349 LiGNiTic Stage 57 



Syn. Crassatella alta Tuomey, 2d Biennial Rep't, p. 271, 1858. 



C. tumidula Whitf., Amer. Jour. Conch., vol. i, p. 267, 1865. 

 C. tumidula Aid., Bull, i, Geol. Surv. Ala., p. 57, 1886. 



Whitfield's original description. — "Shell sub-triangular or sub- 

 clavate in outline ; anterior end broadly rounded ; posterior end 

 narrow, acute ; valves ventricose in front, attenuated behind, 

 with a shallow sulcus in front of the umbonal slope ; surface 

 smooth, except rugose markings on the umbones ; hinge teeth 

 moderately large ; lateral tooth elongate, linear ; ligamental area 

 shallow, broad-triangular ; muscular scars large ; anterior sub- 

 reniforni ; posterior circular ; margin of shell finely crenulate on 

 the anterior and an tero- basal portions. 



"Closely resembles C. petropsis Gabb, a Cretaceous species. 



''Locality. — Six miles above Claiborne, Alabama, west side of 

 the river." 



The locality designated is doubtless Gregg's landing. 



Whitfield's specimen was small but the description is such as 

 to determine the species beyond a doubt. 



Localities. — Gregg's Landing; Bell's Landing, and Yellow Bluff, 

 on the Alabama River. 



Type. — Hall's colle(ftion. 



Specimens figured.— Yq:Clo\n Bluff; Paleont. Museum, Cornell 

 University. 



Crassatella halel, n. sp. PI. 11, fig. 5. 



Syn. Crassatalla mississippiensis Tuomey, 2d Biennial Rep't p. 271, 

 1858. 

 ? Crassatella sp. Aid., Bull, i, Geol. Surv. Ala., p. 57, 1886. 



Specific characterization. — Size and general form as indicated 

 by the figure ; roughly quadrangular and with coarse concentric 

 lirations while young, becoming rapidly smoother with additional 

 increments of growth until near the basal margin in the adult 

 state the surface is again more or less rugose ; basal margin very 

 arcuate ; posterior truncate ; post-umbonal slope broad with of- 

 ten a faint longitudinal medial depression ; large tooth in right 

 valve set much more obliquely than in the preceding species ; 

 margin may be either crenate or not crenate. 



Named in honor of C. S. Hale, who first investigated and de- 

 scribed the Lignitic beds of Alabama. 



