6 astacim:. 



The better description authorizes us to prefer a name published one 

 month later. 



1830. R Harlan, in Trans. Amer. Philos. Soc. Phila. III. 464, gives 

 the description of Astacus Blandingii from South Carolina, repeated in 

 1835 in his Medic, and Phys. Research. 229, with the addition of short 

 specific characters of Astacus Bartonii and affinis, and the figures of the 

 three species. But the numbers of two species are erroneously changed 

 in the drawings. The specimen types preserved in the collection of 

 the Philadelphia Academy have been kindly communicated to me by 

 Professor Leidy. 



1833. John D. Godman, in Rambles of a Naturalist, Philadelphia, 

 pp. 40, 41, has communicated his observations upon the burrowing habits 

 of Cambarus Diogenes. I have not seen this work, which is quoted by 

 Mr. Ch. Girarcl. 



1837. Professor Milne-Edwards, of Paris, in his Hist. Nat. des Crust., II. 

 331, describes Astacus Bartonii, affinis, and Chilensis. The change of the 

 numbers in Harlan's figures has apparently induced him to reverse the 

 names of the two species. 



1839. Mr. J. W. Randall, Journ. Acad. Phila., VIII., Part I. 138, 

 describes Astacus Oreganus from the Columbia River, figured in pi. 7. 

 The description is very short and the figure apparently very erroneous. 

 The type was lost by the artist, and it is still impossible to identify the 

 species. 



1842. De Haan, in Faun. Japonic. Crust., 164, has observed the 

 interesting fact that Astacus Bartonii and A. affinis possess one gill less 

 than A. fluviatilis and Japonicus. The gill on the fifth pair of legs is 

 wanting. 



Professor Z. Thompson, in his Natural History of Vermont, 170, 

 notes the occurrence of Astacus Bartonii in that State. 



1844. In J. Mueller, Archiv. 383, Dr. Tellkampf describes the re- 

 markable blind species from the Mammoth Cave in Kentucky, A. 

 pcUucidus. 



James E. De Kay, in his Zoology of New York, Part VI., Crustacea, 

 22, gives the description and figure (pi. 8, fig. 25) of Astacus Bartonii, 

 and the diagnoses of A. affinis, Blandingii, and Oreganus. 



1845. I. E. Gray published in Journals of Exped. of Discovery in 

 Central Australia, by E. J. Eyre, a paper on some Astaci from New 

 Holland, in which he suggests that the genus Astacus may be divided 

 into three sections, characterized by the texture of the caudal segment, 

 in being calcareous or not to its top. Mr. James D. Dana has proved 

 that this character cannot be of much value in classification. 



1846. Erichson, in Wiegmann's Archiv. Jahrg., XII. 86, and supple- 

 ment, 375, gives an elaborate monograph of the whole genus Astacus. 

 He describes from America, Astacus pcUucidus, affinis, Carolinus, Bar- 



