Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 80. (Budapest 1988)

Pálfy, J.: Middle Triassic rhynchonellids from the Balaton Highland (Transdanubian Central Range, Hungary)

cavities are rather narrow, trigonal in cross-section. No pedicle collar has been observed. The hinge teeth are short, anteriorly and dorsally expanded. Short, blunt denticula were also ascertained. Brachial valve : Dorsally arched hinge plates with pronounced crural bases are characteristic. The septalium is shallow and widely V-shaped, supported by a long dorsal median septum, which persists well beyond the plane of articulation. The wide and shallow sockets are situated between the blunt and nearly equal inner and outer socket ridges. No additional sockets are developed. The crura are of radulifer type, originating from the distal ends of the hinge plates. The cross-section of the crura is trigonal, then rather elongated, blade-like toward the front of the shell. Fig. 5. Volirhynchia tommasi (BITTNER, 1890): a series of 11 transverse sections through the posterior part of a specimen from Aszófő. Original length 11.5 mm. The crura persisted to 3.0 mm from the posterior end of the shell.