140 GUIDE TO THE EOSfSIL INVERTEBRATE ANIMALS. 
Gallery J. E. Lee, and have been described l)y the Lev. G. F. Whid- 
borne in the IMonographs of the Falaeontographical Society. 
Here are most of the genera already observed in tlie Carboni- 
ferous series. Among lamellibranchs Cardiola retrostriatci is 
important to the stratigrapher. 
Table-case Silurian. The Ludlovian Age is represented by fossils 
from Ledbury, Ludlow, and Kendal, the Wenlockian by 
fossils from Dudley and Benthall Edge, the Valentian by a 
few Bellerophons from the Llandovery beds. In addition to 
the I’alaeozoic genera already mentioned, one may see here 
rtcrinaea (Fig. 75 h), Orthonota, and Grani7ni/sia among the 
common lamellibranchs. The gastropods include numerous 
forms allied to Euom'phalus, one of them, Foh/tropina, 
preser\ ing the operculum, also the slightly curved Eccnliom- 
phalus, and Trnnatonohis (Fig. 75/), the “ piercc'd back” 
ally of Bellerophon. The Amphineura are re})resented by 
Ifelmin/hochiton. 
Fig. 75. — Lower Palaeozoic Lamellibranchs and Gastropods, fl, Cardiola 
intcrrnpta ; b, Pterinsea Danbyi ; c, Bcllerophon cambriensis, a recon- 
structed side view; d, Plalyccras \^Acroculia'] haliotis ; c, Maclurea 
Logani, the tjme-specimen ; /, Trematonotus dilatatns. a, b,d, and /, 
are Silurian from the Wenlock beds of Dudley; c is Ordovician, hoin 
the lower Llandeilo of Ayrshire; c, Cambrian, from the Upper hestimog 
beds of Dolgelly. a and c are nat. size; b, d, e, f, natural size. 
(Table-case IG.) 
Table-case Ordovician. The rocks of this Epoch, formerly classed 
16. as Lower Silurian, have furnished molluscan fossils from the 
Caradoc, Llandeilo, and Arenig divisions. Hiose e.xhibited 
