T. Mellard Reade—Keuper Marls at Great Crosby. 445 



OXY^NA GALLIC, Filhol.^ 



A specimen of the muzzle of the species, 

 of which only a fragment of the mandible 

 has been yet described, shows that there are 

 but two pairs of incisors in the upper jaw, 

 in place of the three which occur in all the 

 American species. This specimen is figured 

 in the accompanying woodcut (Fig. 2). I 

 may add that I have very considerable doubt, 

 whether Oxycena should be separated from 

 Pterodon. 



EODENTIA. 

 Theridomys, from the Headon beds. 



The Theridomys from the Headon beds 



of Hordwell''' is indistinguishable from the 



continental T. aquatilis, Aymard ; and may 



probably be referred to that species. 



Arch^omys, fi-om the French Phosphorites. 



Nesokia, from the Siicaliks of India. 



A portion of the mandible of a rat from 

 the Siwallks of India (No. 16529, a), 

 noticed by myself in the " Palgeontologia 

 Indica," ser. 10, vol. iii. p. 126 (1884) 

 as Mus. (?) sp., turns out to belong to the genus Nesolcia; 

 and is practically indistinguishable from the mandible of the 

 existing iV. EardwicTci, Gray. From the difiSculty experienced 

 by zoologists in determining the number of existing species, 

 it would be rash to say that the recent and fossil forms are 

 specifically the same, altliough it is quite possible that this may 

 be the case. Although the Siwalik Mammalia belong as a rule to 

 extinct forms, it is quite probable that some of the Eodents may have 

 persisted to the present day. 



Fig. 2. Oxy(Bna g allies. 

 Anterior portion of left 

 half of palate. From the 

 Phosphorites of Cay lux. x- 



IV. — On a Section of Keuper Marls at Great Crosby. 

 By T. Mellard Reade, C.E., F.G.S. 



A LITTLE more than half a mile in a direct line south-east of the 

 village of Great Crosby, at Moorside, the Silicate Brick and 

 Tile Company are excavating clay and shale for brick-making. The 

 excavation at present is about 60 yards square and 35 feet deep from 

 the original surface of the ground to the lowest point. It discloses a 

 section of much interest. 



In descending order we have surface soil and from 8 to 15 feet 

 of Boulder-clay, the remainder being composed of argillaceous shales 

 belonging to the Keuper marls. The Boulder-clay is of the ordinary 

 character which covers most of the surface of the country about, and 

 belongs to the Low-level Boulder-clay and sands, which I have else- 



1 Ann. Soc. Sci. Phys. et Nat. Toulouse, 1882, p. 34. 



2 Vide Quart. Journ. Geol. Soc. vol. xxxvi. p. 383. 



