THE NAUTILUS. 75 



Panopea bitruncata Cotirad. , • . 



Paiiopaea americana Stimpson. Check List Shells N. Ainer. 

 Smiths. Misc. Coll., Vol. II, 1-860; Coues, Proe. Acad. Nat. Sci., 

 1871, p. 130 ; not of Conrad 1838. 



Glycimeris bitruncata Conrad. Proc. Acad. Nat. Sci. for 1872, 

 p. 216, pi. 7, f. 1. 



Panopsea bitruncata Tryon. Amer. Marine Conch., 138, pi. 21, 

 fig. 321, 1874. 



. Panopaa menurdi Heilprin. Trans. AVagner Free Inst., I, 90, 

 pi. 9, f. 19, 1887 ; not of Deslrayes. 



Panopsea Jioridana Heilprin. L. c. I, 91, pi. 10, A 21. 



Panopsea navicula Heilprin. L. c. 1, 91, pi. 10, f. 22. 



Panopsea reflexa Dall. Bull 37, U. S. Nat. Mus.-, p. 70, 1889; 

 not of Say. 



Panopcea Jioridana Dall. L. c. Ill, pi. 4, p. 831, 1898. 



Conrad's type was obtained at Fort Macon, North Carolina; it is 

 also recorded from Cape Lookout, (Bickmore); Mobile Point, Miss., 

 {Conrad), and the west coast of Florida (Wilicox). It has also been 

 taken at Crooked Island, Calhoun Co., Fla. (Clarence B. Moore), 

 two specimens measuring 180x109 mm., and 165x112 mm. It is a 

 common species in the pliocene of thi? Caloosohatchie, Sliell Creek, 

 and Alligator Creek, Florida. 



The original spelling of the generic name is Panopea Menard, 

 1807. It is Glycimeris Lamarck, 1799, (not Glycymeris Da Costa, 

 1778), and Panopsea Lamarck, 1812. 



NOTES ON EASTEEN AMERICAN ANCYLI. III. 



BY BRYANT WALKKR. 



xVti hi: 



Section Ferrissia. 

 III. Ancylus Jilosics Conrad (1834). PI. 6, rigs. 1-8. 



Conrad's description of this species is very meager. No dimen- 

 sions are given and the only real specific character indicated is " the 

 numerous, radiating, prominent lines." Subsequent authors have 

 supplied no additional information except Haldeman, who gives a 

 figure, though, curiously enough, he states in the text that the species 

 is unknown to him. No specimens from the original locality, the 

 Black Warrior River, have been accessible to me. The only ex- 



