ON THE FOSSIL PHYLLOPODA OF THE PALHOZOIC ROCKS. 339 
The Synonyms of Crratiocaris Murcuisont (Agassiz), 1839 :— 
1839. Onchus Murchisoni, Agassiz in ‘ Silur. Syst.’ p. 607, pl. 4, fig. 10 (not figs. 9 and 
11); and Onchus, fig. 63 2, and Ichthyodorulite, fig. 64. 
1851. Leptocieles (Murchisoni), M‘Coy. ‘ Synops. Brit. Palseoz. Foss.’ fasc. 1, p. 176. 
» 1853. Leptocheles Murchisoni (Agass.), M‘Coy. ‘Quart. Journ. Geol. Soc.’ vol. ix. p. 13 
(omitting allusion to figs. 9 and 11, ‘ Sil. Syst.’). 
1854. Leptocheles Murchisont (M‘Coy), Murchison. ‘Siluria,’ 1st ed. p. 236, pl. 19, figs. 
1, 2, and sp. fig. 3. 
1859. Leptocheles Murchisoni (M‘Coy), Murchison. ‘Siluria,’ 2nd ed. (3rd including 
‘Sil. Syst.’), pp. 263, 538, pl. 19, fig. 1 (2 and 3 2). 
1860. Ceratiocaris Murchisoni (M‘Coy), Salter. ‘Ann. Mag. Nat. Hist.’ ser. 3, vol. v. 
. 157. 
1866. Diretiosaris Murchisoni, H. Woodward. ‘Geol. Mag.’ vol. ii. p. 205, pl. 10, 
figs. 8 and 9. 
1867. Leptocheles Murchisoni (M‘Coy). Salter, in ‘ Siluria,’ 4th ed. including ‘Sil. 
Syst.’ p. 134, pl. 19, figs. 1 and 2. 
1867. Leptocheles (Ceratiocaris) Murchisoni (M‘Coy). Salter, in ‘Siluria,’ 4th ed. 
p. 237, pl. 19, fig. 1 (2, 3¢). 
1867. Ceratiocaris Murchisoni (Agass.), Salter, in ‘ Siluria,’ 4th ed. p. 516, pl. 19, 
figs. L and 2. 
1877. Ceratiocaris Murchisoni (M‘Coy), H. Woodward. ‘Catal. Brit. Foss. Crust.’ 
er: 
1884. SF spoarts Pardoensis, La Touche. ‘Geology of Shropshire,’ p. 77, pl. 17, 
fig. 563. 
1884. Piatiocaris leptodactylus, La Touche. ‘Geology of Shropshire,’ p. 77, pl. 17, 
fig. 566 (young C. Murchisoni). 
The Synonyms of Cerrariocaris LEPropactyLus, M‘Coy, founded on 
certain slender tail-spines, which may have belonged to a varietal form of 
0. Murchisoni (Agassiz) :—- 
1849, Pterygotus leptodactylus, M‘Coy. ‘Ann. Mag. Nat. Hist.’ ser. 2, vol. iv. p. 
394. 
1851. Pterygotus leptodactylus, M‘Coy. ‘Synops. Brit. Palzoz. Foss.’ fasc. i. p. 176, 
pl. 1H, figs. 7, 7a, 7b (not figs. 7c, 72). 
1853. Leptocheles leptodactylus, M‘Coy. ‘Quart. Journ. Geol. Soc.’ vol. ix. p. 13. 
1859. Leptocheles leptodactylus (M‘Coy), Murchison. ‘ Siluria,’ 2nd (3rd) ed. pp. 
263, 538. 
1860. Ceratiocaris leptodactylus (M‘Coy), Salter. ‘Ann. Mag. N. H.’ ser. 3, vol. v. 
p. 157. 
1867. Leptocheles (Ceratiocaris) leptodactylus (M‘Coy). Salter, in ‘ Siluria, 4th ed. 
(including ‘ Sil. Syst.’), p. 237. 
1867. Ceratiocaris leptodactylus (M‘Coy). Salter, in ‘ Siluria,’ 4th ed. (including < Sil. 
Syst.’), p. 516. 
1873. Ceratiocaris leptodactylus, Salter. ‘ Catal. Camb. Sil. Foss.’ p. 164. 
Taking Mr. Salter’s description of the carapace of ‘ leptodactylus’ and 
the appendages of ‘Murchisoni’ as really both belonging to the latter, and 
the more slender caudal spines (leptodactylus of M‘Coy) as belonging to 
a variety of the latter, we have looked for the two-inch oblong carapace 
which Mr. Salter thought he had found for Murchisoni (‘ Ann. Mag. Nat. 
Hist.’ /.c.), but we have not met with it at Ludlow, as led to expect by 
his remarks ; nor is it in the Museum of Practical Geology, to which also 
he refers us. Indeed, we cannot help thinking that some confusion of 
the specimens is hereby indicated. 
The carapace of C. Murchisoni (as defined by us) is pyriform, or 
acutely subovate, deep behind, narrow in front; gently convex on the 
back ; outlined by a bold elliptical curve on the ventral margin, which 
Tises up to form with the dorsal edge a sharp angle in front, above the 
Z2 
