154 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 21, 



Astarte discus, u. s. Ostraea pustnlosa, n. s. 



Cardium dissimile, Sow. Pecten Lusitanicus, n. s. 



Corbula Edwardi, n. s. Perna Lusitanica, n. s. 



Cyprina securiformis, n. s. rugosa, Goldfuss. 



Gervilia aviculoides, Sow. Tellina Sobralensis, n. s. 



Fittoni, n. s. Trigonia Lusitanica, n. s. 



Sobralensis, n. s. • muricata, Goldfuss, sp. 



Mytilus Morrisii, n. s. 



The same gentleman sent me a fine specimen of Sph<Era corrugata 

 of Sowerby, from tlie sandstones of the same neighbourhood ; this 

 species has been republished by M. d'Orbigny under the name of 

 Cordis cordiformis : it is a most characteristic shell of our greensand. 

 The Portuguese specimen differs shghtly in wanting the faint radia- 

 ting lines seen on the English and French specimens, but is otherwise 

 undistinguishable : this trifling difference will not constitute it a new 

 species, as those lines vary much in our specimens. 



Between Enxarra dos Cayalheiros and San Sebastian, in beds pro- 

 bably belonging to nearly the same part of the series, I foimd on a 

 former excursion 



Trigonia muricata, Goldfuss, sp. Perna Lusitanica, n. s. 



The species in the aboye hsts are so different from those found in 

 the calcareous beds north of Cintra (p. 151), the only common species 

 being Xatica prcelonga, that they show that the beds of the two lo- 

 cahties belong to very different positions in the subcretaceous series. 



From Refiigidos through Alenquer to the northward, the section 

 No. 5 (fig. 6) crosses the beds, just described, in the ascending order, 

 dipping to the opposite direction of E.N.E. at angles varying from 

 10° to 20° : I examined this part of the section m greater detail than 

 the former. For easier comparison let us begin at the east end of 

 the section and thus adhere to the descending order as before. The 

 uppermost bed seen on this hue is a loose sand in the valley of Cor- 

 regado, beyond which we cannot cany the series, as the subcretaceous 

 beds are lost to the eastward for some miles in a broad marsh which 

 probably conceals a line of fault. 



Sandstones and sand of a hght ferruginous colour, flanking the hills 

 north of Yilla Franca, lie next below the sands of Corregado, and are 

 succeeded by the following : — 



Coarse calcareous breccia, seen to the north of Alenquer. 



Sand and sandstone with beds of micaceous flagstone, on the north 

 side of Alenquer. 



Calcareous sandstone. 



Hard white compact hmestone. 



Calcareous conglomerate. 



Coarse coralline limestone containing also some shells : it caps the 

 hill of Alenquer. This is obviously the same bed as that crossed 

 on the former part of the section at Trancozo de cima, and hke 

 that is a true coral reef; it is perhaps 150 feet thick. 



Sand and sandstone, occasionally calcareous. 



Red and variegated marls. 



