46 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Apr. 6, 



Pecten articulatus, Sckloth. 

 Lima gibbosa, Sow. 



bellula, Lye. 



Avicula digitata, Deslong. 



ornata, Goldf. 



Perna rugosa, Goldf. 

 Gervillia pernoides, Deslong. 

 Astarte subtrigona, Goldf. 



rhomboidalis, Phil. 



rugulosa, Lye. 



Ceromya striata, Sow. 

 Homomya gibbosa, Sow. 

 Pholadomya Heraulti, Ag. 

 media, Ag. 



Pleurornya elongata, Ag. 

 Gresslya abducta? Phil. 

 Goniomya angulifera ? Sow. 

 Terebratula globata, Sow. 



carinata, Lamh. 



Bhynchonella spinosa, Schloth. 



angulata ? Sow. 



Clypeus Plotii, Klein. 



Hugii, Ag. 



Echinobrissus clunicularis, Lhwyd. 

 Holectypus depressus, Lamk. 



hemisphsericus, Besor. 



Pedina rotata, Wright. 

 StoHiechinus intermedins, Ag. 



Fossils of B. Orypliite-grit. 



Gryphaea snblobata, Desh. 

 Pholadomya Heraulti, Ag. 



- media, Ag. 



ovulum, Ag. 



Trigonia striata, Sow. 

 Myopsis dilata, Phil. 



Fossils of C. 



Ammonites Sowerbii, Miller. 

 Troeliotoma carinata, Lye. 

 Natica adducta, Phil. 

 Monodonta laevigata, Sow. 

 Turbo Etheridgii, Lye. 

 Ostrea flabelloides, Lamk. 



gregaria, Sow. 



rugosa, Goldf. 



Gryphsea sublobata, Desk. 

 Perna rugosa, Goldf 

 Pecten lens, Sow. 



demissus, Phil. 



articulatus, Schloth. 



personatus, Goldf. 



Modiola plicata, Sow. 



gibbosa, Sow. 



Mytilus curtansatus, Lye. 



Pleurornya Goldfussi, Lye. 

 Lima compressa, Wr., n. sp. 

 Pecten spathulatus, Quenst. 

 Goniomya angulifera, Sow. 

 Khynchonella, sp. 

 Thecidium triangulare, d' Orb. 



Lower Trigonia-grit. 



Mytilus tumidus, Lye. 

 Pinna cuneata, Phil. 

 Trichites undulatus, Lye. 

 Gervillia Hartmanni, Goldf 



tortuosa, Phil. 



prselonga, Lye. sp. n. 



Lima proboscidea, Sow. 



bellula, Lye. S( Mor. 



gibbosa, Sow. 



punctata, Phil. 



Cucullaea oblonga, Sow. 

 Macrodon Hirsonensis, d'Arch. 

 Tancredia donaciformis, Lye. 

 Quenstedtia oblita, Mor. Sf Lye. 

 Corbicella compressiuscula, Lye. 

 ■ — tumidula, Lye. 



B. The Parkinsoni-zone at Dundry has been already described 

 (p. 24) in connexion with the Hnmphriesianus-beds, treated of in 

 detail (p. 23). 



nuated posteriorly ; the umbones are obtuse, not recurved ; the anterior side is 

 very convex and short, but rounded ; the area is very narrow, flattened, nearly 

 straight and smooth, traversed by an oblique mesial furrow, and sloping obliquely 

 downwards ; the marginal keel is distinct, but small, and nearly straight. The 

 costas are few in number (about eight), little elevated, but distinctly tuberculated 

 throughout their course ; their direction upon both sides is obliquely downwards, 

 so that they meet at an obtuse angle near to the middle of the valve. The size 

 of the costse does not differ materially at their two extremities ; therefore they 

 do not form the elegant undulation seen in T. angulata, nor the acute angle of 

 T. V-costata. A comparison of these features with the figure of the T. angu- 

 lata given in the ' Mineral Conchology ' will show that the latter shell has mesial 

 recurved umbones, and an excavated posterior area ; that the costae do not form 

 regular tubercles, and that they become large and prominent at their posterior 

 imdulation : altogether, Sowerby's species is a much more elegant shell.— J. L. 



