Bulletin 31 no 



exterior radii ; muscular markings rather faint. 



This is more nearl}^ related to Ball's scintillata from the 

 Claiborne than Aldrich's/rzwa from the Sabine. It was with 

 some St. Maurice material marked "Sabine River ?", La. The 

 other species just mentioned from our Eocene are much wider 

 proportionally than this ; prima has much coarser plications, 

 while the "grooving" mentioned by Ball on scintillata is much 

 finer. 



The figured specimen and type is deposited in the Paleont- 

 ological Museum, Cornell University. 



Alveinus minutus Conrad, PI. 37. Fig. 15. 



Alveiniis niinuta Con., Amer. Jr. Conch., vol. i, 1865, p. 138, pi. 10, 



fig. 2. 

 Alveinus minutus M.&yer, Bull. Geol. Surv. Ala., No. i, 1886, p. 84, 



pi. I, fig. 19. 

 Alveinus viinutus Dall, Trans. Wag., 1900, III, p. 1166-67. 



Conrad's original description of Alveinus. — Equivalved, smooth ; an- 

 terior, posterior and ventral margins channelledwithin ; hinge of right valve 

 emarginate under the apex, and having one pyramidal tooth anteriorly ; 

 hinge of left valve with a pit under the apex, and two compressed diverg- 

 ing teeth anteriorly ; pallial line entire ? 



Descr., minutus. — Suboval or suborbicular, ver}' inequilateral, con- 

 vex, smooth and shining ; margin rounded. 



This is a minute shell, much enlarged in the figure, and common in 

 the small quantity of marl which accompanies the specimens. The family 

 to which it should be referred is undetermined. A microscopic channel 

 margins the valves within. 



Meyer claims to have foumd this Jacksonian form in the 

 Claiborne sand and hence we have copied his figure and have 

 here included Conrad's original description, though our collec- 

 tions show no specimens below the Jackson horizon. 



Montacuta claiborniana Dall, PI. 37. Fig. 16. 



M . claiborniana Dall, Trans. Wag., Ill, 1900, p. 1171, pi. 45, fig. 21. 

 DalVs original descriptio7i. — Shell small, thin, polished, smooth. 



