ON THE FOSSIL PHYLLOPODA OF THE PALiEOZOIC ROCKS. 67 



Goldenber?, in his ' Foss. Thiere Sfceinkohl. Saarbrucken,' Heft. II. 

 1877, redescribed, with some figures, L. Leidyi and varr. Williamsoniana 

 and Salteriana, Jones, p. 45, t. 2, f . 22, 33, adding an account of other forms. 



In 1879 R. Btheridge, jnn., gave a synopsis of the foregoing genus 

 and species, with full references, in the 'Ann. Mag. Nat. Hist.,' ser. 5 

 vol. iii. p. "262, with the addition of the species L. Jonesii. 



All the known species of Leaia have been found in the Carboniferous 

 series or in strata in close apposition above or below, as shown in the 

 following list : — 



1. 1862. — Goal-measures of South "Wales, and the Lotvest-Carhoni- 

 ferous or Uppermost-Devonian of Pennsylvania. 



Leaia Leidiji (Lea), Jones, 'Monogr. Foss. Esth. Pal. Soc.,' 1862, 

 Appendix, p. 116, pi. 5, f. 11, 12. Figured also by Laspeyres and 

 Goldenberg. 



2. 1862. — Goal-measures near Manchester and South "Wales. 



Leaia Williamsoniana, Jones. As a variety of L. Leidyi, ibid. 

 p. 117, pi. 1, f. 19, 20. Figured also by Gokieuberg. 



3 1862. — Goal-meastires of South "Wales (?), and Lower Garboniferous 

 of Fife. 



Leaia Salteriana, Jones. As a variety of L. Leidyi. Ibid. p. 119, 

 pi. 1, fig. 1. Figured also by Laspeyres and Goldenberg. 



In the ' Geol. Mag.,' vol. vii. 1870, p. 219, doubts were expressed 

 as to these forms being specifically distinguishable, but in view of H. 

 Laspeyres' careful conclusions it may be right to treat the so-called 

 varieties as distinct species. 



4. 1864. — Lower Permian ('Lower Dyas ') ; "Werschweiler, near 

 Neunkirchen, not far from Saarbriioken, in the Treves district, Rhenish 

 Prussia. 



Leaia Bcentschiaua, Beyrich and Geinitz, was so named as a variety 

 of L. Leidyi by Beyrich, and as a species by Geinitz independently in 

 1864; Beyrich's note, ' Zeitschr. deutsch. geol. Gesellsch.,' vol. xvi. 

 1864, p. 364, bearing a ratlier earlier date than Geinitz's descriptive note 

 in the ' Neues Jahrb.,' 1864, p. 657, and his fuller description in the 

 ' N. Jahrb ,' 1865, p. 389, t. 2, f. 2 a, a, & 3 a, a. 



In his paper on "Von Dcchen's Geological Map of the Saai'briicken Coal- 

 field, &c , Dr. Weiss first noticed this fossil as being either a Fosidonomya 

 or an Estheria, of a peculiar goose-foot shape, ' N. Jahrb.,' 1864, p. 656. 



In 1870 this species was carefully redescribed and well figured by 

 H. Laspeyres, 'Zeitschr. d. g. Ges.,' vol. xxii. p. 744, t. 16, f 2, as L. 

 Bainfscliiana. 



In 1873 and 1877 M. Goldenberg included this interesting fossil in 

 his ' Fauna Sartepontana fossilis,' Heft I. p. 24, t. 1, f. 20, 21, and Heft 

 II. p. 46, t. 2, f. 24, as a variety of L. Leidyi. 



In his 'Handbuch der Palaontologie,' vol. i. Part 8, 1885, p. 568, fig. 

 758, Zittel gives both Leaia Leidyi, J. (after Jones), and L. Bcentschi- 

 aua, Geinitz (after Goldenberg), but they are wrongly referred to in 

 the text. 



5. 1868. — Goal-measures. Illinois. Lenia tricarinafa, Meek and 

 "Worthen, ' Geol. Survey Illinois,' vol. iii. Geology and Palteontology, 

 pp. 541^3, woodcuts on p. 540 (with Golpocaris), tigs. Bl, B2, B3, and C. 



6. 1870. — Goal-measures. "Wettin, Prussian Saxony, on the Saale. 

 Leaia Wettinensis, Laspeyres, ' Zeitschr. deutsch. geol. Gesellsch,,' vol. 

 xxii. p. 745, t. 16, f. 1 ; ' N. Jahrb.,' 1870, p. 922. 



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