48 Bulletin 9 240 



Conrad' s original description. — "Shell compressed, thick, ine- 

 quivalve, reticulated ; with a broad subcentral sinus, passing 

 from the beak to the basal margin ; posterior side elongated, 

 strongly ribbed, and carinated ; anterior side with numerous 

 striae ; anterior end truncated. Length 2^ inches. Breadth i^ 

 inches. 



' ' The hinge of this shell approaches Cucullcea in the interval 

 between the beaks, having arcuated grooves under the beak ; 

 line of series of hinge teeth widely interrupted, and transverse 

 at the extremities." Locality ; Claiborne, Alabama. 



The variety has a somewhat more pointed posterior basal 

 angle and has somewhat more sharply defined sculpturing than 

 the type specimen, especially on the post-umbonal slope. Yet 

 they seem scarcely distincft specifically. 



Type. — Academy Natural Sciences, Philadelphia. 



Localities (Lignitic). — Alabama: Gregg's Landing. Bell's 

 Landing, — Aldrich. Georgia : Ft. Gaines, ledge 

 50 feet below top of cliff, i.e. bed 8 ; see. p. 33. 



Specimen figured. — Gregg's Landing. Paleont. Museum, Cor- 

 nell University. 



Trigonarca pulchra, var. pi. g, figs. 2, a. 



Syn. Noetia pulctira Gabb. Jr., Acad. Nat. Sci. Phila., vol. 4, p. 388, pi. 

 67, fig. 55, i860. 

 Lintopsis pulctira Heilp., Proc. Acad. Nat. Sci., 1890, p. 403. 



Gabb' s original description. — "Subquadrangular ; beaks small, 

 incurved ; umbonal slope nearly straight ; anterior margin 

 rounded, basal arcuate ; posterior subangular ; surface marked 

 by numerous radiating and transverse lines ; edge crenate with- 

 in ; posterior muscular scar subtriangular, anterior subrhom- 

 boidal. 



''Dimensions. — Length .27 in., width .35 in." 



The variety in hand is much smaller than the typical spec- 

 imen from Texas and the radiating lines are far less distin(5t ; 

 yet the general form is the same — quite unlike the Claiborne 

 and Lower Claiborne species of Alabama. 



Lignitic Locality. — Alabama : Woods Bluff, Hatchetigbee. 



Specimen figured. — Woods Bluff ; Paleont. Museum, Cornell 

 University. 



