94 ALBIAN FOSSILS DISCOVERED AT OKEFORD FITZPAIXE. 



parallel ; the umbo is a short distance from the anterior extremity, 

 obscure and not elevated above the dorsal border ; surface bearin^ 



' o 



fine lines of growth which are obtusely augulated posteriorly ; test 

 fragile. 



D'Orbigny established this specific name for an imperfect shell 

 obtained from the Albian deposits at d'Ervy in the Aube Depart- 

 ment of France. His specimen consisted of what he termed the 

 anterior part of the shell, but which from tke truncated character 

 of the growth lines seen in his illustration would more correctly be 

 described as belonging to the posterior region. Except that 

 d'Orbigny mentions its general resemblance to Solen Vagina, 

 Linnaeus, no further attempt at the characterisation of this shell is 

 made in the text, having therefore nothing but the figure to guide us. 



I believe its occurrence in this country was unknown until Mr. 

 de Ranee recorded it from Black Ven, near Lyme Regis. 

 Dimensions Height =10 



iht = 10 1 



T V ^ [Millimetres. 

 Length = 22 J 



RANGE OF SPECIES. Albian. 

 LOCALITIES. d'Ervy, Black Ven, &c. 



THRACIA, n. sp. 



Thracia simplex, R. B. Newton : Geological Magazine, 1896, 

 p. 200, wow d'Orbigny, 1843. 



The following characters are drawn up from a very imperfect 

 form of Thracia, which I had erroneously determined in my 

 previous paper as T. simplex, Orbigny. The ventral and part of 

 the anterior details are not seen, otherwise I should have been able 

 to submit a more complete description. Shell with valves in 

 contact, much compressed though slightly convex in the umbonal 

 region ; beaks obtusely acute, 25 millimetres from the posterior 

 margin, and a little raised above the nearly-horizontal postero- 

 dorsal line ; posterior end truncated, vertical, area obliquely angled 

 and flattened ; the antero-dorsal line slopes abruptly from the 

 beaks ; test nacreous, obscurely granulated and showing some 

 indistinct lines of growth. 



