126 



THE LIAS AMMONITES. 



The fossils collected here show that the Serpentinuni- and Bifrons-he&^ are those divi- 

 sions of the Upper Lias which are best developed in Rutland, as the following list 

 demonstrates : 



Cephalopoda. 



Harpoceras serpentinutn, Rein. 



— bifrons, JBrug. 



— elegans, Sow. 



— falciferum, Sow. 



— radians, Rein. 

 Stephanoceras commune, Sow. 



Stephanoceras crassum, Phil. 



— Holandrei, d'Orb. 



— anuulatum. Sow. 

 Pliylloceras heterophyllum, Sow. 

 Belemuites compressus. Volts. 



— tenuis, Phill. 



Lamellibranchiata. 



Posidonomya Bronni, Voltz. 

 Nucula cordata, Gold/. 

 Astarte striatosulcata, Horn. 



Leda ovum, Sow. 



Inoeramus dubius, Sow. 



Ostrea subauricularis, d'Orb. I 



From the above list it appears that the Serpeniinum- and Bi/rons-beds are so blended 

 together in the Upper Lias of Rutlandshire that they have not yet been separated from 

 each other, and that these two lower zones of the Upper Lias are the most persistent 

 and widely developed of the upper division of the Lias formation in this County. 



List of Fossils from the Zone of Harpoceras serpentinmn {Gloucestershire). 



Reptilia. 



Teleosaurus temporalis, JBlainv. 

 Ichthyosaurus acutirostris, Owen. 



Pachycormus latirostris, Agass. 

 Leptolepis concentricus, Egert. 



Coleia, sp. 



Libellula Brodiei, Buck. 



Belemnites tripartitus. Sow. 



— Voltzii. 



— subtenuis, Phil. 

 Nautilus astacoides, Young and Bird. 

 Stephanoceras commune. Sow. 



— annulatum, Sow. 



Harpoceras serpentinum, Reinecke. 



Pishes. 



Plesiosaurus (vertebrse). 

 Pterodactylus (coracoid of). 



Tetragonolepis discus, Egert. 

 Dapediiis, sp. 



Crustacea. 



Insecta. 



Agrion Buckmauni, Brod. 



Cephalopoda. 



Harpoceras bifrons, Bnig. 



— falciferum, Sow. 



— Lythense, Young and Bird. 



— Raquinianum, d'Orbig. 

 Lytoceras cornucopise, Young and Bird. 

 Phylloceras heterophyllum. Sow. 

 Belemnosepia (ink-bag and osselets). 



