WALDIIEIMIA. 575 



border of the loop being always in front of the mouth ; the 

 beak is truncated ; there are two ear-like expansions on the 

 sides of the umbo ; and the foramen is partly encircled by 

 a deltidium united or disunited in different species. 



Species of Terehratulina. 



abyssicola, Adams and Reeve. Cumingii, Davidson. 



angusta, Adams and Reeve. Japonica, Sow. 



cancellata, Koch. septentrionalis, Couth. 

 caput-serpen tis, Linn. 



Genus tvaldheimia, King. 



Shell smooth or plicate; foramen complete. Loop 

 elongated and reflected ; central septum of the smaller 

 valve elongated. 



Ex. W. flavescens, Lamarck, pi. 130, fig. 3. Shell, 

 W. flavescens, fig. 3, a, 3, b. 



This genus, which is the same as the " Terebratuhe with 

 long loops " of Davidson, differs from Terebratella, which 

 it seems most to resemble, in the crura of the lateral ap- 

 pendages not being attached in their middle by processes 

 to the central lamella. 



Species of Waldheimia. 



Californica, Koch. globosa, Lam. 



caurina, Gould. lenticularis, Desh. 



cranium, Mull. Patagonica, Gould. 



dilatata, Lam. picta, Chem. 



flavescens, Lam. septigera, Lovth. 



Sub-gen. eudesia, King. 

 Shell with the beak round; valves sharply plaited. 

 Giayii, Davidson. 



