580 HISTORY OF SYSTEMS. 



Order III. Foraminiferes, D'Orbigny. 



Fam. 1. Stichostegues, D'Orbigny. Genera — No- 

 dosaria, Frondicularia, Liiigulina, Rimulina, Vagi- 

 iiulina, Marginulina, Planularia, Pavonia. 



Fam. 2. Enallostegues, D'Orbigny. Genera — Bi- 

 generina, Textularia, Valvulina, Dimorphina, Poly- 

 morphina, Virgulina," Sphasroidina. 



Fam. 3. Helicostegues. Genera — Clavulina, Uvi- 

 gerina, Bilimina, Valvulina, Rosa lina, Rotalia, 

 Calcarina, Globigerina, Gyroidina, Trnncatulina, 

 Planulina, Operculina, Soldania, Cassidulina, Ano- 

 malina, Vertebralina, Polystomella, Dendritina, Pe- 

 neroplis, Spirolina, Robulina, Cristellaria, Nonio- 

 nina, Nummulina, Siderolina. 



Fam. 4. Agathistegues, D'Orbigny. Genera — 

 Biloculina, Spiroloculina, Triloculina, Articulina, 

 Quinqueloculina, Adelosina. 



Fam. 5. Enthomostegues, D'Orbigny. Genera — 

 Ampliistegina, Heterostegina, Orbiculina, Alveo- 

 lina, Fabularia. 



Class PTEROPODES, Cuvier. 



Fam. 1. Hyales, Ferussac. Genera — Cymbulia, 

 Limacina, Hyalea, Cleodora, Cuvieria, Euribia, 

 Psyche. 



Fam. 2. Clios, Ferussac. Genera — Clio, Pneumo- 

 derma. 



Class GASTEROPODES, Cuvier. 



Order I. Nucleobranches, Blainville. 



Fam. 1. FiROLiDES, Rang. Genera — Firola, Carin- 



aria. 

 Fam. 2. Atlantides, Rang. Genus — Atlanta. 

 Order II. Nudibranches, Cuvier. 



Fam. 1. Pterosomes, Rang. Genns — Ptcrosoma. 

 Fam. 2. Glaugues, Ferussac. Genera — Glaucus, 



Laniogerus, Briarsea, Eolidia, Tergipes. 

 Fam. 3. Tritoniens, Ferussac. Genera — Thethys, 



Melibe, Scyllaea, Tritonia. 

 Fam. 4. Les Doris, Ferussac. Genera — Polycera, 



Doris, Oncbidoris. 

 Fam. 5. Placobranches, Rang. Genus — Placo- 



branchus. 

 Order III. Inferobranches, Cuvier. 



Fam. 1. Phyllidiens, Lamarck. Genera — Pliylli- 



dia, Diphyllidia. 



