126 



THE LIAS AMMONITES. 



The fossils collected here show that the Serpentinum- and Bi/rons-hedfi are those divi- 

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

 demonstrates : 



Cephalopoda. 



Harpoceras serpentinum, Rein. 



— bifrons, Brug. 



— elegans, Sow. 



— falciferum, Sow. 



— radians, Rein. 

 Stephanoceras commune, Sow. 



Stephanoceras crassum, Phil. 



— Holandrei, d'Orb. 



— annulatum, Sow. 

 Phylloceras beterophyllum, Sow. 

 Belemnites compressus, Voltz. 



— tenuis, PliUL 



Lamellibranchiata. 



Leda ovum. Sow. Posidonomya Bronni, Voltz. 



Inocramus dubius, Sow. Nucula cordata, Gold/. 



Ostrea subauricularis, d'Orb. I Astarte striatosulcata, Sam. 



From the above list it appears that the Serpeniinum- and Bi/rons-heds are go 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. 



Zisi of Fossils from the Zone of Harpoceras serpentinum [Gloucestershire). 



Rep TIL lA. 



Teleosaurus temporalis, Blainv. 

 Ichthyosaurus acutirostris, Owen. 



Pachycormus latirostris, Agnss. 

 Leptolepis concentricus, Egert. 



Coleia, sp. 



Libellula Brodiei, Buck. 



Belemnites tripartitus. Sow. 



— Voltzii. 



— subtenuis, Phil. 

 Nautilus astacoides, Toung and Bird. 

 Stephanoceras commune, Sow. 



— annulatum, Soiv. 



Harpoceras serpentinum, Reinecke. 



Fishes. 



Plesiosaurus (vertebrae). 

 Pterodactylus (coracoid of). 



Tetragonolepis discus, Egert. 

 Dapediiis, sp. 



Crustacea, 



Insecta. 



Agrion Buckmanni, Brod. 



Cephalopoda. 



Harpoceras bifrons, Brug. 



— falciferum, Soiv. 



— Lythense, Young and Bird. 



— Raqiiinianum, d'Orbig. 

 Lytoceras cornucopise. Young and Bird. 

 Phylloceras heterophyllum, Sow. 

 Belemnosepia (ink-bag and osselets). 



