. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER PENTAMEROIDEA 173 generically from that of Clorinda. In B. minor Booker the septal plates are more widely divergent than in B. wilkinsont, in which they are subparallel. The latter species is approaching Barrandella, but the former is quite a typical Clorinda. We therefore regard Barranditia as a synonym of Clorinda. Genus BARRANDELLA Hall and Clarke 1893 PI. 26, figs. 1-3, 5-7; t. fig. 30 Hall and Clarke. Pal. N. Y., vol. 8, pt. 2, pp. 241, 245, p
. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER PENTAMEROIDEA 173 generically from that of Clorinda. In B. minor Booker the septal plates are more widely divergent than in B. wilkinsont, in which they are subparallel. The latter species is approaching Barrandella, but the former is quite a typical Clorinda. We therefore regard Barranditia as a synonym of Clorinda. Genus BARRANDELLA Hall and Clarke 1893 PI. 26, figs. 1-3, 5-7; t. fig. 30 Hall and Clarke. Pal. N. Y., vol. 8, pt. 2, pp. 241, 245, pi. 71, figs. 1-3, t. fig. 173; , pt. 2, 1895, p. 844, figs. 457-458. Genoholotype. — Atrypa linguifera Sowerby 1839, in Murchison, Sil. Syst., p. 629, pi. 13, fig. 8. Distinguishing characters.—Barrandella is to the genotype. Later Schuchert (1897) regarded it as a synonym of the older Clorinda. Recently the name has been revived by Booker (1926) and Koz- lowski (1929), the latter recognizing Barrandella as a genus and Clorinda as a subgenus, but we prefer to regard both groups as of generic rank. Geologic range.—Silurian of North America and Europe. American Species Clorinda ventricosa (Hall) 1860 ? (Hall) 1852 European Species Barrandella linguifera (Sowerby) 1839 ^ .. Oh <i^"n^-r^"^"^. Tf/n \J Fig. 30.—Serial sections of Barrandella linguifera (Sow.), from the Gotlandian of Dudley, England. After Kozlowski. cr, crural plates (inner plates); ca, carina at limit of crural plates and crural septa; sfr, crural septa (outer plates); sm, spondylium. be used for shells having an exterior and a ventral interior like those of Clorinda. Inside the dorsal valve, however, the supporting septa of the crural plates are convergent and unite to form a sessile or nearly sessile cruralium. On the outside of the dorsal valve, when the shell is worn, a single septum is visible, which is the track of the united plates. A peculiar internal character
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