TABLE INDICATING THE GEOLOGICAE DISTRIBUTION OF THE BRACHIOPODA IN TIME. 
By Thomas Davidson, F.R.S., F.G.S., V. P. Pal. Soc., etc. 
Decade II. Vol. IV. 
GENERA. 
AUTHORS. 
DATE. 
FAMILIES. 
i 
1 
. 
3 
Jl 
«1 
►4 
u 
> 
Q 
< 
O 
£ 
H 
| 
0 
H 
1 « “ 
, 
Lingulella 
S alter 
l86l 
Lingulida 
| 
| 
2 
Lingidepis 
Hall 
1863 
id. 
«J 
3 
Monobolina 
S alter 
1857 
id. 
4 
Acrotreta 
Kutorga 
1828 
? Discinida 
5 
Acrot Ziele 
Linnarsson 
1875 
Discinida 
c 
6 
Iphidea 
id. 
1875 
? 
7 
Kutorgtna 
Billings 
l86l 
? 
8 
Obolella 
id 
1861 
Lingulida 
3 
__l 
9 
Orthiis 
Dalman 
1827 
Strophomen id<v .... 
Lingulida 
Q 
IO 
Lingula 
Bruguiere 
1789 
l 
1 
ii 
Discina 
Lamarck 
1819 
Discinida 
1 1 
1 1 
, 
12 
Obolus 
Eichwald 
1829 
Lingulida 
»3 
Siphonotreta _.. 
De Verneuil .... 
1S45 
? Dis ei ui da 
*4 
Trematis 
Sharpe 
1847 
Discinida 
15 
Porambomtes 
Pander 
1830 
Strophomenida .... 
16 
Eatonia 
Hall 
1857 
Rh ynchonellida.... 
? 
17 
Triplesia 
id 
1859 
18 
Coclospira 
id 
1863 
Spiriferida 
19 
Ltngulops 
id 
1871 
Lingulida 
20 
Dinobolus 
id 
1871 
Trtmerellida 
21 
Rhynobolus 
id 
1871 
id. 
22 
Eichwaldia 
Billings 
1858 
? 
2 3 
Stricklandima 
id. 
1859 
Rhytichonellidce 
? 
24 
Camerella 
id. 
1859 
2 5 
Trimerelia 
id. 
1862 
Tnmcrellida 
26 
Brachy prion 
Shaler 
1862 
Stroph omen ida 
27 
Brachymerus 
id. 
1865 
Rhynchonellida 
28 
Keiserlmgia 
Pander 
1860 
? 
2 9 
Helmersema 
id. 
1S60 
? 
30 
Schmidtia 
Volborth 
1868 
? Lingulida 
? 
3i 
Acritis 
id. 
1868 
3 2 
Volborthia 
Möller 
1874 
? 
33 
Anastrophia 
Hall 
1867 
Rhynchonellida 
34 
Meristma 
id 
1867 
Spiriferida 
35 
Rhynchotrema 
id 
? 
id. 
36 
Schizocrania 
id 
1875 
Discinida 
37 
Dicalosia 
Kl , n e 
1850 
Strophomenida 
3S 
Monomerelia .... 
Billings 
1871 
Tnmerellida 
39 
Leptoccdia 
Hall 
1857 
Rhynchondlida: 
40 
Rensselaria 
id 
1856 
Terebratulida 
4i 
Skenidium 
id 
1860 
? Strophomenida 
42 
Cryptonella 
id 
1861 
? 
1 
43 
Meristella 
id 
1860 
Spiriferidce 
44 
Zygospira 
id 
1862 
id. 
1 
45 
Pholidops 
id 
1S59 
Craniada 
46 
Cyriia 
Dalman 
1S27 
Spiriferida 
47 
Digtiomia 
Hall 
1871 
Lingulida 
48 
Spirfer ...„ 
Sowerby 
1S15 
Spiriferidce 
1 
49 
McCoy 
1844 
id. 
i i 1 
50 
Crania 
Rhynchonella 
Trematospira 
Retzius 
Fischer 
1781 
Craniada 
1 
5i 
1809 
Rhynchondlida 
1 
1 
5 2 
Hall 
D’Orbigny 
1S57 
Spinfcrida 
53 
Orthisina 
1849 
Strophomenida 
? 
? 
? 
54 
Merista 
Suess 
1851 
Spiriferida 
55 
Strophodonta 
Hall 
1852 
Strophomenida 
56 
Nucleospira 
id 
1857 
Spiriferida 
1 
57 
Rhynchosptra 
id 
1857 
id. 
58 
Atrypa 
Dalman 
1827 
id. 
59 
Pentamerus 
Sowerby 
1813 
Rhynchondlida 
60 
Strophomena 
Rafinesque 
1820? 
