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TERTIARY FAUNA OF FLORIDA ' ^ 



Genus ALIGENA H. C. Lea. 



Aligena H. C. Lea, Trans. Am. Phil. Soc, 2d Ser., ix., p. 238, 1845. Type A. striata Lea, 



op. cit., pi. 34, fig. 13 (not Haligenes Guenther, Pisces, 1859). 

 Laubriereia Cossmann, Cat. 111. has. Paris, ii., p. 76, 1887. Type Erycina emarginata 



(Desh.), op. cit., pi. 4, fig. 13. 

 Kelliopsis Verrill and Bush, Proc. U. S. Nat. Mus., xx., p. 783, 1898. Type Montacuta 



elevata Stm., op. cit., p. 784, pi. 93, figs. 2-4, pi. 94, figs. 7-8. 

 Amphidesma (sp.) Conrad, Fos. Medial Tert., p. 65, 1845. 

 Abra (sp.) Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 574, 1863. 



The genus as described by Lea included two species ; the second, A. 

 levis * (Lea, fig. 14), is apparently a species of Fitlcrella, but agrees less well 

 with Lea's generic diagnosis than the first species here cited as the type. The 

 characteristic of this group is the possession of a rounded triangular inflated 

 shell with only a single small anterior tooth under the beaks, separated by a 

 gap from the surface of attachment, under the posterior dorsal margin, of an 

 elongate internal resilium carrying a lithodesma. The pallial line is simple, 

 and the cardinal of the left valve more feeble than the other. Spaniodon Reuss 

 (Sitzb. K. K. Akad. VVien., vol. 55, p. 134, 1S67, type 5". nitidus Reuss, loc. cit.), 

 from the Miocene of Galicia, must, from the figures, be closely related to 

 Aligena. 



Aligena eequata Conrad. 



Plate 24, Figures 8, 8a, 8fo. 



Amphidesma aquata Conrad, Proc. Acad. Nat. Sci. Phila., i., p. 307, 1843 ; Fos. Med. 



Tert, p. 6s, pi. 36, fig. 5, 1845 ; Tuomey and Holmes, Pleioc. Fos. S. Car., p. 95, pi. 23, 



fig. S, 1856. 

 Aligena striata H. C Lea, Trans. Am. Phil. Soc, 2d Ser., ix., p. 238, pi. 34, fig. 13, 1845. 

 Abra aquata Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 574, 1863. 

 Kellia (sp.) Orbigny, Prodr., iii., p. 115, 1852. 

 Aligena crquata Dall, Trans. Wagner Inst., iii., p. 919. pi. 24, fig. 8, iSgS. 



Miocene of St. Mary's County, Maryland ; Petersburg, Virginia ; Natural 

 Well and Magnolia, Duplin County, and Wilmington, North Carolina, and of 

 the Peedee River, Sottth Carolina ; Pliocene of the Caloosahatchie beds, 

 Florida. 



This shell is quite variable in its outline, occasionally being ovate-oblong, 



* This was referred to Kellia by d'Orbigny (Prodr., iii., p. 115, No. 2153, 1852), who, 

 as there was already a Kellia Icevis, changed the specific name to subltrvis. 



