55 St. Maurice and CivAiborne Pelecypoda 55 



Area (Acar) reticulata Gmelin, PI. 22. Figs. 18, 19 



Area reticulata Gmelin, Syst. Nat., VI, 1792, p. 331 1. 

 Barbatia {Acar) 7-eticulata Dall, Trans. Wag. Ill, '98, p. 629. 

 Gmelin'' s original description. — A. testa subrhomboidea decussatim 

 striata alba : natibus approximatis, vulva cordata. 

 List. Conch., t. 233, f. 67. 

 Martini Besch. Berl. Naturf. 3, t. 6, f. 9. 

 Chemn. Conch. 7, t. 54, fig. 540. 



Dall, lac. cit. includes a number of recent and Tertiary Acar 

 forms in this species. He remarks : ' 'The fossils are identical 

 with the recent shells in every particular, and there can be no 

 doubt that this species has existed continuously in the Antillean 

 region since the Upper Eocene. ' ' Doubtless the Upper Eocene 

 forms he refers to, from Jackson, Miss., are small Area aspera of 

 Conrad, though in his synonymy of that species Dall places it \xvl- 

 d.QX ciLailloides. If the Jackson aspera is included in reticulata, 

 there seems to be no reason why this St. Maurice form should 

 not be likewise included. 



Horizon. — Mid-Eocene to Recent. 



Specimens figtired. — Paleont. Coll. Cornell Univ. 



St. Maurice localities. — Wautubbee and Hickory, Miss. ; 

 Smith ville, Tex. 



Area aldrichi Dall, PI. 22. Fig. 20. 



Barbatia [Cucullaria) aldrichi Ti&\\, Trans. Wag., Ill, 1895, p. 630. pi. 



32, fig. 19. 

 Area aldrichi Sheldon, Palgeontogr. Amer., vol. i, 1916, p. 23, pi. 



5, fig- 5- 

 DalPs original description. — Shell small, elongate, thin, somewhat 

 pointed behind, rounded in front, moderately convex, with low, prosogyrate 

 beaks ; cardinal area very narrow and elongated, widest in front of the 

 beak ; surface evenly sculptured by fine equal, flattish radial riblets, separ- 

 ated by narrower grooves and crossed by irregularly spaced impressed lines ; 

 inner margin of the valves smooth or slightly fluted in harmony with the 

 ribs, especially behind ; beaks in the anterior forth ; hinge line about two- 

 thirds the length of the shell ; hinge anteriorly with four oblique, rather 

 close-set teeth, separated by a wide gap from the posterior teeth, which are 

 about six in number, smaller proximally, and parallel with the hinge line. 

 Lon. 8.3. alt. 5, diam. 4 mm. 



This single valve is all that is known of this species ; it came 

 from the Claiborne ' 'sand' ' and is in the National Museum. The 



