170 
very frequent occurrence at Tournai, but very rare in the Vise limestone. It 
is abundant in some shales in Ireland and Scotland. It is also found in the 
limestone of Settle and Bolland, Yorkshire, and Cosatchi-Datclii, Eussia; 
and, according to Mr. J. Hall, in that of Burlington (Iowa), He Quincy 
(Illinois), and Hannibal (Missouri), in North America. Mr. O. A. Herhy 
says it is much more abundant than any other species of Bracliiopod at 
Bonjardin and Itaituha, Brazil. In New South Wales it was found in a 
greyish limestone at Buchan, on the Gloucester Eiver, associated with Fro- 
ductus semireticulatus, Martin ; also at Burragood and Colocolo, in a greenish- 
grey, or brownish, argillaceous limestone. In these last-named localities the 
specimens are nearly all internal casts, easily determined by the impressions 
on the dorsal valve. 
Genus — EH YNCHONELLA, Fischer de Waldheim. 
Ehynchonella pleurodon, J. Fhillips} 
PI. IX, Pig. 4. 
A-Viomioe striatce, D. Lire, 1793, Hist. Eutherglen, p. 313, pi. 14, fig. 6. 
Terehratula tritoma, G. Pischer de APaldheim, 1809, Not. Poss. Gouv. Moscou, p. 34, 
pi. 2, fig. 7, 8, and 9. 
,, pleuvodon, J. Phillips, 1836, Geol. Yorkshire, II, p. 326, pi. 12, fig. 25-30 
(fig. 16 excluscV). 
Jlhynchonella pleiirodon , T. Davidson, 1861, Mon, Brit. Garb. Braeh., p. 100, pi, 23, fig. 
9-15 (fig. 10a excluscP). 
,, ,, L. G. de Koninck, 1872, Eech. Anim. Poss., II, p. 50 (for 
synonymy). 
This shell is of medium size, usually transversely oval, with more or 
less gibbous valves, furnished with a variable number of sharp radiating plica- 
plications, originating at the beaks. These plications are separated from each 
other by furrows that are deep and angular for the greater part of their length. 
The mesial plications are nearly straight, but the lateral plications are more or 
less curved, according to their position. The beak of the ventral valve is small, 
very slightly incurved, and not prominent ; immediately below its pointed ex- 
tremity is the deltidium, pierced by a small circular foramen. The ventral 
furrow is generally rather broad, and composed of four mesial plications, 
separated from the lateral plications by a more strongly developed plication. 
' [Viile R. Etheridge, Jiinr., Gecsl. and Pal. Q’land., 1892, ji. 244. t. 11, f. 23. — W.S.D.] 
