the Neighbourhood of Lisbon. 



113 



Other localities where they have been found are marked against them. It will be 

 observed that there are more of the shells of Bordeaux than of any other locahty, 

 but not sufficient to identify the two deposits. 



Vermilia triquetra, Lam. Recent and Crag. 

 Lucina columbella, Sast. Bordeaux. 

 Lutraria sanna, JBast. Bordeaux. 

 Cyprina aequalis ? Mt7i. Con. Crag. 

 Cytheraea incrassata, Desk. Paris Basin. 

 Venus Brocchii, Bronn. Subapennines. 

 Cardiuni hians, Brocchi. Subapennines. 



paucicostatum, Sow. Conch. Illust. Recent. 



niulticostatum, Bast. Bordeaux. 



Panopaea Faujasii. Crag. 

 Solen antiquatus ? Recent. 

 Pectunculus pulvinatus. Paris Basin. 

 Pinna affinis, Min. Con. London Clay. 

 Spondylus quinquecostatus, Desh. The Morea. 

 Anomia ephippiuin, Goldf. Subapennines. 

 Ostreea flabellulum, Min. Con. London Clay. 



Boblayi, Desh. The Morea. 



longirostris, Goldf. Saxony and Andalusia. 



hyotis, Linn. Recent. 



Pecten maximus, var. ? Lain. Recent. 



squamulosus, Desh. The Morea. 



Pandora, Desh. The Morea. 



Natica glaucina, Lam. The Morea. 



Natica clausa, Sowb. Recent. 

 Ampullaria perusta ? Desh. Vicenza. 

 Sigaretus canaliculatus, Bast. London Clay and 



Bordeaux. 

 Turritella proto — , Bast. Bordeaux. 



cathedralis, Bast. Bordeaux. 



terebralis, Bast. Bordeaux. 



turris, D' Orb. Bordeaux. 



imbricataria ? Paris Basin. 



Solarium neglectum, Bellardi. Piedmont. 

 Phorus agglutinans. London Clay. 

 Pleurotoma raniosa, Brocchi. Subapennines. 

 Pyrula ventricosa ? Recent. 



condita, Brongn. Vicenza. 



rusticula, Bast. Bordeaux. 



Fasciolaria Burdigalensis, Bast. Bordeaux. 

 Murex trunculus, Linn. Recent. 



Ranella marginata, Brocchi. Recent and Sub- 

 apennines. 

 Eburna spirata? Lam. Recent. 

 Buccinuni veneris, Bast. Bordeaux. 

 Cassis Thesei, Brongn. Vicenza. 



Some papers laid before the Society by Colonel Silvertop (Proceedings, vol. i. pp. 

 216, 234 and 485, and vol. ii. p. 80), afford the means of comparing the tertiary 

 basin of the Tagus with those of the South of Spain. The marine deposits of 

 Alhama, Lorca, Baza, etc., coincide with the Almada beds ; as they contain in 

 great abundance the Ostraa longirostris, which is one of the commonest shells at 

 Almada, and a Pecten resembling the P. pleuronectes , but which Mr. George 

 Sowerby considers a distinct species, and which is not uncommon in the cliffs at 

 Almada. From some observations I made in crossing those parts of Murcia, I 

 had considered the deposits of Alhama, etc., equivalent to the Almada beds, and 

 Col. Silvertop's memoirs confirm that opinion. 



3. Lower Tertiary Conglomerate. (PI. XIV. and PI. XV. Sect. 1, 3, 6 to 8.) 



The oldest tertiary beds near Lisbon consist of a variety of distinctly stratified 

 conglomerates, underlying the calcareous beds of the Almada formation. They 

 are of limited extent, but vary very much in character ; yet as they attain a con- 

 siderable thickness, and agree in having all been formed during a period when a 

 violent and extensive denudation of the older rocks was going on, they seem to 

 deserve to be considered as a distinct formation. 



The principal deposit of these rocks may be traced bounding the Almada beds 

 from Alverca and Verdelha through Vialonga and Tojal to Loures, where it ex- 



VOL. VI. SECOND SERIES. Q 



