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



259. 



1869. Lea, Isaac. Obscrvatious | on the | Genus Unio ; | together with | Descriptions 

 of New Species in the Family Uuiouida;, | and Descriptions of New Species 

 of the I Melauida; and Pahidinse. | Read before the Academy of Natural 

 Sciences of Philadelphia, and Published | in their Journal. | by | Isaac Lea, 

 LL. D., I Vice-President of the American Philosophical Society, Etc., Etc. | 

 With Twenty-Six Plates. | Vol. XII. | — | Philadelphia: | Printed for the 

 Author. 4°, pp. 105, -n ith plates, 29 to 54 inclusive. 

 This is a reprint of numbers 257 and 258. 



260. 



1869. Lea, Isaac. Index ] to Vol. XII. | and Supplementary Index to Vols. I. to XI. 

 of I Observations | on the | Genus Uuio, | together with | Description of New 

 Speciesof the Family Uniouida', | and | Description ofNew Species of the Mela- 

 nidse, | Paludinte, Helicidas, Etc. | Read before the American Philosophical 

 Society and the Academy of Natural ) Sciences of Philadelphia, from 1827 to 

 1868. I by I Isaac Lea, LL.D.,Etc. | — ] Vol. IL | — | Philadelphia: | Printed 

 for the Author | by T. K. Collins, 705 Jayue Street. | 1869. 4°, .pp. 23. 



"The index which I published, in 18G7, of the eleven volumes of my Observations on the 

 Genus Unio, etc., has proved so useful for reference to the Genera and Species described by 

 me, I am induced to continue it for Vol. XII., and to issue with it an index of the subject- 

 matter of the whole twelve volumes. I have also included tables of Errata and Corrigenda, 

 that the whole may bo made as complete and useful to the student of this iuteresting branch 

 of zoology as possible."— Contents, p. 3. 



* ORDER OF ARRANGEMENT. 



Section I. embraces new species of North American Vnionidce, original descriptive matter, 

 and miscellaneous references to the same species in Vol. XII., in continuation of Section I., 

 Index to Vols. I. to XI. 



Subsections — ITnio, Margaritana, Anodonta. 

 Section II. embraces new species of Vnionidce of Mexico and Central America, original 

 descriptive matter, and miscellaneous references to the same species m Vol. XII., in con- 

 tinuation of Section II., Index to Vols. I. to XI. 

 Subsections — Unio, Anodonta. 

 Section m. embraces new species of Exotic Unionidce, original descriptive matter, and 

 references to the same species in Vol. XII., in continuation of Section HI., Index to Vols. I. 

 to XI. 



Subsections — Unio, Anodonta, Monocondyloea, Mycetopus. 

 Section IV. embraces Miscellaneous Unionidce, etc. (genera and species), to which inci- 

 dental references have been made in classifying and comparing species under description, in 

 Vol. XII., in conttuuation of Section IV., Index to Vols. I. to XI. 



Subsections— Anodonta, Area, Castalia, Dipsas, Iridina, Monocondyloea, Mycetopus, 

 Prisodon, Spatha, Triquetra. 

 Section V. embraces Operculated Univalve Aquatic Mollitsca in Vol. XII., in continuation 

 of Section V. Index to Vols. I. to XI. 

 Part A. embraces new species only, and miscellaneous references to the same. 

 Part B. embraces miscellaneous species, subjects of incidental remarks in classifying and 

 comparing sjiecies under description. 



Subsections — Anculosa, Goniobasis, Lithasia, Paludina, Schizostoma, Trypanos- 

 toma. 

 Section VI. embraces subject-matter (not necessarily descrii)tivo or comparative of species) 

 in the series of volumes from I. to XII. alphabet icallj' arranged. Nearly all that refers to 

 Vol. I. to XI. is supplementary, and will not be found in the previous index. 

 Section VII. embraces Errata and Corrigenda. 



Part A. is supplementary to the table of "Errata and Corrigenda" of Vols. I. to XI. in the 

 index to those volumes. 

 Part B. embraces Errata and Corrigenda of Vol. XII. 

 Part C. embiaces Errata and Corrigenda of Index to Vols. I. to XI. 



