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



85. 



185'i. Lka, Isaac. On tlie Fossil Foot-Marks j in the | Red Sandstouo of Pottsville, | 

 I'ennsylvauia, | by | Isaac Lea, | Member of the Am. Phil. Soc; of the Acad, 

 of Nut. Sciences of Pliihula. ; | of the Zool. Soc. of Londou; of the Imperial j 

 Soc. of Moscow, &C. &c. I [from the Transactions of the American Philo- 

 sophical Society, Vol. x.] | Philadelphia: | Printed for the Author. | 18.')2. 

 4to. Pp. 1-13, plates 31-33. 



This is a separate of No. 84 aud was received from the anther by the Academy Natural 

 Sciences, Phila., June 1, 1852. (See Proc. Acad. Nat. ScL, Phila., v, p. xxii.) 



86. 



1852. Lea, Isaac. [On a remarkably large 8])ecimen of Dipsas plicatus, Leach.] 

 <^Proc Acad. Nat. Sci. Phila., vi, p. 52. 

 Verbal communication made March 2, 1852. 



87. 



1852. Lea, Isaac. [On the period of maturing and ejecting the young in the family 

 Uuiouidte.] <^Proc. Acad. Nat. Sci. Phila., vi,p. 54. 

 Verbal communication made March 23, 1852. 



88. 



1852. Lea, Isaac. Description of a new species of Symphynote Unio. <^Pivc. Acad. 

 Nat. Sci., vi,pp. 54-55. No. 2, March aud April, 1852. 



Kead before the Academy Natural Sciences, Phila., March 9, 1852, and printed with the 

 Proceedings of March 30. See (Proc. Amer. Philos. Soc, v, p. 271.) 



Unio Cumingii, Lea, u. s 54 



Northern part of China, H. Cuming. 

 Joum. Acad. Nat. Sci., iv, 1860, p. 240. 



89. 



1852. Lea, Isaac. Definition of the term Species and remarks on the Classification 

 of the Family Naiades. <^Proc. Acad. Nat. Sci. Phila., vi, pp. 57-58. No. 2, 

 March and April, 1852. 



Communication made to the Academy Natural Sciences, Phila., April 6, 1852. (See Proc. 

 Amer. Philos. Soc, v, p. 271.) 



90. 



1852. Lea, Isaac. [Remarks on a stone slab containing supposed imprints of human 

 feet.] <iProc. Acad. Nat. Sci., Phila., vi, p. 106. 

 Verbal communication made June 1, 1852. 



91. 



1852. Lea, Isaac. [On some shells from the drift near Philadelphia.] <^Proc. Acad. 

 Nat. ScL, Phila., vi, p. 106. 



Verbal communication made June 1, 1852. 



92. 



1852. Lea, Isaac. Description of a new species of Eschara, from the Eocene of Ala- 

 bama. <^Proc. Acad. Nat. Sci., Phila., v\, pp. 109-110, No. 3, June and July, 

 1852. 2 cuts. 



Head before the Acaileniy Natural Sciences, Phila., June 1, 1852, and printed with miuutca 

 of June 29, 1852 (See Proc. Amer. Philos. Soc, v, p. 281.) 



Eschara Clairhornensis, Lea, n. s 110 



