290 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



Table IV. (continued). 





Cor. 



Red. 



Re. 



cent. 



67 Tiirritplla inoras^sata SoWm ••.•• •••• 



* 

 * 



• 



* 

 * 

 * 



* 



* 



* 



* 



* 

 * 

 * 



* 



* 

 * 

 * 



* 

 * 

 * 



* 



• 

 * 



« 

 * 



* 

 * 



* 



68 Natira rirriforniis Sow» «••••••••••■«•»• •«■• 











72. Sowerbvi. Nvst 







* 

 * 



* 



/A. .^.^.^i. pvlin/lmpon 'Povm. --.- 



7/i limippllQTiJi iiTYilnlipfivi^ Tivncn^. . ^» 



76 ■ . rnvonafa Scncchi •••••••••••«••••• • 



C. varicosa, Phil. 



78. — ^— contrarius Gmel 



79, clathratus?. Lflmyt 



* 







Murex muricatus, Mont. 

 82. Pleurotoma intorta, Brocc 





83. turricula, Brocc 





84. Rostellaria nes Beliraiii Linn 



* 

 * 



85. Buccinum Dalei Sow. 



B. crassum, Nyst. 

 86. '— — ^ flexiiosum ?. Brocc 



87. ""• — elegans Sow. 





88. — — — reticosum. Sow 







* 



B. tenerum. Sow. 

 90. propinquum. Sow, .> 



91. labiosum. Sow 



* 

 * 

 * 

 * 



92. Cassidaria bicatenata, Sow 











n 



76 



46 



In the above list of 94 species it will be observed, by reference to 

 the first two columns, that all but four of them are common to the 

 Crag of Suffolk, and that 76 occur in the red crag, and 71 in the older 

 or coralline crag. The proportion of recent species, as given in the 

 third column, is 46, or nearly half of the whole, rather a smaller 

 proportion than in the yellow crag, as shown in Tables II. and III. 



3. Glauconiferous Crag or Crag Noir. Lower Antwerp Crag. — It 

 has hitherto been the opinion of the Belgian geologists that the glau- 

 coniferous crag, or the dark green shelly sand of Antwerp, was con- 

 siderably older than the two preceding groups, departing much far- 

 ther in its fauna from that of the existing seas, and containing many 

 shells common to older tertiary formations. 



When I submitted a small collection of specimens which I obtained 

 myself from this bed, consisting of the more abundant and therefore 



