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TERTIARY FAUNA OF FLORIDA 



more distinctly and regularly crenulate, the posterior more irregular; the 

 interspaces about as wide as the ribs, and on the anterior half of the shell 

 squarely channelled ; posterior end of the shell produced and pointed, anterior 

 end rounded, base mesially slightly concave; lunule small, deeply impressed, 

 the anterior lateral tooth very prominent; hinge-teeth normal, rather slender; 

 inner margins of the valves deeply fluted. Length 43, height 24, diameter 22 

 mm. The beaks are situated at about the anterior sixth of the shell. 



The original figure of this species in Part I. was taken from a silicious 

 pseudomorph which perhaps had been derived from a specimen which had 

 been somewhat worn before being fossilized. Though certainly identical with 

 the Chipola specimens from which the description is written the sculpture is 

 less well preserved and smoother. 



Cardita (Carditamera) Guppyi Dall. 



PLATE 56, FIGURE 3. 



Cardita minima " Sow." Guppy, Geol. Mag., dec. ii., vol. i., p. 18, 1867 ; not of Reuss, 

 Bohm. Kreidef., ii., p. 14, pi. xxxiii., fig. 14, 1844. 



Pliocene of Matura, Trinidad, also recent ; fide Guppy. 



I am unable to find any Cardita minima of Sowerby in the literature, and, 

 at any rate, the name is preoccupied. Guppy's types are of small size, with 

 about fourteen rounded ribs, separated by narrower interspaces, and more or 

 less crenulated. The hinge is normal, the form trapezoid, and the beaks in- 

 conspicuous. The larger specimens are about 4 mm. in length and 3 in height. 



Cardita (Carditamera) recta Conrad. 

 Carditamera recta Conrad, Am. Journ. Conch., iv., p. 279, pi. xx., fig. 2, 1868. 



Miocene of Charles County, Maryland ; Cope. 



This appears to be a good species, notable for its elongation, straight form, 

 and very anterior beaks. It has about sixteen ribs ; the hinge is delicate and 

 the teeth very slender. 



Cardita (Carditamera) arata Conrad. . 



Cypricardia arata Conrad, Fos. Sh. Tert. Form., i., p. 20, pi. v., fig. i, 1832. 

 Carditamera arata Conrad, Fos. Medial Tert., p. ii, pi. vi., fig. 2, 1838; Proc. Acad. Nat. 



Sci. Phila., xiv., p. 579, 1863. 

 Carditamera carinata Conrad, Proc. Acad. Nat. Sci. Phila., i., p. 305, 1843; Fos. Medial 



Tert., p. 65, pi. xxxvii., fig. i, 1845 ; Proc. Acad. Nat. Sci. Phila., xiv., p. 579, 1863. 

 Cardita carinata Tuomey and Holmes, Pleioc. Fos. S. Car., p. 67, pi. xix., fig. 6, 1855; 



Emmons, Geol. Rep. N. Car., p. 302, 1858. 



