Classification of the Brachiopoda. — Sehiiehert. 161 
GEOLOGICAL DISTRIBUTION OF THE BRACHIO- 
PODA. 
Pal.eozoic. 
Mesozoic. 
CjENOZOIC. 
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Fam. Paterinid^. 
Paterina, Beecher. 

Fam. Obolid.*. 
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Obolella, BilliiiKs. 
Elkania, Ford. 
Neobolu.'<, Waagen. 
■Obolus, Eichwald. 

? Spondyloboliis, McCoy. 
Fam. Trimerellid.e. 
^_ 
__ 
? Lakmina, (Ehlert. 
Dinobolus, Hall. 
Monomorella, Billings. 
Trimerella, Billings. 
Khynobolus, Hall. 

Fam. LiNGULEi.i.ii).*:. 
^_ 
^^ 
Lingulella, Salter. 

Lingulepis, Hall. 
Leptobolus, Hall. 

• 
Paterula, Barrande. 

? Mickwitzia, Schmidt. 

Fam. LiNGUi.iD.'E. 
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Lingiila, Brugnic-re. 
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Glossina, Phillii)s. 

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Dignomia, Hall. 

■Glottidia, Dall. 
^^ 
Barroisella, Hall. 

Thomasiua, Hall. 
Fam. LlN(iUL.^SMATID.-E. 
Xingulops, Hall. 
^•^ 
^mm 
liingulasma, Ulricli. 


Fam. Trematid.k. 
___ 
^^ 
__ 
^^^ 
^^ 
Discinolepis, W'aagen. 

TriMiiatis. Sharp!'. 

Schi/.oinmia, Hall <V: Whitf. 

^^^^ 
Schizoboliis Ulricli. 
(Ehlertella, llall. 

^^ 
'' Monoljolina, SaltPr. 
— 
Fam. DisciNiD.f:. 
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Orbiciiloidca, d'Orhiirnv. 

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•Scliizotri'ta, Kiitorga. 
^^ 
IJiidstni'inelia, Hall. 
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RdMUMvlla, Hall. 
__ 
Discina, Lamarck. 
— ^ 

DlBcinisca, Dall. 


Fam. ACROTRETID^.. 
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^ 
Iphidea, Billing^. 
__ 
Acrothde, Linnarsson. 

LiimarsKonia, Walcott. 
^_ 
Discinopsis (.Matthew), Hall. 

Acrotreta, Kiitorga. 

^^_ 
•Conotrcta, Walcott. 
— 
