BIBLIOGRAPHY OF PUBLICATIONS OF ISAAC LEA, LL. D. 161 



261. 



1869. Lea, Isaac. Notes oa Microscopic Crystals included in some Minerals. <^Proc. 

 Acad.Nat.Sci.,Phila.,xxi,p.4. February, 1869. Separate with No. 262. 8°. 

 pp. 7. 



Read before the Academy of' Natural Sciences Febraary 16, 1869, and ordered to be pub- 

 lished Feb. 23, 1869. This foims part of No. 272. 



262. 



1869. Lea, Isaac. Further Notes on Microscopic Crystals in some of the Gems, &c. 

 <^Froc. Acad. Nat. Sci.,PMIa., xxi, pi). 119-121. May, 1869. Separate with 

 No. 261. 8°. pp. 7. 



Read before the Academy of Natural Sciences May 11, 1869, and ordered to be published 

 May 2S, 1869. This forms part of No. 272. 



263. 



1869. Lea, Isaac. Descriptions ofsix new species ofFresh Water Shells. <^Proc.Acad, 

 Nat. ScL, Fhila.,xxl, pp. 124-125. June, 1869. 



Read before the Academy of Natural Sciences June 15, 1869. This forms part of No. 272. 



Latin descriptions of the species, with mention of Habitat. 



Unio Macnielii, Lea, n. s 124 



Rio Gigillillo, Corcuera, Nicaragua, Cent. Amer., M. J. A. McNiel. 



Journ. Acad. Nat. Sci., viii, 1874, p. 25. 

 Ooniobasis baculoides. Lea, n.s 125 



Coosa River, Alab., Dr. Schowalter. 



Journ. Acad. Xat. Sci., viii, 1874, p. 62. 

 Goniobasis Lawrencii, Lea, n. s 125 



Washita River, near Hot Springs, Arkansas, Dr. Lawrence. 



Journ. Acad. Nat. Sci., viii, 1874, p. 62, as G. Lawreneei. 

 Schizostoma Lewisiijliea,,!!. s 125 



Coosa River, Alabama, Dr. Schowalter. 



Journ. Acad. Nat. Sci., viii, 1874, p. 61. 

 Physa Garltonii, Lea, n. s 125 



Mount Diablo, California, W. G. "W. Harford. 



Journ. Acad. Nat. Sci., viii, 1874, p. 63. 

 Physa Wolflana, Lea, n. s 125 



Hot Springs, Colorado Ter., Prof. J. W. Powell. 



Journ. Acad. Nat. Sci., viii, 1874, p. 63. 



264. 



1869. Lea, Isaac. Are Unios sensitive to light. <CAmer. Journ. Sci. Jr/s,xlvii, 1869, 



pp. 430-431. 



265. 



1870. Lea, Isaac. A | Synopsis | of the | Family Unionidse. \ by ! Isaac Lea, LL.D., | 



Vice President of the American Philosophical Society ; | Late President of the 

 Academy of Natural Sciences of Philadelphia ; | Member of the Zoological 

 Society of London, Etc., Etc. | Fourth Edition, very greatly enlarged and 

 improved. | Philadelphia: | Henry C.Lea. | 1870. 4to. pp. xxx, 25-184. Ded- 

 icated to Isaac Hays, M. D. 



Preface to Fourth Edition. 



"It is now eighteen years since the last edition of this ' Synopsis ' was published. The 

 advancement of the knowledge of Natur.il History has been acceler.ated during that period 

 by the labors of many men of science, tho younger of whom have embraced the study with 

 great earnestness and energy. The effect of this progress has been felt very sensibly in that 

 interesting group of 2Iollusca which embraces tho Family TJnionidce. Consequently the Ad- 

 ditions of species .nnd synonyms have been largely increased, resulting, iu fact, in more than 

 doubling the lists of the last edition. The labor required for this portion of the work has 

 been very great. 



The same principles of arraugeraentof the tabular system which were used in the previous 

 editions have been retained in this. After the experience of thirty-four years since the tirst 



1748— BuU. 23 11 



