64 H. E. Quitter — The Lower Lias of Leicestershire. 



Mr. E. "Wilson, F.Gr.S., who has rendered me great assistance in the 

 above list, also informs me that he detected Foraminifera in several 

 of the Lower Lias clays of the district ; in particular from the A. 

 oxynotus shales at the Tunnel near to Old Dalby Station, from 

 whence he has obtained no less than thirty forms, the following 

 genera being represented : — 



Nodosaria. 



Nonioniua. 



Frondiculari 



Involutina. 



Lingulina. 



Tulvinulina. 



Planularia. 



Textularia. 



Dentalina. 



Cristellaria. 



Orbulina. 



Marginulina. 



Cornuspira. 

 Miliola. 



General Conclusions. 



Considering the few and comparatively unimportant exposures of 

 these rocks in Leicestershire, and the consequent difficulty of ob- 

 taining a complete series of fossils, a classification of the beds into 

 life-zones would seem hardly feasible. Sufficient has been done, 

 however, to make the case good. Nevertheless, it would be prema- 

 ture at present to make any deductions with regard to the passage 

 of important species from one zone to another. 



The apparent non-development of the zone of A. angulatus, and 

 the intercalation of the zone of A. semicostatus, with the zones of A. 

 BucMandi and A. oxynotus, may perhaps be made the subject of 

 remark. That the beds of the zone of A. angulatus are present is 

 highly probable. 



Mr. J. D. Paul, F.Gr.S., informs me that 186 feet of Lower Lias 

 limestones and clay were passed through in the boring at Grown 

 Hill, near Leicester. Deducting from this, 'say 40 feet, for the 

 maximum thickness of the beds belonging to the zone of A. planorbis, 

 and 60 feet for the thickness of the lower beds of the zone 

 of A. BucMandi, which are, as already mentioned, exposed here, 

 about 86 feet of the beds passed through in the boring remain to be 

 accounted for. 



As bearing on this point, I would here note the similarity of the 

 sections at Kilby Bridge and Crown Hill, and the occurrence of JEg. 

 angulatus in the lower beds of these exposures, showing that these 

 beds are not far from the junction of the zones of A. angulatus and 

 A. BucMandi. 



The 86 feet, or thereabouts, remaining to be accounted for, may 

 reasonably be assigned to the zone of A. angulatus. The thick bed 

 of clay exposed at Barrow-on-Soar, and in the railway cutting on 

 the Uppingham Road, near Leicester, has also been thought to repre- 

 sent the zone of A. angulatus ; but if my supposition be correct, this 

 is not so. 



The fauna of this bed is so scanty, containing only jEg. catenatum, 

 Lima gigantea, and Gryphea arcuaia (the two latter being dwarf 

 forms), that we can learn nothing from it ; but the occurrence of JEg. 

 catenatum in this bed only is peculiar and interesting. 2Eg. catenatum 

 appears to be an evolutionary form between JEg. planorbis or JEg. 

 Johnstoni and JEg. angulatum. 



From this, I assume this thick bed of clay to be a bed containing 



