177 
of Diiiivegan, and in the sandstone forming the summit of a hill one mile 
south of Trevallyan. All the specimens sent hy Mr. W. B. Clarke come 
from Burragood, on the Paterson. 
Spirifee, glaber, tv. Martin. 
PL XI, Pig. 8, and PL XII, Pig. 1.* 
CouchjUoUtJms anomites glaher, W. Martin, 1S09, Petrif. Derbienaie, p. II, pi. 48, fig. 
9, 10. 
Spirifer glaher, J. Sowerby, 1821, Min. Conch., Ill, p. 123, pi. 2G9, fig. 1, 2. 
5 s j 5 L- Gr. de Koninclv, 1843, Descr. Anim. Poss. Terr. Carb. Belg., p. 2G7. 
pi. 18, fig. 1. 
Spirifera suhradiata, G-. Sowerby, 1844, in Darwin’s Geol. Obs. Vole. Islands, p. 158. 
Spirifer suhradiatus, J. Morris, 1845, in Strzelecki’s Phys. Descr. X. S. Wales and V. D. 
Land, p. 281, pi. IG, fig. 1-4 (pi. 15, fig. 5 exclusa). 
Spirifera Sllhradiata^(J var. resembling Spirifera glahrd), P. McCoy, 1847, Ann. Mag. 
Xat. Hist., XX, p. 233. 
Spir fer glaher, J. D. Dana, 1849, Geol. Wilkes’ U. S. Explor. Exped., p. 683, pi. 1, 
fig. 6. 
Spirifera glabra, T. Davidson, 1859, Mon. Brit. Carb. Brack., p. 59, pi. 11, fig. 1-9, 
and pi. 12, fig. 1-5, ]1 and 12. 
5 , ,, J. W. Dawson, 1868, Acad. GeoL, p. 211, fig. 89. 
Spir fer glaher, L. G. de Koninck, 1872, Eecb. Anim, Poss., II, p. 57, pi. 2, fig. 12 
(for synonomy). 
This shell is very variable in shape and proportions, and can acquire very 
large dimensions. It is usually transversely oval, rather thick, rarely longer 
than broad. Its valves are regularly ventricose, and of nearly equal depth. 
The beak of the ventral valve is thick, and strongly incurved upon itself, but 
scarcely projects beyond the plane of the hinge area. The hinge area is 
small, triangular, and nearly flat, provided with a triangular deltoid fissure, 
partly covered by a pseudo-deltidium. The ventral furrow is more or less 
well marked, the depth varying with the age and dimensions of the indi- 
viduals, occasionally showing a faint longitudinal furrow at the bottom. 
The dorsal ridge of the dorsal valve, though generally regularly curved, is 
^ [The form figured here is now referred to Waagen’s genus or subgenus Martiniojisis, and is known as 
Martiniopsis suhradiata, G. Sby. Vide R. Etheridge, Junr., Geol. and Pal. Q’land, 1892, pp. 236-239, t. 11, 
f. 14.— W.S.D.] 
