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587 



TERTIARY FAUNA OF FLORIDA 



which is a wider furrow extending to the upper end of the rostrum ; interior 

 smooth; pallial sinus angular, well-marked; seventeen anterior and eighteen 

 posterior teeth, which are small and delicate ; chondrophore subumbonal, not 

 projecting. Lon. 18, alt. 8, diam. 5.5 mm. 



This species and another were in the hands of Mr. T. H. Aldrich when 

 he described his Lcda dongatoidea (Bull. Am. Pal., No. 2, p. 17, pi. v., fig. 2). 

 His description and figure apply to that one, and his remark about larger 

 specimens to the present species. From the types L. dongatoidea is a smaller 

 and flatter species with a sculptured ray on the rostrum and stronger incre- 

 mental lines. The same species has been found in the Zeuglodon bed of 

 Alabama. 



Leda pharcida n. s. 

 Plate 32, Figure 8. 



Lignitic or Chickasawan Eocene of Wood's Bluff, Alabama, C. W. 

 Johnson and T. H. Aldrich ; also at McKay's marl bed, Suwashee Creek, 

 two miles south of Meridian, Mississippi, L. C. Johnson. 



Shell solid, large, elongated, sharply sculptured; anterior end shorter, 

 posterior end longer, rostrate, obliquely truncate; surface covered with low, 

 sharp, concentric, elevated laminse with slightly wider interspaces, ending 

 above anteriorly on the lunular carina, behind angulated at the lower border 

 of the rostral ray, the interspaces much wider on the ray, and the laminae 

 strong and blunt on the dorsal edge or keel of the ray; beaks inconspicuous ; 

 lunule nearly linear, slightly excavated ; escutcheon deep, flat, with an 

 elevated line, inside of which are longitudinal and outside of which are 

 oblique striae ; end of the rostrum obliquely truncate, slightly recurved ; base 

 arcuate ; pallial sinus rounded, small ; there are more than thirty-five teeth 

 on each side of the moderately large subumbonal chondrophoric pit; the 

 rostrum has no internal ridge. Lon. 36.5, alt. 14, diam. 7 mm. 



This is nearest L. opuloita Conr., in which the sculpture of the rostral 

 ray is divided into two areas of loops by a sharp groove, and the escutcheon 

 is much smoother and divided into deeply excavated areas. This species is 

 sometimes found in collections under the name of L. protexta Conrad, but 

 there is no evidence of any connection specifically between them or any of 

 the synonymes of protexta. L. opidenta is a much rarer shell from the Clai- 

 bornian. L. regina-jacksonis Harris (Jacksonian) is higher behind, with the 

 middle ventral margin straight, and feebler sculpture. 



