86 



TaMe sliowing approximately the Tcnown distribution of tlie chief groups of BracMopoda in 

 geological time — Continued. 



Productus, Sowerby. , 

 Productella, Hall . . 

 Aulosteges, Helmersen , 



SlPHONOTEETIDiE. . . 



Acrotreta, Kutorga . . 

 Si^honotreta, Vernouil . 

 Mesotreta, Kutorga . . 

 Tolborthia, Moller . . 



Trimekellid^ . . 

 Trimerella, Billings 

 Dinobolus, Hall . . 

 Monomerella, Billings 

 ? Lingulops, Hall . 



Obolid^ ....... 



Spondyloholus, M'Coy . . . 

 Monobolina, Salter . . . . 



Kutorgina, Billings . . . 

 Obolella, Billings . . . . 



Obolus, Eiohwald . . . . 



Aulonotreta, Kutorga (pars). 

 Selmersenia, P.T,nder . . . 

 Kcyserlingia, Pander . . . 

 Dicellomus, Hall . . . . 



LlNGULID^ . . 

 Lingulella, Salter 

 lAngulepis, Hall . 

 Glossina, Phillips 

 Lingula, Brngi6ro 

 Dignomia, Hall . 

 Olottidia, Dall . 



DlSCINID^ 



Discinisea, Dall 



Schizocrania, Hall & "Whitfield 



