On a Scr/ion in the Post-glacial Deposit at Hornsea. 423 



Beetle remains — 



Doiuiria, sp. I Agabus, sp. 



Pteros/ichns, sp. I 



Winter Egg" of Spongilla. 



Valves of a Cypris. 



Vertebrate Remains — Bones of red deer, bird, and fish. 



It will be noticed that the list of plant remains shows some 

 iidditions to the preceding list of Mr. Reid's. 



Mr. Reid has already pointed out a comparison between the 

 shell fauna of the present Hornsea Mere and that of the peat 

 bed representing an ancient mere. Recent investigations, how- 

 ever, by the Leeds Conchological Club and the Hull Scientific and 

 Field Naturalists' Club have resulted in the list of recent shells 

 being increased from twenty-six to thirty-three* as under : — 



.SegiHentiiia nitida. 

 Phi itorb is fan ta n us. 



,, nan t ileus. 



,, a (bus. 



spirorbis. 



,, vortex. 



,, carinatus. 



,, umbilicatus. 



,, conieus. 



,, contort us. 



Bull in us hypnoruui. 



Physa fontinalis. 

 Linuuva peregra. 



,, auricularia. 



,, st agnails. 



,, palustris. 



,, truncatula. 



,, glabra. 

 I 'elletia lacustris. 

 By thin la tentaculata. 



,, leachii. 

 I 'uhiHtlu pisrinalis. 



Valval a cristata. 

 Anodonta cygncea. 



,, anatina. 



Splice ri ion corneuni. 



,, rivicola. 



, , lacusfre. 



Pisidiu ni henslo7iHin u in, 



,, cinereuin. 



,, pus ilium. 



,, nifiduni. 



,, in ilium. 



Of these all but Splucrinm rivicola and Liniiuea glabra have 

 been confirmed. 



Of the fossil species occurring in the bed recently exposed, 

 iind not recorded by Mr. Reid, are the following: — 



Segmoitina nitida. 

 Plaii'irbis pan'iis. 



,, albus. 



., spirorbis. 



,, vorte.x. 



,, umbilicatus. 



, , glaber. 



L ill! ntea au riciila ria. 

 ,, truncatula. 



Wilvata cristata. 

 Anodonta cygncea. 

 Pisidium fontinale. 



,, nitidum. 



,, in ilium. 



Three of these, Planorbis parvus, P. glaber, Pisidium fontinale, 

 are recorded as fossils only. 



From these subsequent researches it would appear that the 

 analogy between the recent and fossil shell fauna is closer than 

 was apparent when the Holderness Memoir was written. 



* Some little time ago Mr. W. Deiiisoii Roebuck, F. L.S. . prepared some 

 extensive notes on the Molluscan Fauna of Hornsea Mere for a meeting of 

 the Hull Club. These will appear in due course in its Transactions. 



1906 December i. 



