8 Dr. Thomas Davidson—Scottish Silurian Brachiopoda. 
Genera and Species. 
Orthis Sowerbiana, Dav. ......... 
399 
9? 
39 
sagetttifera, M‘Coy ...... 
PELOSI AN SL BAe toto ncaa 
VUSTICD, SOW soc acceccaseet 
Actonie, Sow. ? 
FEUELSE, A OAteh, bates eee 
PVOLENSA, SOW. ..0.seeeeee. 
? Kelbucoensis, Dav...... 
Strophomena rhomboidatis, Dalm. 
29 
93 
99 
Leptena 
9? 
39 
- Resta 
Chonetes striatella, Dalman 
antiquata, SOW. ......... 
Walmstedti, Lindstrom.. 
DechereNeamne = 25... 5 a2 
applanata, Salter ......... 
Flendersont, Dav.......... 
LT ANDI SOWES bate: os 288 
alternata, Salter 
eercoesoes 
CXPAUSA SOW eee nee 
corrugatella, Dav.......... 
wmbrex,var. semiglobosine, 
Daly hh cee ee ae ee 
Llandeiloensis, Dav....... 
retrofiexa, Salter ........ 
Vialion2Z, Weave fated ee 
Shallockiensis, Dav. ...... 
deltoidea, Conrad ......... 
transversalis, Sow. ..... 
SEKICED, SOW tvonce en koce 
ts var. rhombica, 
M‘Co 
i i i i is 
eoenee 
guinguecostata, M‘Coy... 
segmentum, Angelin...... 
Youngiana, Dav. ......... 
LEithevidgé, Wavn...% 0. emer 
Llandeiloensis, Dav....... 
Grayz, Dav. .. 
scissa, M‘Coy 
pars 
ba 
Wenlock. 
iat & 
Llandovery. 
mo 
bdo 
x 
Caradoc, 
Llandeilo. 
ba 4 
ae 
x 
mM PM OM 
o 
Scottish Counties where 
found. 
Ayrshire, Peeblesshire. 
Ayrshire, 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire, Peeblesshire, 
Lanarkshire. 
Peeblesshire. 
Midlothian, Peebles- 
shire, Ayrshire. 
Midlothian, Ayrshire. 
Midlothian, Ayrshire. 
Midlothian, Ayrshire. 
Midlothian, Ayrshire. 
Midlothian. 
Dumfriesshire, Ayrshire 
Dumfriesshire, Peebles- 
shire, Ayrshire. 
Dumfriesshire, Lanark- 
shire, Ayrshire. 
Dumfriesshire, Ayrshire 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Midlothian, Ayrshire. 
Peeblesshire, Lanark- 
shire, Ayrshire, Kirk- 
cudbrightshire, Ber- 
wickshire, Dumfries- 
shire. ; 
Dumfriesshire, Ayrshire 
Dumfriesshire, Peebles- 
shire, Lanarkshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Ayrshire. 
Midlothian. 
the 154 so-termed Silurian species have been referred to about 26 
genera, and that about— 
64 species are recorded from the Llandeilo (including much of the Lower Caradoc 
of Murchison, Ramsay and Geikie). ? 
44 from the Lower, Middle, and Upper Caradoc (including beds from a little below 
the Caradoc Limestone to the base of the Lower Llandovery). 
47 from the Lower, Middle, and Upper Llandovery. 
8 from the Wenlock. 
28 from the Ludlow. 
