1864.] 



HAMILTON MAYENCE BASIN. 



279 



Table I. (continued). 



Bairdia subdeltoidea, Miinst 



arcuata, Miinst 



Cytheridea Mulleri, Munsf 



Cytherella tenuistriata, i?eMSS ... 



Cy there Volczii, Reuss 



Krebs (Crab.^ 



Sphserodus, sp. uncert 



Piscium, 9 sp. uncert 



Myliobates 



Zygobates 



Lamna cuspidata, j4g 



contortidens, Jg 



denticulata, Jg 



Carcharodon angustidens, ^g. ... 



Notidanus primigenius, Jg < 



Crocodilus, sp , 



Triom'x, sp , 



Emys hosTpes, von Meyer 



Halianassa Collinii, von Meyer.... 

 Anthracotheriutn magnum, Cuv. 



Belgium. 



as 



ho .a t 

 a c a.! 

 3 ca g j 



If from this list we direct our attention to Belgium, we find 

 in Sir C. Lyell's paper* "On the Tertiary Strata of Belgium 

 and French Flanders," that the fossils of the Limburg beds near 

 Kleyn Spawen are in a very large proportion identical with those of 

 Weinheim and its neighbourhood. The Pectunculus-bed at Berghf, 

 so called from the extraordinary number of P.fossilis contained in it, 

 has its exact counterpart at Weinheim in a bed occurring, as has 

 been already observed (p. 263), near the top of the section, contain- 

 ing a surprising number of P. crassus, Phil, and P. arcatus, Schloth., 

 overlying beds of shelly sand abounding in fossil Gasteropods and 

 Conchifers like those of the Bergh sands, d and/of fig. 2, I. c. p. 305. 

 P. crassus, Phil., is the same as P.fossilis, Linn., and P. arcatus, 

 Schloth., is P. terebratularis. Lam. 



Unfortunately, the Weinheim fossils have not yet been so accu- 

 rately worked out and referred to the different sandy beds in which 

 they occur, as those of Kleyn Spawen. For the sake of comparison, 

 therefore, we must take the whole of the lists referred to in Tables 

 VIIL and IX. {I. c. pp. 304 and 312) of Sir C. Lyell's paper, in 

 order to ascertain the resemblance between them and the Weinheim 

 beds, as given in the above table. As far as I have been able to 

 ascertain, it seems that about sixty species or nearly fifty per cent, 

 are common to the two formations, many of these being very cha- 

 racteristic shells, such as Nucula Deshayesiana, Pectunculus arcatus. 



* See Quarterly Journal Geol. Soc. vol. viii. p. 277. 

 VOL. X. — PART I. 



t Loc. cit. p. 305. 

 X 



