173 Midway Stage 59 



simples, aplaties, et qui vont en s'elargessant vers le bord superi- 

 eur des valves. lyC bord interne de chaque valve est dente en 

 scie; les crochets sont tres-protuberans, recourbes et diriges vers 

 le corcelet on la place de la lunule. I^a charniere est fort epaisse, 

 et offre sur un plancher un demi-diaphragme, deux dents oblon- 

 gues, inegales, obliques, dirigees vers la crochet. Outre les deux 

 impressions musculaires, on voit, dans chaque valve, sous le cor- 

 celet, une fossette arrondie qui semble etre un point d' attache de 

 quelque partie de 1' animal. 



" Les individus plus jeunes des environs de Paris sont un peu 

 moins inequilateraux, moins oblique que ceux d' Italic; ils parois- 

 sent d'ailleurs leur resembler en tout. Ils constituent la variete 

 f:i de cette espece. ' ' 



The localities given below for this species are for the typical 

 form as represented by the figure cited. 



Localities. — Alabama: Palmer's mill, Wilcox Co., bed 21, 

 sect. p. 31; Josh Hunter's, Hamburg, between 

 Snow Hill and Allenton, bed 19; on Pine Barren 

 creek, S. of Snow Hill, bed 19; McConnico's, 

 lyi mi. S. W. of Palmer's mill, bed 18; Mr. 

 Cole's, W. of Palmer's mill, bed 18; }i mi. N. 

 of Snow Hill, "off -set"; i mi. S. W. of Clayton, , 

 Barbour Co.; i^ mi. N. E. of Clayton, Barbour 

 Cq. 

 Georgia: Near the mouth of Sandy creek, Chat- 

 tahoochee river; base of Midway, Chattahoochee 

 river. 

 At the last mentioned two localities the specimens have broad 



flat ribs but are crossed by strong or deeply impressed concentric 



lines. 



Venericardia planicosta var. smithi, j pi' c fi 1 o 



' Syn. V. planicosta Har., Geol. Surv. Ark., vol. ii, 1892, p. 42. 

 V. smithii Aid., Geol. Surv. Ala., 1894, p. 243, pi. 12, 

 figs. I, a, b. 



Aldrich's original description. — "Shell large, solid, slightly 

 transverse, inflated, inequilateral, strongly ribbed, beaks strongly 

 recurved, elevated; ribs 32-35 on specimens figured, flat in central 

 part, strongly tuberculated both on the anterior and posterior, 

 more faintly marked on the central part; teeth nearly transverse, 

 cavity of shell deep, margin crenulate, cicatrices slightly im- 

 pressed. 



" Differs from V. alticostata Con. (^transversa Lea) in the flat- 



