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TERTIARY FAUNA OF FLORIDA 



Recent from the Carolines to the West Indies, and on the west coast of 

 America at Mazatlan. 



Variety rotunda Dall. 



Oligoccnc of the Chipola marls, Chipola River, Florida, Burns; of the 

 silex beds at Ballast Point, Tampa Bay, Florida, Dall; of the Bowdcn marl, 

 at Bowden, Jamaica, Henderson. 



Shell resembling the m>ata of the same size, but not attaining so large a 

 size as the adult ovata, with a more rounded posterior end and rather shorter 

 gape, the myophorc decidedly larger, wider, and more conspicuous. Lon. 7, 

 lat. 3.5, diam. 2.8 mm. 



The differences between the recent and the Oligocene shells are so slight, 

 and the range of variation in the living specimens so marked, that I feel 

 unwilling, though the distinctive characters above mentioned seem constant, 

 to give the fossil shells more than varietal rank until I have seen a larger 

 number of specimens. 



Gastrochaena ligula II. C. I.ca. 



<;,fi/n>i-/i(i"ii(t ligitlii II. C. I.ea, Trans. Am. Phil. Soc., 2cl Ser., ix., p. 234, pi. 34, fig. 6, 

 1X45 ; Conrad, I'roc. Acad. Nat. Sci. Phila. for 1862, p. 571, 1863. 



Oligocene of the O.ik Grove sand at Oak Grove, Santa Rosa County, 

 Florida, Burns; Miocene of the Natural Well, Duplin County, North Caro- 

 lina, Burns; and of Virginia, at Petersburg, Lea. 



This shell is distinguishable from the others by its narrow and slender 

 form and feeble concentric striation. 



Gastrochaena cuneiformis Spcngler. 

 (i,is/ri>i-/iti-ini i inti-ifonius Spgl., Nova Acta Soc. Hafn., ii., p. 179, figs. 8-1 I, 1788 ; Lam., 



An. s. Vert., v., p. 447, 1X18; Shy., Gen., figs. 3-5, 1820; Orbigny, Moll. Cubana, 



ii., p. 228, 1845. 



/'/in/us /liuiis (imclin, Syst. Nat., vi., p. 3217, 1792. 

 Chana cuneiformis Ret/ins, Diss. Nov. Test., p. 19, 1788. 

 I'islitliiiiii nipi-stris ISosc, Hist. Nat. Coq., ii., p. 205, 1802. 

 l\i>i-i-llitriii liitnis II. and A. Ads., Gen. Rec. Moll., ii., p. 336, 1856; Tryon, Mon. Pholacl., 



p. 47, 1862. 



Pliocene marl of the Croatan beds, North Carolina, Johnson; of the 

 Caloosahatchie and Shell Creek, Florida, Dall and Willcox ; of Trinidad, 

 Guppy ; Pleistocene of South Carolina, Florida, and the West Indies ; recent 

 from Cape Fear, North Carolina, southward to the West Indies. 



