228 BRITISH SILURIAN BRACHIOPODA. 
Abroad it has been found in Ostrogothia, Sweden, and, according to Méneghini, in 
the Island of Sardinia. It occurs also in the Trenton Limestone in the State of New 
York, and, according to Mr. Salter, at Allumette Island, in Canada, &c. 
Orruis Epegiiiana, Salter, MS. Pl. XXXII, figs. 1—4. 
Spec. Char. Marginally almost circular, rather wider than long, greatest width about 
the middle ; hinge-line shorter than the breadth of the shell. Ventral valve moderately 
and uniformly convex, without any fold or sinus; beak small, slightly produced and 
incurved ; area triangular, about one fourth as broad as long, fissure narrow. Dorsal 
valve semicircular, not quite as deep as the opposite one, gently convex, most so at the 
umbone, but divided longitudinally mto two lobes by a mesial depression or sulcus ; hinge- 
area narrow. Surface of both valves ornamented by the means of numerous strongish 
ribs, which radiate from the extremity of the beaks to the margin, while between each 
two of the principal costa are interpolated one, two, or three smaller ones, so that the ribs 
appear as if arranged in clusters, the largest one in the middle being the most elevated. 
A few concentric lines, more or less deeply indented, intersect the radiating riblets. Shell 
distinctly punctated. ‘Two specimens measured— 
Length 10, width 12, depth 5 lines. 
Sit TAO eee els east Gul 5, 
Obs. This species does not appear to have ever much exceeded one inch in length: 
the ribs are much smaller and closer in some specimens than in others: some ex- 
amples also have their valves more convex than others. The interior presents the 
general features of the genus Orthis, as will be seen by a glance at figs. 3 and 4 of 
Pl. XXXII. 
Position and Locality. O. Edgelliana was discovered for the first time by Mr. Wyatt- 
Hdgell in the Upper Wenlock beds at Garcoed, near Usk, where it appears to be 
tolerably abundant. It received from Mr. Salter the MS. name by which it is here 
recorded. 
Ortuis Menaria, Hicks, MS. Pl. XXXIITI, figs. 8—12. 
Ortuis MrnapPi#, Dav. Geol. Mag., vol. v, p. 314, pl. xvi, figs. 24—28, 1868. 
Spec. Char. 'Yruncato-orbicular, rather wider than long; hinge-line a little shorter 
than the greatest width of shell. Dorsal valve semicircular, somewhat indented in front, 
slightly convex, with a longitudinal depression or sulcus along the middle ; area narrow and 
divided by a triangular fissure. Ventral valve rather deeper than the opposite one, with a 
rounded longitudinal ridge or elevation commencing at the extremity of the small incurved 
