412 NEWTON : MOLLUSCAN REMAINS IN BRITISH KEUPER. 



4980). A small fragment of another shell, probably belonging 

 to this species, is in Mr. Brodie's collection, and is shown in 

 fig- 3- 



Plwladoniya (?) Richardsi. 



Fig 2. 

 (Enlarged twice). 



Fig 3. 



(Enlarged twice). 



Nucula (?) Keuperina sp. nov. 



Fig. 4 (drawn twice natural size) represents the right valve 

 of an oval-shaped shell having its umbo situated either mesially 

 or slightly on the posterior side. The anterior area is rather 

 more extensive than the posterior, and the margins are round. 

 The sculpture, which is most obscure, appears to consist of a 

 series of acutely sinuated striae, which ornaments the upper half 

 of the valve, whilst below these occur a few concentrically 

 arranged sulcations or lines of growth. 



Dimensions. — 20 mm. in length, 14 mm. in height. 



Observations. — A fragment of this shell in Mr. Brodie's 

 collection (fig. 5) was mistaken for a portion of Goniomya at the 

 time when my paper was read at the British Association \ last 

 ye:ir. The present specimen being more complete has enabled 

 me to rectify this determination. Instead of having a central 

 set of V-shaped ribs fitting into one another beneath the umbo, 

 as in the true Goniomya, this impression shows the sinuated 

 stride continued over the upper portion of the valve, thus pre- 

 senting a series of zig-zags or divarications. Some Niiculce 

 exhibit a somewhat similar character, as for instance Niiada 

 CobboldicB J. Sowerby, from the Crag formation, though the 



\ For abstract of this see the ' Geological Magazine,' 1893, p. 557. 



J.C., vii. , July 18 



