x. BRACHIOPODA. CONCHIFERA. 125 



The above list would be considerably enlarged by counting 1 in 

 the species found by Mr. Moore near Ilminster, and by receiving 

 as species some of the many varieties which solicit attention among 

 Khynchonelk) and Terebratulse. It will be remarked that nearly 

 all the localities are in the lower or the middle lias; there are, 

 however, three or four species admitted by the Geological Survey 

 from the upper lias, the cap of sands, and the cephalopodal bed. 



All the genera were known in the palaeozoic strata, and all 

 excepting Spirifera are frequent in the oolites and later deposits. 



On comparing specimens which might be selected from the lias 

 and others from the carboniferous limestone and earlier strata, it 

 would be possible to find no obvious external difference ; and there 

 is seldom an opportunity to examine the interior, so as to compare 

 the loops of Terebratula and the prominent plates of Rhynchonella. 

 When so examined there is some difference, but it appears small 

 in comparison of the immensity of elapsed time and the total 

 difference in representatives of other classes of animals. 



FOSSILS OF THE LIASSIC PERIOD. 



CONCHIFERA. 

 Monomyaria. 



Anomia attached to Crenatula. L. Near Stow. 

 Avicula contorta. PortL K. Wilmcote. 



cygnipes. Phil L. Chadbury near Evesham, Horfield, Banbury, &c. 



M. Dumbleton. 



longiaxis. Buckm. L. Battledown. 

 novemcostas. Brown. L. Fenny-Compton, Mickleton. M. Shotswell 



near Banbury. 



Crenatula ventricosa. Sow. L. Fenny-Compton, Cheltenham. M. Dumbleton. 

 Gastrochsena tortuosa. Phil. L. Banbury. 

 Gervillia crassa. Buckm. L. Bredon, Banbury. 

 fornicata. Lycett. S. Nailsworth. 



Hartmanni. Munst. S. Nailsworth, Frocester, Leckhampton. 

 lae.vis. BucJcm. L. Cheltenham, Mickleton. 



Gryphsea gigantea. Sow. M. Stinchcombe, Churchdown, Dumbleton, 

 incurva. Sow. L. Frethern, Fenny-Compton, Harbury. 

 MacCullochii. Sow. L. Cheltenham. M. Stow, 

 obliquata. Sow. L. Fenny-Compton, Gretton. 

 Hinnites abjectus. Phil. M. By field. S. Frocester, Nailsworth. 

 Inoceram'us dubius. Sow. M. Bredon. U. Dumbleton. 

 Lima antiquata. Sow. L. Fenny-Compton. 

 bellula. Jjycett. S. Frocester, Nailsworth. 

 duplicata. Sow. M. Gretton, Mickleton. 

 electra. D'Orb. S. Frocester, Nailsworth. 

 gigantea. Sow. L. Fenny-Compton, Wilmcote. 



