BRACHIOPODA. 
333 
Genus PROBOSCIDELL A, (Ehlert. 1887. 
1840. Productus, de Yernedil. Bull. Soc. G£ol. de France, vol. vi, p. 259, pi. iii, fig. 3. 
1841. Clavagella, Goldfuss. Petrefacta Germanise, vol. ii, p. 285, pi. clx, fig. 17. 
1841. Productus, von Buch. Abhandl. der Konigl. Akad. der Wissensch. zu Berlin, Theil i, p. 40. 
1843. Productus, de Koninck. Descript. Animaux Fossiles du Terr. Carb. de Belgique, p. 11, fig. 4. 
1847. Productus, de Koninck. Monographic du genre Productus, p. 62, pi. vi, fig. 4. 
1854. Productus, Norwood and Pratten. Joui-n. Acad. Nat. Sci. Philadelphia, 2d Ser., vol. iii, p. 10. 
1861. Productus, Davidson. British Carb. Brachiopoda, p. 163, pi. xxxiii, figs. 1-4. 
1880. Productus, Davidson. British Carb. Brachiopoda, Suppl., p. 311, pi. xxxvi, fig. 13. 
1887. Proboscidella, (Ehlert. In Fischer’s Manuel de Conchyliologie; Brachiopodes, p. 1277. 
Diagnosis. “Valves very unequal; the dorsal small, concave, operculiform ; 
the ventral larger, convex, furnished with two lateral expansions which bend 
downward to meet the margins of the dorsal valve, and an anterior expansion 
which is produced forward into a long cylindrical tube, sometimes attaining 
twice the length of the shell; the suture appears on the dorsal side in the 
median line. Sometimes instead of a single tube there is a double enrollment 
resulting in two distinct tubes. The surface is ornamented by concentric plica¬ 
tions, traversed by fine radiating ribs, which are flexuous and close together ; 
the last plication, and the groove accompanying it, is sharper than the others 
and marks the separation of the ventral valve, properly speaking, from its 
lateral and anterior expansions upon which the concentric markings are rare, 
faintly developed or wholly wanting, while the radiating striae are regularly 
continued.” ((Ehlert, loc. cit.) 
Carboniferous limestone. 
Type. Productus proboscideus, de Verneuil. 
Figs. 31-33. Productus (Proboscidella) proboscideus, de Verneuil. 
After de Koninck. 
