160 
development of its hinge area. Young individuals resemble C. dalmaniania, 
L. G. de Koninck, but can be distinguished from it by being relatively less 
elongated, by the angles of its ears, and by the different number of ribs in a 
given space.’^ 
Horizon and Localities , — Chonetes papilionacea, Pbillij)s, belongs 
exclusively to the upper l)eds of the Carboniferous System. It is rather 
common in the Cbokier Limestone, but rare in that of Vise. Mr. Julien 
found it in the slate quarries of the valley of Sichon, near Vichy. I have a 
beautiful specimen of it from Karowa, Province of Kalouga, near Moscow. 
J. Ph illi ps found it at Bolland and Settle, Yorkshire. It oecurs near Dublin, 
and in other localities in Ireland and England, and at Sable, Prance. Mr. 
W. B. Clarke found it at Dungog, on the Williams Biver, in a grey oolitic 
limestone, composed of innumerable small black grains in a clear grey base. 
Chonetes laguessiana, L. G. de Koninch? 
PI. X, Pig. 7. 
Lecten, D. Ure, 1793, Hist. Eutherglen, p. 317, pi. 16, fig. 10, 11. 
Chonetes laguessiana, L. G-, de Koninck, 1843, Descr. Anim. Poss. Terr. Carb. Belg., p. 211, 
pi. 12 bis, fig. 4. 
,, hardrensis, T. Davidson, 1861, Mon. Brit. Carb. Brack., p. 186, pi. 47, fig. 12-18 
(not Phillips). 
,, cracowensis, R. Etheridge, 1872, Quart. Jonrn. Greol. Soc., XXVIII, p. 336, 
pi. 18, fig. 2. 
,, laguessiana, L. G. de Koninck, 1873, Bech. Anim. Poss., II, p. 39, pi. 2, fig. 2t 
My deseription of this fossil, published in 1872, gives its characteristics 
so clearly that I will not repeat them here, nor my reasons for considering it 
essentially different from the Devonian species figured by J. Phillips under 
the name C. hardrensis . I must say that my recent fresh examination of 
the fossil has confirmed me in my opinion. I am also convinced that the 
C. cracoioensis of Mr. B. Etheridge differs in no essential point from my C. 
laguessiana, but is identical with it. 
^ Mr. McCoy errs in making me state that these differences exist between G. comoides and 0. papilionacea. 
He has confounded page 294 in my Monogra^ihie des Chonetes with page 292, as he can easily see by reference 
to it. 
^ A complete Synonymy and detailed description are given in this work. 
^ [Mr. R. Etheridge, Junr., considers that the Queensland C. cracoivensis\\e.Ye placed under G. laguessiana 
is a distinct species. Geol. & Pal. Q’land, 1892, p. 262, t. 13, f. 9. This confirms Waagen’s opinion. Salt Range 
Fossils (Pal. Indica), 1891, IV, Pt. 2, p. 132. — W.S.D.] 
