458 DE. J. E. XEESON AND ME. G. B. LAFFAN ON [Aug. 1 894, 



Mollusca from Twickenham. 



Ancylus fluviatilis, Mull. Valvata piscinalis, Miill. 



Limncea peregra, Mull. ! Pisidium amnicum, Miill. 



Planorbis albus, Miill. pusillum, Ghnel. 



Bythinia tentaculata, Linn. Sphcerittm cornewm, Linn. 



Plants from Twickenham. 



Stellaria media, Cyr. 

 Montia fontana, Linn. 

 Heracleum Sphondylium, Linn. 

 Galeopsis Tetrahil, Linn. 

 Atriplex sp. 



Polygonum Persicaria, Linn. 

 Bumex crispus, Linn. 



Potamogeton rufescens, Schrad. 

 Zannichellia palustris, Linn. 

 Eleocharis palustris, It. Br. 

 Scirpus lacustris, Linn. 

 Carex panicea, Linn. 



sp. 



Phragrnites. 



The whole of the 8 species of mollusca and the 14 of plants are 

 still living in the neighbourhood. They point, as Mr. Eeid remarks, 

 to swampy ground and a small pool or channel rather than to 

 running water or any large stream. 



Lying just upon the layer of dark loam were found scattered 

 all along the section a great number of mammalian bones, about 

 300 altogether, which were carefully preserved and sent for deter- 

 mination to Mr. A. Smith "Woodward, Assistant Keeper of the 

 Department of Geology, British Museum (Nat. Hist.), to Mr. E. T. 

 Newton, F.R.S., of the Geological Survey, and to Prof. Charles 

 Stewart, P.L.S. The following species were identified: — 



Bos longifrons. 



taurus. 



Cervus capreolus. 



Sus scrofa. 

 Cervus elaphus. 

 Canis lupus. 



Bangifer tarandus. Bison priscus. 



Much interest was aroused with regard to the bones of the Bos, 

 Mr. Smith Woodward, Mr. Newton, and Prof. Stewart considering 

 them to belong to Bos longifrons, while Prof. Boyd Dawkins, F.P.S., 

 to whom some of them were sent, affirms them to be ' Bos taurus, 

 a domesticated variety larger in the horns than the actual strain of 

 Bos longifrons.'' 1 



A noticeable point in connexion with the femora and humeri, the 

 marrow-bones of the bison, was that in most cases the bones were 

 broken, and the shaft split or cracked as if from direct violence, 

 and this suggested to Dr. Gunther, P.E.S., of the British Museum 



1 [It having been objected that the Authors, when referring to the occurrence 

 of the remains of Bison priscus and Bos longifrons lying on the top of the 

 dark layer of loam, seem to convey the impression that the two animals were 

 contemporaneous, whereas throughout the Thames Valley deposits Bos longi- 

 frons is always referred, and justly so, to a much later date than Bison priscus, 

 the Authors of this paper wish, in reply, to state that they have no theory upon 

 the subject. The bones were collected by the navvies, as they were found, 

 according to their statements, just on the top of the dark loam-layer, and put 

 into a sack until they were handed to the Authors. Whilst on the one hand 

 there is no reason to doubt the accuracy of the men's statements, there is on 

 the other no desire to elevate them to the standard of skilled observers : the 

 facts must be taken for what they are worth. — May 15th, 1894.] 



