270 LONDON CLAY. 



23. V enericavdiia planicosta. Mm. Conch. Tab. 1. 



This shell is one of the most elegant of the genus. It is frequently 

 four or five inches wide; of an obliquely cordate form, and the surface is 

 divided by longitudinal sulci into about twenty broad flat costae. Speci- 

 mens from Grignon, sent me by M. Brongniart, are precisely similar to 

 the Sussex shells; and are only to be distinguished from them, by their 

 peculiar whiteness. 



24. Venericardia squamosa? (Lamarck). 



25. Sanguinolaria Holloivaysii. Min. Conch. Tab, clix. 



A thin, transversely ovate, elongated bivalve, having a striated surface. 

 The anterior side is much wider than the posterior. 



26. Venericardia acuticosta? (Lamarck). 



This shell is 1 inch wide, and 0*8 inch long, with 20 acute longitudinal 

 ribs ; the inner margin dentated. 



27. Pectunculus pulvinatus. 



28. Cardium semigranulatum. Min. Conch. Tab, cxliv. 

 asperulum? of Lamarck. 



29. Chama^//c«^a. (Brander.) Foss. Hant. figs. 84, 85, 



The Bracklesham specimens are much larger than Brander's figures; 

 but in other respects the resemblance is complete. The upper valve is 

 nearly flat, and marked concentrically by the lines of growth; the lower 

 one is convex, and deeply fiu-rowed by longitudinal sulci. 



50. Chama lamellosa. (Lamarck). Foss. Hant. fig. 86. 



This species is subrotund, the surface marked with transverse concen- 

 tric sulci; the lower valve very convex. It was found by Mr. Kollo. 



51. Crassatella lamellosa. (Lamarck). Foss. Hant. fig. 89. 



An elegant equivalve shell, of an irregular ovate form, with numerous, 

 transverse, undulating sulci ; the anterior slope produced, and angular ; the 

 margin crenulated ; collected by Mr. Hollo. 



52. Ostrea. A shell of this genus, but too imperfect to admit of spe- 

 cification. 



33. Palate of a fish of the ray kind resembling fig. 117. Foss. Hant. 



