254 
PALAEONTOLOGY OF NEW YORK 
1874. Streptorhynchus, Hartt. Bull. Buffalo Soc. Nat. Sci., vol. i, p. 248, pi. ix. 
1874. Streptorhynchus, Derby. Carbonif. Brachiopoda of Itaituba, p. 37, pis. v, viii. 
1874. Streptorhynchus, Nicholson. Palaeontology Province of Ontario, p. 70. 
1875. Hemipronites, Meek. Palaeontology of Ohio, vol. ii, p. 279, pi. x, fig. 5. 
1877. Hemipronites, Meek. Geol. Expl. Fortieth Parallel, vol iv, p. 35, pi. iii, fig. 2; p. 62, pi. vii, fig. 2. 
1877. Streptorhynchus, Hall and Whitfield. Geol. Exploration Fortieth Parallel, vol. iv, p. 252, 
pi. iv, figs. 1-3. 
(?) 1878. Streptorhynchus, Dawson. Acadian Geology, Third Edition, p. 296, fig. 96. 
1879. Streptorhynchus, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist., pp. 150, 151, pi. xxi, 
figs. 26-33; pi. xxiii, figs. 11-13. 
1882. Streptorhynchus, Whitfield. Annals N. Y. Academy of Sciences, vol. ii, pp. 193, 200. 
1S82. Streptorhynchus, Hall. Eleventh Rept. Indiana State Geologist, pp. 287, 288, pi. xxi, figs. 26- 
33 ; pi. xxiii, figs. 11-13. 
1883. Streptorhynchus, Hall. Second Ann. Rept. N. Y. State Geologist, pi. xxxix, figs. 21-32; pi. xl 
figs. 1-9; pi. xlii, figs. 16-27. 
1884. Streptorhynchus, Walcott. Palaeontology Eureka District, p. 117, pi. xiii, figs. 7, 16. 
1884. Orthothetes, Waagen. Salt-Range Fossils, I, vol. iv (fas. 3), p. 607, pi. Iv, figs. 1, 2. 
1884. Orthothetes, Davidson. General Summary British Fossil Brachiopoda, p. 379. 
1887. Streptorhynchus, CEhlert. Etudes sur quelques Foss. Devon de l’Ouest de la France. 
1887. Strophomena, Foerste. Bull. Denison University, vol. ii, p. 105, pi. viii, figs. 31, 32, 34-38. 
1888. Hemipronites, Herrick. Bull. Denison University, vol. iii, p. 37, pi. iii, fig. 24; pi. v, fig. 14 ; 
pi. vi, fig. 8; pi. ix, fig.’21; vol. iv, pi. ii, figs. 1,5; pi. iii, fig. 12. 
1889. Streptoi'hynchus, Beecher and Clarke. Memoirs N. Y. State Museum, vol. i No. 1. 
1S89. Streptorhynchus, Nettelroth. Kentucky Fossil Shells, pp. 140-142, pi. xxix, figs. 11, 12 ; 
pi. xxxi, figs. 31-33. 
Diagnosis. Shells plano-convex or biconvex, sometimes becoming concavo- 
convex with age. Brachial valve usually the deeper in the pallial region; 
pedicle-valve highest about the umbo, which is sometimes much extended, and 
often shows a pronounced tendency to irregular growth. Surface covered with 
slender, subequal radii, which are crenulated by sharp concentric striae. Hinge¬ 
line long, equaling, and often greater than the width of the shell; in some 
species frequently showing a tendency to auriculation at the extremities. 
Pedicle-valve with the cardinal area prominently developed; the delthyrium 
covered by a thick, more or less convex deltidium, which is rarely if ever per¬ 
forated at maturity. On the interior the teeth are moderately large, sometimes 
thickened, but not supported by dental plates. 1 * 4 The muscular area is marked 
by flabelliform cardinal scars, inclosing a small adductor impression; similar to 
that in Rhipidomella, but often very faint. 
In the brachial valve the cardinal area is narrow, the deltidial covering 
small and emarginate at the center. The cardinal process is united to the 
crural plates, the whole forming a vertical subcrescentic process, most elevated 
