the Calcaire Grassier of Paris. 5 



careous marls appear. These divide into fragments, the faces 

 of which are commonly covered by a yellow bloom and black 

 dendrites. They are divided by soft calcareous mai*ls, by 

 argillaceous marls, and by calcareous sand containing chert. 

 "We refer the bed in the Neuilly quarries to this system, in 

 which are found quartz crystals, rhomboidal crystals of car- 

 bonate of lime, and small cubical crystals of fluor spar. 



This fourth and last system contains very few shells : in fact 

 the upper beds do not usually contain any. 



Each of these systems may be characterized by the fossils 

 contained in the follow^ing list : 



First System. 



Lower Beds. 



^.-r T. 1 ■ . r These are always found in the lowest 



Jsummulites L(cvis;ata . i ^ ^u ^ ^^ j ^ 



,* \ parts : they are not discovered at 



scabra . . J r' ■ "Iv, /^ • .... 



, . < Lrngnon ; the Ui'isfnon strata an- 



numismaiis j .. i i .? ^ .1 • j 



. f J f ( pear to belong rather to the mid- 

 dle than the lowest beds. 



Madrepora Three species at least. 



Astrcea At least three species. 



7'urbinolia elliptica . . A. Br. 



crispa .... Lam. Enc. pi. cdlxxxiii. fig. 4. 



sulcata . . . Lam. 



Reteporitcs digitata . . Lam''., Polyp, pi. Ixxii. fig. 6 — 8. 

 Lunulites radiata . . . Lam^., Polyp, pi. Ixxiii. fig. 5 — 8. 



urceolata . . Lam. 



Fungia Guettardi . . . Gueltard, 3, pi. xii. fig. 1 — 8. 



^Scarcely any other than this species 

 Cerithium gigantcum . j of ceritJmnu is found in the true in- 



' ferior beds. 

 Lucina laviellosa. 

 Cardium poridosum. 

 Valuta Cithara, 

 Crassatella lumcllosa. 

 Turritella viultisulcaia. 

 Ost7ca Flabellula. 

 Cymbula. 



Sfxond System. 



Middle Beds. 



Nearly all the Grignon fossils belong to this system. The 

 following appear to be liic most characteristic : 

 Orhitolites plana. 

 Curdita avicularia. 

 Ovidites elongata, Lam. . . . Lam"., pi. Ixxi. fig. 11, 12. 



Omliics 