Strophomenida 
61 
Retzia 
King 
1850 
Spinferida 
.... 
1 
62 
Chonetcs 
Fischer 
1837 
Productida 
63 
Leptcena 
Dalman 
1827 
Strophomenida 
1 
64 
Terebratula 
Llhvvyd 
1699 
Terebratulida 
t 
6 5 
Megantheris 
Suess 
1855 
id. 
66 
Stringocephalus 
Defrance 
1828 
id. 
67 
Uncites 
id. 
1828 
Spiriferida 
? 
68 
Anaplotheca 
Sandberger 
1855 
69 
Davidsonia 
Bouchard 
1849 
? 
70 
Vetulina 
Hall 
1860 
? 
7i 
Tropidotepis 
id 
1857 
? Terebratulida 
72 
Centronella 
Billings 
1859 
? 
73 
Charionella 
id. 
1861 
Spiriferida 
74 
Pentamerelia 
Hall 
1867 
? Rhynchondlida 
75 
Ainphigena 
id 
1867 
? id. 
76 
Gyptdula 
id 
1867 
? id. 
77 
Ambocodia 
id. 
1860 
Spiriferida 
78 
Leiorhynchus 
id 
1860 
Rhynchonellida 
79 
Productella 
id 
1864 
Productida 
80 
Cyrtina 
Davidson 
1858 
Spiriferida ..a. 
81 
Productus 
Sowerby 
1814 
Productida 
1 
82 
Strophalosia 
Spiriftrina 
King 
1844 
id. 
1 
83 
D’Orbigny 
1847 
Spiriferida 
1 
84 
Martinia 
McCoy 
1844 
id. 
85 
Syntrielasma 
Meek 
1866 
? 
86 
Syrmgothyris 
Winchell 
1863 
Spiriferida 
87 
Aleekclla 
White 
1867 
Strophomenida 
? 
SS 
Cryptacanthia 
id. 
1867 
89 
Aulacorhynchus 
Dittmar 
1S71 
? 
90 
Eumelna 
Hall 
1S63 
Spiriferida 
91 
92 
Catnarophoria .... 
Streptorhynchus 
King 
King 
1844 
1850 
Rhynchonellida 
Strophomenida .... 
— 
93 
Dielasma 
King 
1S59 
94 
Aldosteges 
Helmersen 
1847 
Productida 
95 
Rhyuchopora 
King 
1862 
? Rhynchonellida 
96 
Thecidmm 
Dimerella 
Defrance 
1828 
Thecidida 
} 
1 
97 
1870 
Terebratulida 
98 
Amphidina ..... 
Laube 
1S65 
? 
99 
Konvtckuta 
Suess 
■853 
Spiriferida 
100 
Craniscus 
Dali 
1871 
Craniada 
, 
IOI 
Hyntiiphora 
Suess 
1855 
? 
102 
Zdlama 
Moore 
1S54 
Terebratulida 
103 
Suessia 
Deslongchamps .. 
1S54 
Spiriferida 
104 
Rhyiichonellina 
Gemellaro 
1871 
R hync honet lida 
105 
106 
Ismenia 
Waldhdmia 
King 
1850 
Terebratulida 
id 
D’Orbigny 
1850 
id. 
■°2 
Terebratulina 
1847 
id. 
Terebratella 
id. 
1S47 
td. 
109 
Argiope 
Deslongchamps .. 
1842 
id. 
HO 
Megerlia 
Kmg 
1850 
id. 
? 
III 
Craniops 
Dali 
1871 
Craniada 
1 1 2 
A tugina 
Davidson 
1852 
113 
Terebrirostra 
D’Orbigny 
1847 
id. 
114 
Magus 
Sowerby 
1S1S 
id. 
115 
I l6 
Cistella ..... 
ATannia 
Gray 
Dewalque 
1853 
1868 
id. 
id. 
? 
? 
1 17 
Laqueus 
Dali 
1870 
Lingulida 
11S 
Kraussma 
Davidson 
1852 
119 
Bouchardia 
id 
IS49 
id. ...» 
120 
Platidia 
Costa 
IS52 
id. 
121 
Magasella 
Dali 
1870 
id. 
122 
Discinisca 
id 
1871 
Discinida 
123 
Glotlidia 
id. 
1870 
Lingulida 
124 
Gwynia 
Kmg 
1859 
Terebratulida 
125 
Afacandrevia 
id 
1859 
id. 
126 
Atretia 
Jeffreys 
1871 
? 
It cannot be doubted that a certain number of these genera when better understood will require to be added to the synonyms. It will be 
so especially with some that appear founded more on specific than generic characters. The families to which several of the genera belong 
cannot yet be correctly determined. 
