. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. 56 GENERA OF THE SUBORDERS ORTHOIDEA AND PENTAMEROIDEA The structure of the dorsal interior of Finkeln- hurgia is quite unique among the early brachiopods in the possession of supporting plates attached to the brach- iophores and fulcral plates, forming the sockets as in Plectorthh. The cardinal process when present is a simple, linear ridge. It is impossible to say from the material studied whether it bore a crenulated myophore or not. The callosities beneath the adductor sca
. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. 56 GENERA OF THE SUBORDERS ORTHOIDEA AND PENTAMEROIDEA The structure of the dorsal interior of Finkeln- hurgia is quite unique among the early brachiopods in the possession of supporting plates attached to the brach- iophores and fulcral plates, forming the sockets as in Plectorthh. The cardinal process when present is a simple, linear ridge. It is impossible to say from the material studied whether it bore a crenulated myophore or not. The callosities beneath the adductor scars are another reminder of syntrophiid structure. Walcott's figures of this genus (pi. 93, figs. 1, 2) are unsatisfactory and verbal corrections are necessary. Figures id and if, of F. osceola, are typical ventral Family Schuchert and Cooper 1930 The Plectorthidae are biconvex or convexo-concave Orthacea derived out of the Finkelnburgiidae, having a rather variable ventral musculature, but in the dorsal valve a uniform structure of the cardinalia. The brachiophores are supported by convergent plates unit- ing with the floor of the valve near the cardinal process. Sockets are defined by small concave fulcral plates. Cardinal process simple, with a compressed crenulated myophore (in the ancestral genus Finkeln- Platystrophiinae Table 3 -Orthostrophiina. Cyclocceliinx â \ / Plectorthidae Skenidiidae Finkelnburgiidae T 2 Orusia and dorsal valves having the characteristic features of this genus when the two valves are in association. Figure le is probably not a Finkelnburgia since it has a rather strong sulcus, not seen in all the other speci- mens referred to this genus. Figures Ig and Ih appear to belong to Eoorthis. Figures 2 and 2e of the genotype, F. finkelnburgi, are taken by us as characteristic of the genus. Fig- ure 2 shows strong pallial markings and a prominent median ridge such as occurs in F. osceola. Figure 2e of the dorsal interior shows traces of the m
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