1867.] Geology and Palaeontology. 267 



materials at his command sufficient to form the basis of a scheme 

 of classification. He proposes to treat the groups Eurypterida and 

 Xiphosura as suborders of Dr. Danas's order Merostomata, the 

 former including the genera Eurypterus, Pterygotus, &c, with 

 several forms which have a more liinuloid aspect, notably Hemiaspis* 

 In the suborder Xiphosura he includes the recent genus Limulus, 

 and (what is very important) two Carboniferous genera, namely, 

 Belinurus and Prestwichia, which are, together, represented by six 

 species. The distribution of the fifteen species of Limulus is worth 

 notice, as showing the suborder to have been represented in every 

 great period since the Carboniferous, there being one species known 

 from the Permian, one from the Trias, seven from the Oolites, one 

 (doubtful) from the Chalk, and one from the Tertiary ; and there 

 are four recent species. 



A short paper by Dr. Duncan, " On some Echinodermata from 

 the Cretaceous Eocks of Sinai," is of some interest, as showing that 

 these fossils prove (1) that the Sinaitic strata are the equivalents 

 of our Upper Greensand ; (2) that they are on the same horizon 

 as the Cretaceous strata of South-eastern Arabia, and of Bagh on 

 the Nerbudda ; and (3) that the conclusions drawn by Dr. Duncan 

 from the fossil Echinoderms of the latter localities t are probably 

 well founded. 



Mr. J. TV. Flower's paper " On some Flint Implements lately 

 found in the Valley of the Little Ouse river at Thetford, Norfolk," 

 is a record of the discovery of implements of the St. Acheul type, 

 in gravel-beds in that locality, situated in a position analogous to 

 that of other implement-bearing deposits. Beyond this, however, it 

 is of considerable interest, as the author's researches have led him 

 to doubt the probability of Mr. Prestwich's conclusion that these 

 gravel-terraces were brought into their present position by river- 

 action. We cannot give all his arguments; but one, especially 

 drawn from the case recorded in the paper, deserves attention. 

 Flint implements have been found in gravel-deposits in three 

 different river valleys, very near to each other, — namely, of the 

 Waveney, the Little Ouse, and the Larke. The two former rivers 

 rise in a marsh within a few yards of one another, and then flow in 

 nearly opposite directions; and while at the present day their 

 volume, even at their highest floods, is quite inadequate to do the 

 work required of them by Mr. Prestwich's theory, in their narrow 

 watershed we can find no high land from which the snows of 

 former periods could have given forth the torrents of water invoked 

 by Mr. Prestwich in the case of the valley of the Somme. Other 

 arguments are also used by Mr. Flower with much ingenuity, and 

 his paper deserves the careful consideration of " Quaternary " 

 geologists. 



* See 'Quart. Journ. Science,' No. IX. p. 107. 

 t See • Quart. Journ. Science,' No. IX. p. 105. 



