262 
On a small and new Phyllopod Crustacean. 
The following synopsis of the species of Leaia known to 
me may be found useful:— 
Genus Leaia, Jones, 1862. 
Leaia Leidyi , Lea (1856). 
Cypricardia Leidyi , Lea, Proc. Acad. Nat. Sci. Philad. 1856, vii. p. 341, 
t. 4. 
Leaia Leidyi , Jones, Mon. Foss. Estkerise, 1802, p. 116, t. 5. f. 11, 12 ; 
Dawson, Acadian Geol. 1868, p. 256, f. 78 c; Jones, Proc. Nat. Ilist. 
Soc. Cardiff, 1869, ii. p. 117, t. 3. f. 11—14; Jones, Geol. Mag. 1870, 
vii. p. 219, t. 9. f. 11-14 ; Laspeyres, Zeitsclir. deutsch. geol. Gesellsch. 
1870, xxii. p. 740, t. 16. f. 3; Miller, Cat. American Pal. Foss. 1877, 
p. 219; Woodward, Cat. Brit. Foss. Crustacea, 1877, p. 76; Golden- 
berg, Fauna Saroepontana Foss. Heft 2, 1877, p. 45, t. 2. f. 22; 
Bigsby, Tlies. Dev.-Carbonif. 1878, pp. 250, 251. 
Loc. and Horizon. Tumbling-Run dam, near Potsville 
(Penn.), in the uppermost portion of the Old Red Sandstone 
(?or base of the L. Carboniferous) ; Coal Measures of South 
Wales. 
Leaia Leidyi , var. Williamsoniana : Jones (1862). 
Bivalvular shell, Williamson, Phil. Mag. 1836, n. s. ix. p. 351. 
Aptychus ?, Phillips, Murchison’s Sil. Syst. 1839, p. 89. 
Leaia leidyi, var. TVilliamsoniana, Jones, Mon. Foss. Esther!®, 1862, 
p. 117, t. 1. f. 19-29; Woodward, Cat. Foss.Crustacea, 1877, p. 76; 
Goldenberg, Fauna Saraepontana Foss. Heft 2, 1877, p. 45, t. 2. 
f. 23 ; Bigsby, Thes. Devon.-Carbonif. 1878, p. 251. 
L. Williamsoniana, Laspeyres, Zeitschr. deutsch. geol. Gesellsch. 1870, 
xxii. p. 743, t. 16. f. 4. 
Loc. and Horizon. Ardwick, near Manchester, in upper¬ 
most portion of Coal-measures. 
Leaia Leidyi , var. Salteriana , Jones (1862). 
L. Leidyi, var. Salteriana, Jones, Mon. Foss. Estheriae, 1862, p. 119, 
t. l.f. 1; Woodward, Cat. Foss. Crustacea, 1877, p. 76; Golden¬ 
berg, Fauna Saraepontana Fossilis, Heft 2, 1877, p. 45; Bigsby, 
Thes. Dev.-Carbonif. 1878, p. 251. 
L. Salteriana, Laspeyres, Zeitschr. deutsch. geol. Gesellsch. 1870, xxii. 
p. 744, t. 16. f. 5. 
Loc. and Horizon. Cottage Row, Crail, Fife, in rocks of 
the Lower Carboniferous or Calciferous Sandstone series. 
Leaia Bcentschiana , Geinitz (1864). 
L. Bdntschiana, Geinitz, N. Jakrbuch, 1864, p. 657; id. ibid. 1865, 
p. 389, t. 1. f. 2, 3. 
L. Leidyi , var. Bdntschiana, Beyrich, Zeitschr. deutsch. geol. Gesellsch. 
1864, xvi. p. 364. 
L. Bcentschiana, Laspeyres, Zeitschr. deutsch. geol. Gesellsch. 1870, xxii. 
p. 744, t. 16. f. 2. 
