no Blxletix 31 no 



exterior radii ; muscular markings rather faint. 



This is more uearh* related to Ball's sd?ifi7/afa from the 

 Claiborne than Aldrich's/r/wt? 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 

 proportionall}- than this ; prhna 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 Universit}-. 



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



Alveinus mi)uita Con., Amer. Jr. Conch., vol. i, 1S65, p. 13S, pi. 10, 



fig. 2. 

 Alveinus i/i 2 ;iuf us Meyer, Bull. Geol. Surv. Ala., No. i, 1S86, p. 84. 



pi. I, fig. 19. 

 Alz'eitius minufus'Da.W, Trans. Wag., 1900, III, p. 1166-67. 



Conrad's original description 0/ Alveinus. — Equivalved, smooth ; an- 

 terior, posterior and ventral margins channelled^^•ithin ; 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. 



Me\'er claims to ha\'e 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 description. — Shell small, thin, polished, smooth, 



