120 INVERTEBRATA. 



The muscle markings and pallial line are shewn upon an 

 internal cast from Oberau, Dresden. The two adductor impres- 

 sions are placed low in the shell ; they are rounded, and connected 

 by a simple, nearly straight pallial line. 



Localities. Upware. 



N, Europe. Lower Quader conglomerates, Oberau, near 

 Dresden ; and Lower Planer, Plauen, Dres- 

 den (Upper Cretaceous). 



Cypricardia squamosa, sp. nov. 

 (Plate vi., fig. 5, a — c.) 



Shell quadrate, but broader behind, gibbous, ornamented with 

 squamous growth laminae, crossed by more or less distinct radiating 

 striae. Umbo quite anterior, prominent, incurved ; a strong 

 rounded shoulder passes from the umbo obliquely across the shell. 

 Anal border rounded ; buccal region slightly swollen ; a gentle 

 depression meets the pallial border in front of the median line. 

 Lunule cordiform, deeply impressed. 



In the hinge two obtuse prominent teeth are seen in the left 

 valve. Right valve with (?) one cardinal tooth ; no laterals. 



The ornament consists of a few (seven or eight) prominent, 

 separate concentric lamellae ; and radiating striae which are usually 

 faint, best marked over the back, and disappearing on the pos- 

 terior side. 



Measurements. Antero-posterior diameter, 13 mm. ; dorso- 

 pallial diam., anteriorly, 9 mm., posteriorly, 11 mm.; thickness 

 (through both valves), 10 mm. 



Nearly allied to the Cardita Keocomiensis of D'Orbigny, but 

 less gibbous in shape, and further distinguished by its few, promi- 

 nent squamous lines of growth, and the faint development of the 

 radiating ribs. 



Locality. Upware. 



Cypricardia arcadiformis, sp. nov. 

 (Plate vi., fig. G.) 



Shell oblong, J.rc<x-shaped ; the sides straight, posterior border 

 oblique. Pallial border sinuated. A prominent angular shoulder 

 runs from the umbo diagonally across the shell. Umbones promi- 



