﻿STROPIIALOSIA. 



97 



Sub- Gen us — Stro pii a los i a, King . 

 Strophalosia productoides, Mureh. PI. XIX, figs. 13 — 21. 



Orthjs productoides, March. Bull. Soc. Geol. de France, vol. xi, p. 254, pi. ii, fig. 

 7, 1840. 



Productus spinulosis, V. Buck. Archiv fur Mineral. &c, vol. xv, p. 38, non Sow., 



1840. 



— — D'Eichwald. Bull. Sc. de l'Academie des Sciences de St. 



Petersb., p. 86, 1840. 



Lept.ena caperata, J. de C. Sow. Trans, of the Geol. Soc. of London, 2nd ser. 



vol. v, p. 704, pi. liii, fig. 4, pi. liv. fig. 3, 1840. 



— — Phillips. Pal. Fossils of Cornwall, Devon, &c, p. 58, pi. xxv, 



fig. 98, 1841. 



— laxispina, Phillips. Ibid., p. 59. pi. xxv, fig. 99. 



— mem br an ace a, Phillips. Ibid., p. 60, pi. xxv, fig. 101. 



Productus spinulosus, V. Buch. Abhandi. der Konigl. Akad. der Wissens. zu Berlin, 

 Thei). i, p. 27, pi. ii, fig. 16, non Sow., 1841. 



— — De Kon. Desc. des An. Foss. du Terrain Carb. de Belgique. 



p. 183, pi. xiii bis, fig. 4 (not Sow.), 1843. 



— productoides, De Verneuil. Russia and the Ural Mount., vol. ii, p. 283, 



pi. xviii, fig. 4, 1845. 

 — '• membranaceus, De Verneuil. Ibid., p. 285, pi. xv, fig. 11. 



— subaculeatus (partim) De Keyserl. Reise in das Petschora-land, p. 199, 



pi. iv, figs. 1, 2, 1846. 



— Murchisonianus, De Kon. (part). Mon. du Genre Productus, t. iv, des 



Memoires de la Soc. Royale des Sciences de Liege, 

 p. 245, pi. xvi, fig. 3/ (not fig. 3 «■ «, c <f, «, ), 184/ ; 

 Monographe des Genres Productus et Chonetes, 

 p. 138, pi. xvi, fig. 3 f> 1847. 

 Lept.ena caperata, M'Coy. Brit. Pal. Foss., p. 388, 1852. 



Spec. Char. Shell sub-orbicular, or transversely semicircular ; binge-line somewhat 

 shorter than the width of the shell ; ventral valve moderately and evenly convex, regularly 

 arched, without sinus ; beak very small, hardly conspicuous ; area triangular, flat, rather 

 narrow, and divided in the middle by a small pseudo-deltidium. Dorsal valve concave, 

 following the curves of the opposite one ; hinge-area almost linear, and much narrower 

 than that of the dorsal valve. Surface of ventral valve marked by fine, contiguous, con- 

 centric, undulating, irregular, and interrupted wrinkles, as well as numerous spine 

 tubercles, or long, slender, sloping spines, arranged somewhat in quincunx. A row of 

 erect spines are situated close to the cardinal edge. The surface of the dorsal valve is 

 also marked with wrinkles and small pits. Interior unknown. 



Length 1 inch ; width 1 inch 1 line ; depth 2 lines. 



Obs. This interesting species was, by Sir R. Murchison, published on the 6th of 



N 



