J. F. BLAKE OS THE KIMMERIDGE CLAY OP ENGLAND. 227 



Lttctna minuscula, n. sp. PI. XII. fig. 8. 



Small, compressed, oval, £ as high as broad ; beaks not very pro- 

 minent, nearly central, slightly anterior ; without ornaments beyond 

 fine lines of growth ; breadth -L in. 



In the upper Kimmeridge in millions everywhere. A small shell 

 from the lower Kimmeridge, which I place with this at present, is 

 more quadrilateral, by the posterior part of the hinge being straight, 

 meeting the hinder edge at an angle. 



I have seen no figure of a similar shell. It is much more trans- 

 verse than L. minima (Rom.). 



CrPEINA CYEENIFOKMIS, n. Sp. PI. XII. fig. 6. 



This shell, as far as can be seen, has the hinge of a Cyprina, 

 but in shape it is very like a Oyrena. Oval, breadth -J of the height, 

 inflated; beak prominent, excentric, f to the front, incurved. 

 No ornaments beyond fine striae of growth. Breadth |- of an inch. 

 Very nearly allied to Cyprina tenuirostris (Et.) ; but that is broader 

 still, and has its beaks more prominent and excentric, and its form 

 more triangular. It is nearer still to Cyprina pulchella (De Loriol), 

 but is more eccentric and has not the anal side truncated. 



Abundant at the base of the Lower Kimmeridge, Woodhall Spa 

 and Eingstead : the specimens from the latter locality not so broad. 



AsTAKTE SUPRACOKALLINA (D'Orb.). 1850. 



Dollfus, who has given a figure of A. my sis (D'Orb.), states that 

 these two species are distinct. The numerous specimens from 

 almost every locality where Lower Kimmeridge Clay is found, agree 

 better with Goldfuss's figure of A. supracorallina. They are all 

 striated, however, which is not a character of either. They agree in 

 this respect with the A. carinata (Ph.) described by Professor 

 Morris (Quart. Journ. Geol. Soc. vol. vi. p. 317) ; but the furrows are 

 not twice the breadth of the ribs, nor equal to them, as in Goldfuss's 

 species. The lunule, too, is not smooth. If, therefore, these shells 

 are not A. supracorallina, with which on the whole they best 

 agree, they are neither mysis nor carinata, but a new species. 

 Being the characteristic species of the English Lower Kimmeridge, 

 as A. supracorallina is of the foreign, it seems better to suppose 

 the species variable in these small details. 



This species has been found in the Subwealden boring, as we 

 might expect. 



Ceromya okbicularis (Rom.). = C comitates (Cont.). 



Anatina mintjta, n. sp. 



Shell narrow and oval anteriorly, broad and truncated posteriorly, 

 inferior border very gently convex, not parallel to the superior ; 

 beaks -| to the front, with a fold running backwards, making a small 

 angle with the superior border ; all the shell not included within 

 this angle ornamented with concentric folds ; breadth -i- in. 



This minute species is common in and characteristic of the upper 

 zones of the Lower Kimmeridge in Dorsetshire and Lincolnshire. 



Q. J. G. S. No. 122. e 



