BTVALVIA. 77 



ASTARTE FIMBRIATA, IFoIton, MSS. Tab. XL, figs. 34, 34 a. 



Testa transversa, ovata, stibdepressa, umbonibus antemedianis parvis, margine cardi- 

 nali elongato, subrecto, obliquo, ac/efo ; lunula magna elliptica ; lateribus costulis concen- 

 Irids acutis, elevatis subdistantibus ; eefate progrediente crebrioribus et irregularibiis 

 instructis. 



Shell transverse, ovate, somewhat depressed ; urabones small, depressed, curved forwards; 

 liinge-margin lengthened, nearly straight, its margin acute and rendered fimbriated by 

 the acute, projecting extremities of the costae, which are elevated, concentric, distantly 

 arranged, and regular in" the young shell, but more closely arranged and irregular in 

 specimens of adult growth ; the Kmule is large, elliptical, its margins acute. 



Allied to A. dcpressa, Goldf., compared with which the umbones are less prominent 

 and more oblique, the hinge-border more lengthened, the costas more elevated and fewer ; 

 the convexity of the valves is also greater. The test is thinner than is usual with this 

 genus. 



Occasionally a small and ill-preserved specimen has been found in the Great Oolite of 

 Minchinhampton, and mistaken for A. minima, Phil. ; the costaB in the latter shell are more 

 obtuse and more closely arranged, the general figure being more orbicular. 



Geological Positions and Localities. The Forest Marble of Farleigh and the Great 

 Oolite of Bussage, near Bisley Common. 



ASTARTE? IGNOTA, Lye. Tab. XL, fig. 10. 



Testa subovafa, subdcpressa, postice truncata, in/erne etpostice oblique subangulata, um- 

 bonibus antemedianis acuminatis, lunula parva, supcrficie, plicis incrementi numerosis, deli- 

 cate instructis. 



Shell snbovate, subdepressed posteriorly, with a truncated extremity to the 

 hinge-border and with an oblique angle proceeding from the umbo to the inferior- 

 posterior border ; umbones antero-mesial, pointed, and curved forwards ; lunule slightly 

 impressed ; the surfaces of the valves with delicate, irregular, numerous plications of 

 growth. 



The hinge not having been seen, the genus is rather doubtful ; possibly it may be a 

 Cypricardia. 



Geological Position and Locality. The Forest Marble of Laycock ; in the collection of 

 W. Walton, Esq. 



