Bibliography of publications of isaac lea, ll. d. 55 



69. 



185L Lea, Isaac. Ou the "Wave Theory" in regard to the Dynauiics of Earth- 

 quakes. <iProc. Acad. Nat. Sci.,Flnla.. v, p. 261, No. 11, S»pt. and Oct., 1851. 



Verbal communication made before the Academy Natural Science, Phila., September 2, 

 1851. (See Proc. Amer. Philos. Soc, v, 1851, p. 232.) 



70. 



1851. Lea, Isaac. Ou the genus Acosta?a of D'Orbigny. <^Proc. Acad. Nat. Sci., 

 Phila., y, p. 277, No. 11, Sept. & Oct., 1851. 



Reporters' notes on paper, by Mr. Lea, read before the Academy Natural Sciences, PhUa., 

 October 21, 1851. No. 11, Sept. & Oct., 1851, of the Proceedings was received by the Amor. 

 Philos. Society on or before December 5, 1851. (See Proc. Amer. Philos. Soc, v, 1851, p. 232.) 



The full paper was pubUsbed in the Journal of the Academy, vol. 11, 1850-1854, pp. 125-131. 

 See No. 71. 



Mulleria Ferrussacii, new name 277 



MuUeria Ouaduasana (D'Orbigny), Lea 277 



71. 



1851. Lea, Isaac. On the Genus Acostaea of D'Orbigny, a Fresh Water Lamelli- 

 branchia. <^Journ. Acad. Nat. Sci., Phila., ii, new series, pp. 125-131. 



Kead before the Academy Natural Sciences, Phila., October 21, 1851. 



(See Proc. Amer. Philos. Soc, v, 1851, p. 232.) 



"Mr. Lea expressed his convictions that this shell, now so well described by M. D'Orbigny, 

 belonged to the -same genus which Ferussac described in 1823 in the Mem. of the Soc. Nat. 

 Hist., vol. 1, tinder the name of Mulleria, if it be not of the same species, a single specimen 

 (adult) of which bad then only been seen. Ferussac, considering the general resemblance 

 of Mulleria to Ostrca, thought it ought to be put alongside of, if not in, the Latter genus. 

 Brongniart and Latreille thought it ought to go between Spondylus and Area. 



"Other authors bad a.ssigned it to various positions, while some doubted wliether it was 

 anything more than a malformation. The perfect specimen, in its Junior .and adult state, if 

 it be Mulleria, now banish all difficulties. Mr. Lea thinks now, in placing Mulleria (Acostoea) 

 in its true position at the head of the order Monomyatia, where it makes the link with 

 Dimyaria, it forms an ea.sy transition from the first to the second order. Thus retaining the 

 trace of one while it passes so curiously into the other. Nihil per saltum. 



"Mr. Lea, under the impression that D'Orbigny's Acostcea Guaduasana may prove to be 

 a distinct species from the shell described by Ferussac under the generic name of Mulleria, 

 while it may belong to the same genus, proposes to give the name of that distinguished 

 zoologist to it. That of Guaduasana should be retained of course for D'Orbigny's species. 

 The genus would then represent Mulleria Ferussadi and Mulleria Ouaduasana." 



Eeportera' notes on this paper. See No. 70. 



72. 



1851. Lea, Isaac. [Necrological Notice of Eichard C. Taylor.] <^Proc. Acad. Nat. 

 Sci., Phila. ,Y, pp. 290-296, No. 11, Sept. & Oct., 1851. Separate, see No. 73. 



Remarks made before the Academy Natural Sciences, Phila., October 28, 1851. (See Proc 

 Amer. Philos. Soc, v, 1851, p. 232.) For separate, see No. 73. 



73. 



1851. Lea, Isaac. Biographical Sketch of Richard Cowling Taylor. 8°. pp. 1-8, 

 without title page or cover. 



A reprint of No. 72. Received by the American Philosophical Society on or before Decem- 

 ber 5, 1851. (See Proc Amer. Philos. Soc, v, 1851, p. 232.) 



74. 



1851. Lea, Isaac. [Correspondence between Mr. Lea and Prof. Agassiz, relating to 

 the observations of Mr. Lea on the anatomy of the Naiades, laid before the 

 Amer. Philosophical Society, March 21, 1851.] <^Proc. Amn: Philos. Soc.,y, 

 pp. 218-221, No. 47, July, 1851— February, 18.j2. 



Read before the American Philosophical Society September 19, 1851. No. 47 of the Pro- 

 ceedings presented to tlie Society March 5, 1852. (See Proc. Amer. Philns. Soc.,vi, p. 253.) 

 See, also, No. 65. 



