BRACHIOPODA. 
267 
Genus STREPTORHYNCHUS, King. J850. 
PLATE XI, EIGS. 6-17; PLATE XIb, PIGS. 9-15; AND PLATE XX. 
1816. Terebratulites, Schlothbim. Denkschr. d. K. Akad. d. Wissenschaft, in Miinchen, vol. vi, p. 28, 
pi. viii, figs. 21-24. 
1837. Orthis, von Buch. Ueber Delthyris oder Spirifer und Orthis, p. 62. 
1848. Orthis, Geinitz. Verstein. d. Deutsch. Zechsteingebirges, p. 13, pi. v, figs. 11-15. 
1850. Streptorhynchus, King. Monogr. Perm. Fossils England, p. 109, pi. x, figs. 18-28. 
1853. Orthisina, Davidson. Introd. British Foss. Brachiopoda, p. 104, pi. viii, fig. 156. 
1857. Streptorhynchus, Davidson. British Permian Brachiopoda, p. 32, pi. ii, figs. 32-42. 
1861. Orthis, Geinitz. Dyas, vol. i, p. 92, pi. xvi, figs. 26-34. 
1862. Streptorhynchus, Davidson. Quart. Journ. Geol. Society, vol. xviii, p. 3, pi. i, figs. 17, 18. 
1863. Streptorhynchus, de Koninck. Fossiles Paleoz. de l’lnde, p. 37, pi. x. fig. 17. 
1871. Orthis, Qdenstedt. Petrefaktenkunde Deutschlands; Brachiopoden, p. 548, pi. lv, figs. 51-56. 
1874. Streptorhynchus, Derby. Carbonif. Brach. Itaituba, p. 35, pis. v, viii. 
1880. Streptorhynchus, Davidson. British Permian Brachiopoda, Suppl., p. 243, pi. xxx, fig. 3. 
1884. Streptorhynchm, Waagen. Salt-Range Fossils, vol. i, pp. 576-591, pi. 1, figs. 3-9; pi. lv, figs. 4-13. 
1887. Streptorhynchus (Orthothetes), CEelert. Fischer’s Manuel de Conchyl., Brach., p. 1284, fig. 1050 
Diagnosis. Shells somewhat trihedral and subpyramidal, with base convex; 
hinge-line shorter than the greatest width of the valves. Pedicle-valve having 
the beak acute and often incurved and distorted. Cardinal area high, some¬ 
what incurved ; delthyrium covered by a broad, imperforate, depressed-convex 
deltidium. The interior of the valve with low dental ridges terminating in 
teeth of moderate size; these ridges are not septiform and do not continue to 
the bottom of the umbonal cavity; there is no median septum; muscular scars 
strong and flabelliform. 
In the brachial valve the cardinal area is linear, the crural plates are vertical 
and abruptly elevated on their anterior edges, forming points of attachment 
for the crura; these unite to form a subcrescentic plate, from the center of 
which arises a broad, erect cardinal process, which is deeply divided into two 
lobes, each of which is faintly grooved at its summit and on the posterior face; 
muscular area small, divided medially by a low ridge. Exterior surface 
covered by fine radiating striae. 
Type, Terebratulites pelargonatus, Schlotheim. Permian. 
Observations. According to Dr. Waagen’s determination it will probably 
be necessary to restrict this genus to species agreeing with the above mentioned 
characters of S. pelargonatus. Though the relationship of this group with the 
