INDEX. 



ORDER I. ACEPHALA TESTACEA (continued). 



Rucjista, 83 



Radiolites, 83 



Sphaerulites, 84 



Calccola, 84 



Hippurites, 84 



Batolithes, 84 

 Ostrca, 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 



Jnoceramus, 90 



Castillus, 90 



Pulvinites, 90 

 Etheria, 90 

 Avicula, 90 



Pintadina?, 90 



Margarita?, 90 

 Pinna, 91 



Chimaera, 91 

 Area, 91 



Area proper, 92 



Cucullaea, 92 



Pectunculus, 92 



Aximea, 92 



Nucula, 92 

 Trigonia, 93 



Fam. 2. MYTILACEA, 93 

 Mytilus, 93 



Mytilus proper, 93 



Modiolus, 94 



Lithodomus, 94 



