FORAMINIFERA 499 



Genus Verneuilina d'Orbigny (Fig. 210, d) 



Aperture typically with a tooth, test becoming conical in higher 

 forms; fossil and recent Family 13 Valvulinidae 



Genus Valvulina d'Orbigny (Fig. 210, e) 



Test with whole body labyrinthic, large, flattened, or cylindrical; 

 recent Family 14 Neusinidae 



Genus Neusina Goes 



Test trochoid at least while young 



Mostly free, typically trochoid throughout; fossil and recent. . 

 Family 15 Trochamminidae 



Genus Trochammina Parker and Jones (Fig. 210,/) 



Attached; young trochoid, later stages variously formed; fossil and 

 recent Family 16 Placopsilinidae 



Genus Placopsilina d'Orbigny (Fig. 210, g) 



Free; conical, mostly of large size; fossil only 



Family 17 Orbitolinidae 



Genus Tetrataxis Ehrenberg (Fig. 210, h) 



Test coiled in varying planes, wall imperforate, with arenaceous 



portion only on the exterior; fossil and recent 



Family 18 Miliolidae (in part) 



Genus Spiroloculina d'Orbigny (Fig. 210, i) 



Test calcareous, imperforate, porcellaneous 



Test with chambers coiled in varying planes, at least in young; aperture 

 large, toothed; fossil and recent. .Family 18 Miliolidae (in part) 



Genus Triloculina d'Orbigny (Fig. 210, j) 



Test trochoid; fossil and recent Family 19 Fischerinidae 



Genus Fischerina Terquem (Fig. 210, k) 



Test planispiral at least in young 



Axis very short, chambers usually simple; fossil and recent 



Family 20 Ophthalmidiidae 



Genus Vertebralina d'Orbigny (Fig. 210, I) 



Axis short, test typically compressed and often discoid, chambers 



mostly with many chamberlets; fossil and recent 



Family 21 Peneroplidae 



Genus Peneroplis Montfort (Figs. 4; 211) 



Axis typically elongate, chamberlets developed; mainly fossil 



Family 22 Alveolinellidae 



