



Echion, 87 

 Placuna, 88 

 Spondylus, 88 



Plicatula, 88 

 Malleus,88 

 Vulsella, 89 

 Perna, 89 



Crenatula, 89 

 Gervilia, 89 

 Inoceramus, 90 

 Castillus, 90 

 Pulvinites, 90 

 Etheria, 90 

 Avicula, 90 



PintadinjK, 90 

 Margaritse, 90 

 Pinna, 91 



Chimsera, 91 

 Area, 91 



Area proper, 92 

 CucuUaea, 92 

 Pectunculus, 92 

 Aximea, 92 



Nucula, 92 ) 



Trigonia, 93 ' 



Fam. 2. — Mytilacea, 93 

 Mytilus, 93 



Mytilus proper, 93 

 Modiolus, 94 

 Lithodomus, 94 



