Meyer — On the Cretaceous Rocks. 13 



than sixteen species, several of whicli are as yet imdescribed. Dr. 

 Oppel's work (already referred to) furnishes us with figures and 

 descriptions of the Lithographic hmestone species ; and the speci- 

 mens may be studied to great advantage in the British Museum, 

 which is now the fortunate possessor of probably the finest collec- 

 tion of Solenhofen fossils ever yet brought together. We allude, of 

 course, to the Haberlein collection, which contains, among other 

 rarities, the wonderful long-tailed bird, the Archceopteryx. When 

 the entire English series are figured and published by the Palaeon- 

 tographical Society, it will afford one of the most instructive groups 

 for comparison between two distant formations of dissimilar age, 

 that has yet been called up to give evidence against that most un- 

 philosophical dogma of the contemporaneity of particular strata, 

 because they happen to occur in a similar geological horizon, 



EXPLANATION OF PLATE I. 

 ^ffer Marderi (II. Woodw.) natural size, Lower Lias, Lyme Eegis. Drawn from a 

 specimen in the Geological collection of the British Museum. 



a. First pair of monodactylous thoracic limhs, with the sete (seen more 



clearly in the woodcut, fig. 2). 



b. Second pair of thoracic appendages, which are chelate. 



c. Third pair of thoracic appendages, also chelate. 



d. Fourth ditto ditto. 



e. The fifth pair of limbs, long, slender, and monodactylous. 



f. The false abdominal swimming feet. 



g. The broad scale attached to the base of the outer antennse. 

 h. Remains of the many-jointed filaments of the antennae. 



i. The eye (its position and form are shown clearly in the woodcut of ^ger 

 tipularis, fig. 1). 



ly. ^NOTES ON THE CORRELATION OF THE CrETACEOTTS EoCKS OF THE 



South-east and West of England. 

 By C. J. A. Meyer, Esq. 

 (PLATE II.) 



IT is attempted in the accompanying diagram (Plate II.) to exhibit, 

 as clearly as is possible in a single section, the local chronolo- 

 gical arrangement and position of the more remarkable Cretaceous 

 deposits between Eolkestone and Guildford, and also their probable 

 correlation with the same series in the Isle of Wight and the vicinity 

 of Lyme Eegis. The diagram therefore represents an ideal section 

 of the Cretaceous series from Folkestone in Kent to Lyme Eegis in 

 Dorsetshire, exhibiting at a glance the relative positions of the strata 

 in the order of their deposition, but without allowing for variation in 

 thickness or possible want of conformity in stratification. 



The section is divided into several distinct horizons, in accordance 

 with the recognized sub-divisions of the Cretaceous series as named 

 in the margin. 



Without either questioning or asserting the correctness of these 



