334 BRITISH SILURIAN BRACHIOPODA. 



notice. During a visit to London, Dr. Lindstroiu recognised in the Museum of Practical 

 Geology British specimens agreeing with Angelin's shell, labelled " Chonetes IcBvigata or 

 lepisma, Sow," ^^ 



I regret that no interiors should have yet turned up ; but the row of spines on the 

 cardinal edge is sufficient to denote that the place of this shell is with Chonetes. Both 

 Sovverby's and Angelin's specimens are also remarkable on account of their glistening or 

 nacreous surface. Chonetes lepisma. Sow., sp., bears some resemblance to the Carboniferous 

 Chonetes polita, M'Coy (see my ' Carb. Mon.,' p. 190, pi. xlvii, figs. 8, 11) ; but in the 

 latter the beak is more projecting, the hinge-line longer, and the ventral valve more convex 

 or keeled along the middle. 



Position and Locality/. This species occurs in the Lower Ludlow rock at Garden 

 House Quarry, Aymestry, from which locality Murchison's original example (in tlie 

 Museum of the Geological Society) was obtained. It is found also in the Aymestry 

 Limestone at Malvern. 



Abroad it has been collected by Prof. Angelin and Dr. Lindstrom in the Island of 

 Gothland. 



CnOiNETES (?) MiiNiMA, 8ow. (sp.) PI. XLIX, flgs. 15 — 19. 



LEPTiENA MINIMA, J. de C. Sow. Sil. Syst. pi. xiii, figs. 4, 4 a, 1839. 



— — Dav. London Geol. Journ., vol. i, p. 59, pi. xii, fig. 29, 184/. 



— Grayii, Id. Bui. Soc. Geol. France, ser. 2, vol. vi, p. 2/1, fig. 1, 1849. 



— ? MINIMA, M'Coy. Brit. Pal. Foss., p. 235, 1852. 



— ~ Salter. ' Siluria,' 2ud ed., pi. xx, fig. 16, 1859. 



— GiiATii, Etheridge. Catal. Coll. Foss. Mus. Pract. Geol., p. 41, 1865. 



Spec. Char. Shell minute, semicircular, wider than long, hinge-line nearly or quite 

 as long as the width of the shell ; cardinal extremities acutely or obtusely angular. 

 Ventral valve moderately convex, flattened at the ears ; area triangular, moderately wide ; 

 fissure small, arched over by a pseudo-deltidium ; beak not projecting. Dorsal valve 

 slightly concave, flattened near its cardinal extremities ; hinge-area very narrow. Surface 

 of both valves marked with from ten to twenty principal prominent radii, with a wide 

 interspace and a median shorter and smaller riblet between each pair. The radii are 

 rather irregular, some being larger and closer than others. Interior not well known ; in 

 the dorsal valve the muscular impressions are scarcely visible on either side of a slightly 

 ])rojecting mesial ridge. The inner surface is also marked by numerous rather large and 

 projecting tubercles. 



Length of a large specimen 2, width 2^, depth jth line ; the shell is usually 

 smaller. 



