268 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 5, 



EXPLANATION OF PLATE XVL 



Fig. 1. Sanguinolaria Edvardsii, Morris. 

 Fig. 2. Glycimeris Rutupiensis, Morris. 

 Fig. 3. Panopsea granulata, Morris. 

 Fig. 4. Pholadomya Koninckii, Nyst. 

 Fig. 5. Cytherea orbicularis, Edwards. 

 Fig. 6. Astarte tenera, Morris. 

 Fig. 7. Leda substriata, Morris^ magnified. 

 Fig. 8 a. Pecten Prestvichii, Morris. 



Fig. 8 b. , portion magnified. 



Fig. 9. Scalaria Bowerbankii, Morris. 



Fig. 10. Trophon subnodosum, Morris. 



Fig. 11. Ovoidal bodies filling tubular cavity in sand (see p. 247). 



Fig. 12 G. Cristellaria platypleura, Jones, magnified. 



Fig. 12 b. , edge view, magnified. 



Fig. 13 a. Rosalina Marias, Jones ; under surface, magnified. 



Fig. 13 5. , edge view, magnified. 



Fig. 1 4 a. Polymorphina ampulla, Jones, magnified. 



Fig. 14 b. , seen from above, magnified. 



May 5, 1852. 



Capt. R. M. Westmacott was elected a Fellow. 



The following communications were read : — 



1. On the Tertiary Formations of Belgium and French 

 Flanders. Part I. The Pliocene, Miocene, and Upper 

 Eocene. By Sir C. Lyell, F.R.S., V.P.G.S. 



[This will be printed with Part II. " On the Lower Tertiaries of Belgium," 

 read May 19, 1852.] 



2. On the Geology of Catalonia. By S. P. Pratt, Esq., F.R.S., 



F.G.S. &c. 



The general aspect of the Spanish Province of Catalonia is a series 

 of hills, which take a direction from the north-east to the south-west, 

 nearly parallel to the coast ; they are separated from each other by 

 undulating plains or valleys of nearly the same width as the ridges, 

 varying from five to twelve miles. These hills occasionally rise to a 

 considerable elevation, from 2000 to 3000 feet. As great disturbance 

 has taken place near the chain of the Pyrenees, these parallel ridges 

 do not assume their predominant character nearer than about twenty 

 miles from the base of these mountains ; but ev^en beyond this 

 distance, they are considerably disturbed here and there throughout 

 their extent by igneous action and the protrusion of masses of granite. 

 The pass of the Pyrenees by Bellegarde to Jonquera represents the 

 genera] character of several other ridges in the province, the base 

 being granite, covered by gneiss, and surmounted by very thick de- 

 posits of schistose beds, with occasional masses of limestone and red 

 marly sandstone. 



