232 Rev. W. V. Vernon on a Discovery 



to the lioness) ; and the other broken bones indicate a very 

 powerful animal, the head of the radius being ^th longer than 

 that of a I'ecent lion in the York Museum. 



Accojint of tlie Shells^ (including those collected by Mr. 

 Dikes,) by John Phillips, Esq. F.G.S., Keeper of the Museum 

 of the York Philosophical Society. 



The series of shells discovered in the marl consists of 12 

 species, all perfectly identified with living types procured in 

 the neighbouring country, viz : 



TERRESTRIAL SHELLS. 



Helix nemoralis. — i specimens marked with bands, of which 

 the rufous colour, though faded, is still distinguishable. 

 I observe on 3 of them, three bands on the upper whorls, 

 and on the other, two. 



Helix caperata, 2. 



Pupa marginata, 3. 



Succinea putris, 3. 



SWAMP SHELL. 

 FRESH-WATER SHELLS. 



Lymnasa limosa, 1 . 



palustris, 15. Varying like the recent examples in 



proportion and degree of smoothness, but never beveled 

 in the upper part of the volution ; the twist on the pillar 

 lip is perhaps a little more decided and prominent. There" 

 is one specimen of a very remarkable variety, shaped like 

 L. longiscata of Lamarck, but corrugated like the other 

 specimens of L. palustris. 

 Planorbis complanatus, 23. — I can find no other difference 

 between these and those now living near York, than the 

 more frequent occurrence of spii'al striae across the lines of 

 growth. The same varieties as to flatness of whorls and 

 situation of the keel as in fresh specimens. 

 Planorbis vortex, 1. 



contortus, 2. 



nitidus. 



Valvata cristata, 1. 



Cyclas amnicus, 5, young and old. 



The shells are all white, never compressed, not particularly 

 tender, and very entire. It is probable that the Lymneeae and 

 Planorbes inhabited the waters of a marsh, that the Succineas 

 lived on the aquatic plants, and that the dead shells of Helices 

 were transported thither by rains and streamlets, as happens 

 in such situations at the present time. Two seeds were found 

 in the marl by Mr. Dikes, which appear to me to belong, the 

 one to an Umbellate plant, the other to a Juncus. 



XXXII. Qtierics 



