172 BRITISH CARBONIFEROUS BRACHIOPODA. 



known, and appears to present certain peculiarities which have been carefully represented in 

 the figures of my plate. Thus, the adductor muscular impressions are very much produced, 

 and form two pairs of contiguous projections, separated by a short median ridge which extends 

 to nearly the centre of the valve, where it becomes much elevated, with a depression or pit on 

 either side, margined by a vertical wall, as in Strophomena analoga and some other species. 

 The reniform impressions are also much more oblique in their direction than is usual to the 

 species of this genus. In the greater number of specimens the spiniferous ridges are 

 separated by almost smooth spaces, but in some rarer examples the tubercules or spine- 

 bases are so much elongated as to give the surface somewhat the appearance of certain 

 examples of P. scabriculus. 



P.fimbriatus is not uncommon in the Carboniferous limestone of Derbyshire, of Lowick, 

 Northumberland ; limestone and shale of Settle, in Yorkshire ; Bolland ; Poolwash, Isle 

 of Man, &c. In Scotland at Hillhead, at Middleholm, Lanarkshire ; Gateside and West 

 Broadstone Beith, Ayrshire ; in Fifeshire, &c. In Ireland, at Little Island, Bundoran, 

 Tornaroan, &c. In Belgium it is common in the lower stage of the Carboniferous system 

 of Vise, rare in that of Chockier ; and has been found also at Sterlitamak, in Russia, &c. 



Productus punctatus, Martin. PI. XLIV, figs. 9 — 16. 



Anomites punctatus, Martin. Petrif. Derb., pi. xxxvii, fig. 6 (7, S exclusa), 1809. 

 Trigonia rugosa, Parkinson. Organ. Remains, vol. iii, pi. xii, fig. 11, 1811. 

 Anomites thecarius, Schloth. Nachtr. zur Petrefactenk, pi. xiv, fig. 1, 1822. 

 Productus punctatus, J. Sow. Min. Conch., t. 323, Jan., 1822. 

 Producta punctata, Phillips. Geol. of York., vol. ii, pi. viii, fig. 10, 1836. 

 Leptcena sulcata, Fischer. Oryct. du Gouv. de Moscou, pi. xxiii, fig. 2 (non Sow.), 1837. 

 Productus punctatus, V. Bitch. Abhandi. der K. Akad. der Wissens. zn Berlin, Thiel. i, 



pi. ii, figs. 10, 11, 1841. 



— — De Kon. Desc. des Animaux foss. du Terr. Carb. de Belgique, 



pi. viii, fig. 4 ; pi. x, fig. 2; pi. ix, fig. 4, 1843 ; and Mon. du 

 genre Productus, pi. xii, fig. 2, 1847. 



— concentuicus, Potiez et Michaud. Galer. des Mollusques du Mus. de Douai, 



vol. ii, p. 25, pi. xii, fig. 1, 1844. 



— punctatus, Be Fern. Russia and the Ural Mountains, vol. ii, pi. xvi, fig. 11. 



1845. 



— tubulospina, M'Chesneyl Desc. of New Species of Fossils from the Palaeozoic 



Rocks of the Western States, p. 37, 1859. 



— punctatus, Dav. Scottish Carb. Mon., pi. iv, fig. 20, 1860. 



Spec. Char. Shell thin, variable in shape ; transversely rotundato-quadrate, or slightly 

 clono-ated oval : hins;e-line shorter than the width of the shell. Ventral valve convex, 

 sometimes gibbous, with a shallow, longitudinal, mesial depression or sinus, commencing at 

 a short distance from the extremity of the beak and extending to the front ; beak incurved, 

 overlving the hinge-line at its attenuated extremity ; ears flattened, but slightly defined. 



