44 



MK. A. 3U". DAVIES ON THE KIMEELDGE CLAY [Feb. I907, 



It agrees very closely with C. pulchella, de Lor. (to which Blake 

 refers as near to his species), in shape, dimensions, and . orna- 

 mentation, but differs from it in two respects — (a) the umbones 

 cannot be described as ' assez gros et renfles,' for they terminate in 

 a fine point with a slight spiral ; (b) the angle at which the valve- 

 margins meet is acute instead of being slightly obtuse. In com- 

 paring his species with others near it, M. de Loriol remarks : — 



* La C. semiparvula, Etallon, non figuree, a des crochets termines en spirale 

 distincte, ce qui n'existe point dans la C. pulchella? (Op. tit. p. 56.) 



This suggests the possibility that the Brill species may be the same 

 as G. semiparvula, but I have not succeeded in finding Etallon's 

 description. 



Blake, after comparing C. cyreniformis with C. tenuirostris, 

 Etallon, remarks that 



* it is nearer still to Cyprina pulchella, de Loriol, but is more excentric and has 

 not the anal side truncated.' (Op. tit. p. 227.) 



The Brill species is not more excentric, and the anal side, although 

 I should not describe it as truncated, exactly resembles M. P. 

 de Loriol's figures. 



The differences between these species are so slight that, without 

 an examination of the type-specimens, I hesitate to name the Brill 

 specimens definitely. 



The following are the dimensions of the three compared, Blake's 

 measurements being translated, into millimetres and his proportions 

 into decimals, for comparison with the others : — 





Brill : Four specimens. 



C. cyreniformis, 

 Blake. 



C. pulchella, 

 de Lor. 



Length 



17 

 14-5 



8-5. 



•85 

 •50 



•41 



16 



12 



9 



•75 

 •56 



13- 

 105 



7-5 



•80 



•58 



•38 



11- 



8-8 

 64- 



•80 

 •55 



•39 



17 

 13 l 



•75 

 •40 



17 

 15 * 



10 1 



•88 

 •58 



•41 



Heigbt 



Thickness 



Height 



Length 



Thickness 



Length 



Proportion of ^ 

 length an- j 

 terior to f 

 umbo. J 



1 Calculated from the proportions given, to the nearest millimetre. 



[Through the kindness of Dr. Smith Woodward, I have had an 

 opportunity of examining the Blake Collection, now in the Natural 

 History Museum. The type of Cyprina cyreniformis does not 

 appear to be present. — A. M. D., January 12th, 1907.'] 



AsTARTE, 5 Spp. 



No less than five species of Astarte occur in the serpulite- doggers 

 at Brill. Of these, one is easily identified as A. ovata, Smith ; a 



