l6o BUI.I,ETIN 31 160 



cerned, both Conrad's and Gabb's descriptions and figures leave 

 much to be desired, especially Gabb's. His description is simply : 

 "Wide, flattened, nearl}^ equilateral ; beaks small, inclined in- 

 ternall}' ; hinge line in advance of the beaks straight ; posterior 

 slightly curved ; surface smooth or covered only by obsolete lines 

 of growth. 



Length .5 in., width .9 in., thickness .2 in. 



Caldwell Co., one specimen in my collection." 



Gabb's type is in the Academj^'s collection and from it we 

 were enable to identify fig. 10 of pi. 49. It is just possible that 

 Gabb's inooreana when full-grown may be the equivalent of the 

 much heavier types along the Rio Grande. 



The more t5^pical papy^'ia are found at the base of the Clai- 

 borne bluff, though occurring in casts in considerable abundance 

 in the greenish white, hard clays 5 miles N. of Orangeburg, S. C. 



7)/;^^.— Conrad Coll. Acad. Nat. Sci. Phila. 



Horisoyi. — St. Maurice Eocene. 



Specimens figured. — Base of Bluff, Claiborne. Now in Pal. 

 Museum, C. U. 



Localities. — The so-called mooreana : Mosle^^'s Ferry, Cedar 

 Cr. ; Little Brazos River, Cherokee Co. ; Gonzales Co., Texas. 



The more t3-pical papyria: Wautubbee, Miss. ; Hamilton 

 Bluff, Lisbon, base of Claiborne Bluff, Ala. ; 5 miles N. of 

 Orangeburg, S. C. 



Teilina aldrichi Dall, PI. 49, Fig, 12 



T. {Mcerella?) aldrichi Dall, Trans. Wag., Ill, 1900, p. 1017, pi. 46, 

 fig- 9- 



Dair s original description. SheW large for a Mccrella, elongate, with 

 very slight dorsal slopes, rounded in front, arcuate below, and bluntly 

 pointed behind ; beaks incurved, pointed, not prominent, posterior end 

 hardly folded ; surface smooth, with obsolete concentric undulations and 

 rare radial striulations ; lunular region deeply impressed ; hinge normal. 

 L,on. 20, alt. 10, semidiam. 2.5 mm. 



A single left valve, with the interior inaccessible except the hinge, 

 was sent by Mr. Aldrich with specimens of the T. papyria, from which itdif- 



