DERIVED FOSSILS. 153 



In these characters it approaches the fine species so abundant 

 in the middle series at Tealby, but its more globose and inequi- 

 lateral form and less square outline at once distinguish it from 

 that species. 



Localities. I only know of one specimen (W. M.) from the 

 black grit nodules of Upware, and one well preserved shell from 

 the Lower Cretaceous sands of Doddington in Lincolnshire. 



B. THE DERIVED FOSSILS OF NEOCOMIAN AGE. 



(See ante, p. 31.) 



ANCYLOCERAS ? 



Scattered joints, nearly one inch in diameter, are occasionally 

 found at Upware. In the Potton beds much larger specimens 

 occur, which have been referred, with good reason, to Ancyhceras 

 giyas. Similar large fragments, likewise in a phosphatised condi- 

 tion, may be picked up on the shore in Heligoland, where they are 

 washed out of the Speetonian clays. 



AXCYLOCERAS, sp. 2. 



Two phosphatised fragmentary specimens of this species have 

 occurred in the Upware deposit. They are about 1| inches long 

 and \ inch in greatest diameter. Section circular or elliptical. 

 The ribs are simple, bifurcate or trifurcate, and somewhat ir- 

 regular in size ; some of the ribs are simple throughout. All the 

 ribs pass regularly over the back, but are only represented by 

 delicate lines on the concave side. 



Locality. Upware. 



AMMONITES DESHAYESII, Leym. 



This is a not uncommon fossil amongst the phosphatic nodules 

 of Upware. 



It is undoubtedly a derived fossil, having frequently been 

 broken up and rolled into pebbles on the Neocomian shore at 

 Upware. All the specimens are in a phosphatised condition a 

 gritty phosphate and its mode of occurrence and general condition 

 are very similar to the Ammonites liplex. 



Localities. Upware, Atherfield, Speeton (Upper Neocomian). 

 N. Europe. Brunswick, Upper Neocomian (Judd). 

 S. Europe. Paris area, Aptien. 



