1SG:J.J 



DAY — LTAS OF DORSETSHIRE. 



205 



Turbo Itys, D Orb. 



Nireus, D Orb. 



Midas, D Orb. 



Pleurotomaria mirabilis, Desl. 



precatoria, Desl. 



bitorquata, Desl. 



sulcosa, Desl. 



rustica, Desl. 



procera. D" Orb. 



pinguis, D'Orb. (?). 



rote.la'formis. 



expansa. Soiv. sp. 



Straparollus sinister, D' Orb. 

 sp. 



Turritella, two species. 

 Chemnitzia, sp. 

 Pitonillus, sp. 

 Ammonites crassus, Phi 11. 



communis, Sow. 



Holandrei, D' Orb. 



spinatus, Brvg. 



fimbriatus, Sow. 



serpen tin us. Rein. 



radians, Rein. 



Raquinianus, D Orb. 



Belemnites, several species. 



Ancyloceras, sp. 



Fish-scales and fragments of Crustacea. 



Phasianelia, two species. 



9. The Upper Lias Limestone. — In the lower part of the Upper 

 Lias Limestone, that is, immediately over the ferruginous seam, I 

 have found Ammonites serpentimls,l&em.,in some abundance, though 

 badly preserved. 



In the upper part of the same stone occurs Ammonites bifrons, 

 Brug., which I have not met with below, associated with several other 

 Upper Lias species of Ammonites, Gasteropoda, and Brachiopoda. 



Terebratula, a small species. 

 Rhynchonella Bouchardii, Da>\ 



Moorei, Dav. 



Lepta?na liassina, Bouchard. 

 Crania, sp. 

 Cardinia, sp. 

 Astarte elegans, Sow. 

 Trochus fcrimonilis, D Orb. 

 ^Egion, D Orb. 



Ammonites bifrons, Brug. 



Raquinianus, D Orb. 



radians, Rein. 



communis, Sow. 



serpentinus, Rein. 



complanatus, Brug. 



Holandi'ei, D Orb. , 



Nautilus, sp. 



In the Upper Lias Clay 

 observed that I have not 



I have found no fossils, and it may be 

 met with any trace of the fish -bed of 

 Ilminster and Dumbleton in our series of beds. 



10. The Cephalopoda-beds. — The lower and greater portion of the 

 Upper Lias sands have afforded me no fossils, excepting a few 

 impressions of Ammonites radians ; but in the topmost part, or 

 Cephalopoda-beds, I have found several species of Ammonites. A. 

 Jarensis, Ziet., A. opcdinus, Quenstedt, and A. variabilis, D'Orb., 

 are all forms assigned to the ' Jurensis-stage ' of Continental geolo- 

 gists, and the fossils of other classes associated with these Ammonites 

 all belong rather to the Upper Lias than to the Inferior Oolite. 



Ammonites Jurensis, Ziet. 



variabilis, D Orb. 



opalinus, Quenst. 



Goniomya, sp. 

 Pecten barbatus, Sow. 

 Terebratula, sp. 



Rhynchonella tetrahedra ?, Sow. 

 cynocephala, Richard. 



Nautilus latidorsatus, D f Orb. 

 Belemnites, two species. 

 Myacites unionides ?, Gold/. 



11. Conclusion. — If we now review the chief features of the dif- 

 ferent lists of fossils given above, we shall be able to obtain a better 

 idea of the vertical distribution of particular forms (see fig. 5). 



To begin with the Ammonites. These, with some exceptions, 

 have more or less restricted ranges, and in no case does the range of 

 an Ammonite equal that of some of the most widely distributed Con- 



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