154 BRITISH CARBONIFEROUS BRACHIOPODA. 



To the typical forms of this variety we have united certain specimens from Corrieburn, 

 of which the figs. 18 and 14 of our plate are representations; but it is desirable, at the 

 same time, to mention that the Corrieburn specimens are remarkable on account of the 

 narrowness or smallness of their ribs, none much exceeding half the width of those of 

 Phillips's type j and as the general form of the shell in both, as well as the arrangement of 

 the spines, is similar, I have not ventured to apply to it a separate specific denomination, 

 although it may possibly be distinct. One of the principal differences observable in P. 

 muricatm lies in the ventral valve being regularly convex, and the dorsal one regularly 

 concave, while in all well-shaped examples of P. costatm the valves are generally somewhat 

 obscurely geniculated. The interior of P. muricatm is still unknown, but the dorsal valve 

 of P. costatm has been found several times, and does not differ in its details from what we 

 observe in other Producta. 



P. costatm has been obtained from the Carboniferous limestone of several English 

 localities, such as Settle and Richmond, in Yorkshire ; at Bolland ; in the dark Car- 

 boniferous limestone of Lowick, Northumberland, &c. In Scotland it has been found at 

 Hillhead, and Brockley, in Lanarkshire; Barrhead, in Renfrewshire; Roughwood and 

 West Broadstone, &c. In Ireland, in the upper limestone of Old Leighlin. 



Prof, de Koninck states in his ' Monographic' that he has not discovered the species in 

 Belgium, but I possess a specimen from Vise identical in shape and character with many 

 of our British forms. In Russia it occurs in the Carboniferous limestone of the neigh- 

 bourhood of Sloboda, Government of Toula, also of Botcharova, on the Volga, &c. In 

 the limestone of St. Louis, in the Missouri, America, very abundant and unusually large ; 

 in the Punjaub, &c. 



The variety P. muricatus is stated by Phillips to occur at Harelaw and Kirby Lonsdale. 

 In Scotland it has been found at Cessnock, and Gateside Beith, in Ayrshire, at Corrie- 

 burn, in Stirlingshire, and Castlecary, in Dumbartonshire. 



Productus longispinus, Sowerby. PI. XXXV, figs. 5 — 17. 



Anomi^e echinat^e (pars),t/n?. History of Rutherglen, p. 314, pi. xv, figs. 3, 4, 1793. 

 Productus longispinus, Sow. Min. Conch., vol. i, p. 154, pi. Ixviii, fig. 1, October, 



1814. 



— Flemingii, Sow. lb., fig. 2. 



— spinosus, Sow. lb., pi. lxix, fig. 2, 1814. 



— lobatus, Sow. lb., pi. 318, figs, 2—6, 1821. 



— elegans, Davreux. Const. Geol. de la Prov. de Liege, p. 272, 1833 (ac- 



cording to De Koninck). 



— setosa, Phillips. Geol. of Yorkshire, vol. ii, pi. viii, figs. 9 and 17, 1836. 



— lobatus, V. Buch. Verhandl. der Konigl. Akad. der Wissens. zu Berlin, 



aus dem jahre, Theil. i, p. 32, pi. ii, fig. 17, 1841. 



— Capacii, D'Orb. Paleont. du Voyage dans l'Amerique Me'ridionale, pi. iii, 



figs. 24—26, 1843. ; 



