•268 



15. M. denticulata, Conrad, Journ. Ac. Nat. Sci. Phil, vi, 



22",, pi. 9, f. 21, 1830. 

 Conrad, Foss. Med. Tert. Form. U. S. p. 86 {not pi. 49, f. 

 10),* 1838. 

 Porcellana [Glabella) denticulata, Conrad, Cat. in Proc. Ac. 

 Nat. Sci. 1862, p. 564, 1862. Miocene; Maryland. 



16. M. dentifera, Lam,, Ann. du Mus. ii, 61, 1803. 

 Roissy, Buffon, Moll, vi, 10, 1805. Lam., Anim, sans Vert. 



1st ed. vii, 359, 1822. Defrance, Diet, des Sci. Nat. 

 xxix, 145, 1823. Desh., Coq. Foss. de Paris, ii, 707, 

 pi. 95, f. 27-29, 1824. Desh., Encycl. Meth. Vers, ii, 

 413, 1830. Desh. ed. Lam. Anim. sans Vert, x, 442, 

 1844. Middle Eocene ; Paris Basin. 



17. M. Deshaysii, Michelotti, Foss. Mioc. de I'ltalie Sept. p. 



321, pi. 17, f. 16, 1847. 



M. glabella (not Linn.), Sismonda, Syn. Meth. p. 46, 1847. 

 M. Deshaysii, Desh., Traite El^mentaire, pi. 123, f. 10. ? 1850. 



Miocene ; Piedmont. 

 M. DISTANS, Conrad, in Cat. Proc. A. N. S. 1862, p. 568, 

 is undescribed and unidentified. 



18. M. eburnea, Lam., Ann. du Mus. ii, 61, 1803. 



Lam., Ann. du Mus. vi, pi. 44, f. 9, 1805. Roissj'-, Buffon 

 Moll, vi, 9, 1805. Lam. Anim. sans Vert. 1st ed. vii, 

 359, 1822. Defrance, Diet, des Sci. Nat. xxix, 145, 

 1823. Brongn., Foss. Terr. Tert. Vicentin, pi. 44, f. 9, 

 1823. Desh., Coq. Foss. de Paris, ii, 707, pi. 95, f. 14 

 —16, and 20—22, 1824. 



M. hordeola, Desh., Coq. Foss. de Paris, ii, 708, pi. 95, f. 26 

 —29, 1824. 



M. eburnea, Desh., Encycl. Meth. Vers, ii, 413, 1830. Desh. 

 ed. Lam. sans Vert, x, 441, 1844. 



M. hordeola, Desh. ed. Lam. sans Vert, x, 455, 1844. 



M. eburnea, Edwards, Eocene Moll. Gr. Brit. p. 137, pi. 18, 

 f. 1 a, b, c, 1852. Eocene ; England and France, 



M. EBURNEA, Grat., is M. subeburnea. Orb. 



M. EBURNEA, Beyrich, is 31. intumescens, Koenen. 



19. M. eburneola, Conrad, Journ. Ac. Nat. Sci. Phil, vii, 



141, 1834. 



Conrad, Foss. Med. Tert. U. S. p. 86 (not pi. 49, f. ll),t 

 1838. 



* The reference to this figure in Conrad's text is evidently wrong, 

 t Wrong reference in Conrad's text. 



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