OF CONCHOLOGY. 77 



ANOMIID^E. 



DIPLOSCHIZA, Conrad. 



Description. — Shell bivalve, with, a deeply notched or emar- 

 ginate hinge in both valves ; smaller valve concave ; struc- 

 ture laminated. 



D. cretacea, Conrad* 



Description. — Short-ovate ; larger valve ventricose, with one 

 to three distant concentric undulations; umbo truncated; small- 

 er valve deeply concave; cardinal notch carinated on both 

 sides. 



Dimensions. — Length J inch. 



Locality. — Alabama. Cretaceous. Dr. Showalter. 



Observations. — -This genus seems to approximate more nearl v 

 the families Anomiidse and Terebratulidse, bearing the same 

 relation to Anomia that Morrissia does to Terebratula. The 

 shell seems to have been attached by the umbo of the larger 

 valve, the truncature of which reminds us of the truncated 

 beak of Terebratula. 



TEREBRATULIDSE. 



TEREBRATULINA, D'Orbigny. 

 T. filosa, Conrad * 



Description. — Sub-orbicular, with numerous thread-like, 

 close, ramose, radiating lines. 



Locality. — Alabama, in rotten limestone (cretaceous). Dr. 

 Showalter. 



This species differs from T. gracilis, in having finer lines, 

 and in the wave of the basal margin, which is in the opposite 

 direction from that of T. gracilis. 



LACUNARIA, Conrad. 



Description. — Ovato-conoid or sub-globose, thin in substance, 

 with delicate, close, revolving lines ; aperture entire, rounded 

 or round-ovate, angulated posteriorly, margins disunited; col- 

 umella flattened, with a long groove descending from the um- 

 bilicus. 



L. Alabamiensis (JSfatica), Whitfield. — Amer. Journ. Conch., 

 Vol. L, p. 265, pi. 27, figs. 9, 10. 



* To be figured in tbe next No. of this Journal. 



