408 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 26, 



Species. 



Synonyms. 



Venericardia planicosta, Lam. 



Suessonensis, B'Jrchiac 

 Vermetus Bognoriensis, Soiv.. 

 Voluta ambigua, Soiv 



augusta, Desk 



athleta, Soiv 



bicorona, Lam 



bulbula, La7n 



cythara, Lam 



costata, Sow 



deniidata, Sow 



depauperata, Sow 



elevata, Sow. 



geininata, Soiv 



harpula, Zflm 



labrella, Lam , 



lima, Soiv , 



luctatrix, Sow , 



majorum, Soiv 



muricina, Lam 



nodosa, Soiv 



protensa. Sow 



scalaris, Sow 



simplex, Desh 



spinosa, Lam 



suspensa, Soiv 



tricoroua, Sow 



Wetherellii, Sow 



Volvaria acutiuscula. Sow 



Vulsella deperdita, Desh 



Xiphidion quadratum, Sow 



V. digitalina, Lam. 

 V. musicalis, Lam... 



Pollicipes qiiadratus 



DESCRIPTION OF PLATE XIV. 



Comparative Sections. — Intliese sections the superposition and thickness of the 

 strata have been proved either in natural sections, wells, or railway cuttings. The 

 lines connecting the sections show the presumed range of the strata they subtend. 

 They have no reference to the surface level. \Vliere the connexion is not com- 

 pleted, there is a doubt as to their probable course. In the liorizontal scale the 

 sections are merely placed at their relative geographical distances. 



Point a, tigs. 1 and 2, shovfs the base of the Barton clays. The junction beds 

 in both sections exhibit like characters. 



Point /3, figs. 3 to 10, gives the range of the Venericardia planicosta, Turritella 

 sulcifera and Nummulites Icevigatus — typical fossils of the central beds of the 

 Bracklesham Bay series. 



At Point y, fig. 2, is the thin stratum of light-coloured laminated clays full of 

 very distinct vegetable impressions. In fig. 1. I have shown at y the probable po- 

 sition of the Bournemouth strata in which similar impressions have been found. 



Point b is at the base of the London clay at those places where we have found 

 the structure to correspond, and where tlie lowermost stratum abounds with Pcc- 

 tunculus brevirostris, Ditrupa plana, Cytherea oUiqua, Pinna affinis, Panipcea 

 intermedia, liostellaria Sowerhii, &c. and teeth of Lamnce. 



Point 6 exhibits the position of the baud of Ostrea bellovacina. 



