4 



BRITISH FOSSILS. 



Fig. 4. 



ASTROPECTEN A^MA^US. 



E. Forbes, in Memoirs of the Geological Survey of Great Britain," 

 vol. ii. part 2, p. 479. 



Diagnosis. A. radiis lanceolatis^ angulis intermediis valde obtusis, ossu 

 culis marginalihm oblo7igis carinatis^ extrorsum longe spinosis. 



Description.— The only fragment of this very distinct species is the 

 greater portion of a single arm. It exhibits a lanceolate, depressed 

 ray, with well-marked oblong carinated marginal ossicula, bearing 

 towards their outer sides stout linear spines, equal in length to their 

 breadth. The spines are set directly in connexion with the ridges. 

 About 19 plates, and as many spines in a row, are preserved. The 

 fragment measures nine-twelfths of an inch in breadth at its base, and 

 one inch three-twelfths in length ; the spines and plates are respectively 

 about three-twelfths of an inch in length. 



Localitjj and Geological Position. — This unique and curious specimen, 

 contained in the collection of Mr. Bowerbank, is from the London clay 

 of Sheppey* 



E. Forbes. 



April, 1849. 



