. Catalogue of the Mollusca in the collection of the British Museum. Mollusks -- Catalogs and collections. 14 BRACHIOPODA. Others, each with a double termination, are inserted in the hinge- plate {p) of the dorsal valve; the septum supports the visceral membranes. The position at which the intestine of Terebratula terminates, namely just behind the adductor muscle (fig. 2, v), seems to imply that it discharges through the byssal/oramera ; and as the same arrangement exists in Terebratulina, Kraussia, Argiope, and in the recent Rhynchonella nigricans, it becomes probable that such is the genera
. Catalogue of the Mollusca in the collection of the British Museum. Mollusks -- Catalogs and collections. 14 BRACHIOPODA. Others, each with a double termination, are inserted in the hinge- plate {p) of the dorsal valve; the septum supports the visceral membranes. The position at which the intestine of Terebratula terminates, namely just behind the adductor muscle (fig. 2, v), seems to imply that it discharges through the byssal/oramera ; and as the same arrangement exists in Terebratulina, Kraussia, Argiope, and in the recent Rhynchonella nigricans, it becomes probable that such is the general rule; in those extinct genera which have the foramen closed at an early age, there is always an opening be- tween the deltidium and the umbo of the smaller valve (e. g. in Uncites gryphus), which has been mistaken for a byssal notch. The foramen in the hinge-plate of Athyris shows that the intes- tine took the same course in the Spiriferidce as it is known to do in the Rhynchonellidce and TerebratulidcB *. The following illustration (fig. 2*) is from a drawing by Mr. Albany Hancock. Fig. 2*. Waldheimia flavescens. "" .-A V X. Fig. 2*. a. adductors; r. retractors ; x. accessory retractors (anal muscles); pedicle-muscles ; z. function uncertain ; o. mouth ; v. vent; I, loop ; t. den- tal fioplfpf. tal socket * The muscular system of Ter. flavescens was correctly (though diagramatically) represented and described by Mr. King in his Memoir of the Permian Fossils, published by the Palaeontographical Society in 1850; t)it function of the retractor muscles was not stated, but must have been understood. (Woodward, MS.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Zoology; Gray, John Edward, 1800-1875. London Printed by order of the Trustees
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