GO BIBLIOGRAPHY OV PIII'.MOATIOXS OF ISAAC LEA, LL. D. 



1852. Lea, Isaac— Continuerl. 



Melania Saffordii, Lea, n. s., pi. xxj, fig. 10 300 



Lebanon, Wilson Connty, Tennessee, Mr. Jamos M. SafiFord. 

 Melania pinrjuis. Lea, n. s. , pi. xxx, fig. 11 301 



Lebanon, Wilson County, Tenn., Mr. J. M. Safford. 

 Melania gibbosa, Lea, n. s.,pl. xxx. fig. 12 301 



Scioto River, Ohio, Mr. C. M. Wheatley. 

 Systematic Index 302 



82. 



1852. Lea, Isaac. Description of a New Species of Helix, from California, and a 

 new Characteristic Form of certain American Colimaceic. <^Trans. Amer. 

 Philos. Soc. Phila., x, Part 3, 1852, pp. 303-305. 



Bead before the American Philosophical Society, March 5, 1852. With Net. 79 and 81 forms 

 No. 83. Seo No. 83. 



Outline of paper given, Free. Amer. Philos. Soc, v, 1852, pp. 252-253. 



Helix Leconlii, Lea, n. s., pi. xxx, fig. 13 303 



St. Francisco, J. L. Le Conte, M. D. 



Accessory Column in the Family Colimacea 304 



"When recently examining very closely the structure of some of out Helices, I ob- 

 served what had before escaped my attention, a pillar or an additional column, placed 

 like a fulcrum (buttress) in the interior, against the wall of the ordinary column, at the 

 distance of a fifth to a third of a revolution of the whorl from the aperture " 



"I have detected the fulcrum in the following species, and as several of the species of 

 Dr. Binney and Dr. Gould are unknown to me, I think it likely to bo found in some of 

 them: 



Caroeolla fpinosa, Lea. . Helix leporina, Gould. 



Carocolla Edgariana, Lea. Helix Lecontii, Lea. 



Helix hirsuta, Say. Polygyra Troostiana, Lea. 



» Helix inonodon, Racket. Folygyra Dorfuilliana, Lea." 



Helix Leai, Ward. 



On the use of personal names for species in natural history 305 



' 83. 



1852. Lea, Isaac. Observations | on the | Genus Unio, | together with | Descriptions 

 of New Species in the Families UnionidiP, Colimacea | and Melauiana. | Read 

 before the American Philosophical Society, and originally | published in its 

 Transactions. | by | Isaac Lea, | [Title] | with numerous plates. | Vol. V. | 

 Philadelphia : | Printed for the Author. 4°. pp. 02, with plates 12-30 of Vol. 

 X of the Trans. Amer. Philos. Soc. 



This consists of Nos. 79, 81, and 82, and was presented to the Academy Natural Sciences 

 Jtme 1, 1852. (See Proe. Acad. Xat. Sci. Phila., vi, p. xxii.) 



84. 



1852. Lea, Isaac. On the Fossil Foot-Marks in the Red Sandstones of Pottsville, 

 Schuylkill County, Penna. <CTravs. Amer. Philos. Soc. Phila., x. Part 2, pp. 

 307-317, plates 31, 32, and 33. 

 For separate see No. 85. 



Read before the American Philosophical Society, April 2,1852. Ordered to be published in 

 the Transactions of the Society', April 16, 1852. Part 2, vol. x of the Transactions laid before 

 the Society June 18, 1852. (See Proe. Amer. Philos. Soc., v, p. 275.) 



Remarks on the opinions of Prof H. D. Rogers and Prof. L. Agassjz on the character 



and age of these foot-prints 307-312 



Prof. Agassiz, aaseiting his belief before the Amer. Assoc. Adv. .Sci. that these were 

 not made by any air-breathing animal, Mr. Lea still holds to his "own opinions, as ex- 

 pressed in a former communication, as to the fact of these ' foot-inarks^ being impressed 

 by a four-footed air-breathing auim.al, allied to the 'Sanrians,' having four toes on the 

 hind foot and five on the fore foot." 



Remarks on foot prints that have been discovered analogous to those under dis- 

 cussion 312-314 



An extended diagnosis of the footprints of Sauropus primcBvua, plates xxxi and 



xxxii 314-316 



Description of other organic remains in the same formation, pi. xxxiii 316-317 



i 



