PllODUCTUS. L39 



18. Productus scabricnlus, Martin. 



19. — pustulosus, Phillips. 



20. — Jimbriatus, Sowerby. 

 var. laciniatus, M'Coy. 



2. Spinosi J ) 2L ~ punctatus, Martin. 



var. elegans, M'Coy. 



,2. — ■ aculeatus, Martin. 



'3. — Young ianus, Davidson. 



1. Key serliny ianus, De Koninck. 



!5. — spinulosus, J. Sowerby. 



!6. — mesolobus, Phillips, 



j 27. — plicatilis, Sowerby, 



28. — sublavis, De Koninck. 



Productus striatus, Fischer. Plate XXXIV, figs. 1,-5. 



Productus comoides, Dillwyn. An Index to the Hist. Conch, of Lister, p. 24 (not 



of Sow.), 1823. 

 Mytilus striatus, Fischer. Oryct. du Gouv. de Moscou, p. 181, pi. xix, fig. 4, 1830. 

 Pinna inflata, Phillips. Geol. of Yorkshire, vol. ii, pi. vi, fig. 1, 1836. 

 Pecten tenuissimus, Eichwald. Bullet. Scient. de l'Acad. de St. Petersburg, vii ; 



p. 86, 1840. 

 Lima Waldaica, V. Buck. Kersten's Archiv fur Min. Geogn., &c, p. 60, 1840. 

 Leptcena anomala, J. de C. Sow. Min. Conch., vol. vii, pi. 615, fig. 1, a, c, d (not 

 1 b, which belongs Streptorhynchus crenistria, var. senilis), 

 18-41- 

 PitODUCTUS lim.efor.mis, V. Buch. Abhand. der Konigl. Akad. der Wissens. zu Berlin' 



aus dem Jahre, Theil. i, p. 22, pi. i, figs. 4, 5, and 6, 

 1841. 



— striatus, I)e Kon. Desc. des Anira. Foss. du Syst. Carb. de Belgique, 



pi. vi, fig. 10, and pi. viii bis, fig. 4, 1843. 

 — De Verneuil. Russia and the Ural Mountains, vol. ii, p. 254, 

 pi. xvii, fig. 1, 1845. 



— — De Keyserliny. Reise in das Petschoraland, pi. iv, fig. 8, 8a, 



and 8b, and pi. v, fig. 1, 1846. 



— — De Kon. Mon. du genre Productus, pi. i, fig. 1, a — d, 1847. 

 Strophalosia striata, Morris. Catalogue, p. 155, 1854. 



Productus striatus, M'Coy. British Pal. Fossils, p. 473, 1855. 



Spec. Char. Shell thin, exceedingly variable in shape, and often irregular; usually 

 much elongated, triangular, with acuminated beak and rounded front ; or broad, transversely 

 semicircular ; hinge-line always shorter than the width of the shell, sometimes exceedingly 

 so. Ventral valve moderately convex, rarely gibbous, without sinus ; beak pointed, rarely 



a glance at the figures will, I trust, remove all uncertainty. In order not to unnecessarily burden the list 

 of references, I have many times purposely omitted to allude to those catalogues or works in which the 

 species are named, but not illustrated. 



