Correspondence— Mr. Alfred Bell. 41 



SUSSEX AND SUFFOLK TEETIAEIES. 

 Sir, — 1. In the course of the last summer I obtained from the Eed 

 Crag at Butley, near Chillesford, the following forms : 



LimncBa sp. 



Planorbis complanatus, L. 



I'upa marginata, L. 

 Limncea pereger, Miill. 

 „ truncatula, Miill. 



All the above are new to the Eed Crag except the last. They 

 were intermixed with marine shells. 



Eesting on the London Clay in the coast near Felixtow, I found a 

 freshwater river deposit, containing amongst other shells Cyclostoma 

 elegans and Helix aspersa. The bed is overlain by about two feet of 

 gravel, and that again by the surface soil. The river has undercut 

 the Boulder-clay to a considerable extent on each side. 



The bed is worth notice, as the evidence that the above shells occur 

 fossil in Bi'itain is very meagre. 



2. To the Shells listed by Mr. Godwin-Austen from the Mud- 

 deposit at Selsey, I can add the following, two being altogether new 

 to Britain, but living with Lutraria rugosa and Pecten polymorphus 

 in the Mediterranean, making four southern forms,only found in this 

 deposit. 



Fleurotoma {Mangelid) rupa, Montagu. 

 Liitorina rudis, Mason. 



,, obtusata, Linne. 



Lacuna puteolus, Turton. 

 liissoa parva, Da Costa. 



„ striatula, Montagu. 



„ interrupta, Adams. 



„ costulata, Alder. 



,, membranacea, Desmarest. 



„ striata, Adams. 

 Hydrobia uIvcb, Pennant. 

 Odostomia plicata, Montagu. 



„ indistineia, var. suturnalis, Phi- 



„ pallida, Montagu. [lippi- 



Trochus lineatus. Da Costa. 



Trochus exasperatus. Pennant. 

 Adeorbis subcarinata, Montagu. 

 Solarium pseudo-perspectivum, Brocchi 

 Turritella communis, Eisso. [(New). 



Utriculus obtusus, Montagu. 

 Patella vulgata, Linne. 

 Chiton marginatus, Pennant. 



,, fascicularis, Linne. 



„ sieulus, Gray (New). 

 Anomia ephippium, Linne. 

 Ostrea edulis, Linne. 

 Cytherea chiotie, Linne. 

 Syndosmya tenuis, Montagu. 

 Saxicava rugosa, Linne. 

 Corbula gibba, Olivi. 



For the determination of the more critical forms I am indebted to 

 Mr. J. Gwyn Jeffreys, Alfred Bell. 



29, Grafton Street, Fitzroy Square. 



DISCOVEEY OF BOS PRIMIGENIUS IN THE LOWEE BOULDEE- 

 CLAY OF SCOTLAND. 



Sir, — Mr. Geikie, in reply to my note on the above subject (in 

 the October Kagazine), reads a lecture on my assumed ignorance of 

 what constitutes Boulder-clay — the gratuitous assumption cannot 

 alter the facts of the case in question. If a Glacier has deposited the 

 beds of sand and earthy clay that fill two small basins that over- 

 lie the stratified bed, in which the Bos was found, it must have 

 been very diiferent from the one that preceded the stratified bed. The 

 latter has left evidence of its passage on the rocks of the valley ; 

 the former has left none on the soft mud-bed, over which it must 

 have passed — this stratified bed being as smooth and undisturbed, as 

 if newly deposited in a quiet lake. Not wishing to enter into a con- 

 troversy with Mr. Geikie, I merely point out this fact for his con- 

 sideration. Egbert Craig. 



Langsidb, Beith, Nov., 1868. 



