LOWER CHALK. 141 



The lower chalk, near Beachy Head, contains small cylindrical masses 

 of pyrites of a steel grey colour, that possess a very brilhant lustre ; their 

 surface is generally invested with pyramidal crystals, having their solid 

 angles replaced by quadrangular planes. 



2. Green sandstone. Small portions of this substance, evidently of the 

 same nature as the chlorite sand, have been discovered in the chalk at 

 Southerham. 



Organic Kemains. 

 These correspond in most instances with the fossils of the upper 

 division ; but as they are comparatively of rare occurrence, it will be more 

 convenient to include them in the general description of the organic re- 

 mains of the chalk. We shall therefore confine ourselves, in this place, 

 to an enumeration of those which occur in the lower chalk of Sussex. 



1 . Wood ; very rare. 



2. Supposed juli of the larch. 



3. Ventriculites radiatus. The remains of this zoophyte are very 

 rare in the lower chalk, and generally consist of the stirps only. 



4. Ventriculites alcyonoides : rare. 



5. Choanites subrotutidus. 



6. Apiocrinites ellipticus. 



7. Conulus albogalerus. 



8. Cirrus depressus. 



9. perspectivus. 



10.* granulatus. 



1 1 . Ammonites varians : very rare. 



12.* Woollgari. 



IS.* catinus. 



14.* 7'usticus. 



15.* Lewesiensis. 



16.* Belemnite. 



17. Plagiostoma ^/'o^mar^2. VV»|»>.aV] /fw^ t 



