Potamonautidae Bott, 1970

Potamonautes lirrangensis (Rathbun, 1904) (Fig. 21)

Ossicles I and II are inclined about 45° in the antero ventral direction. Ossicles “IV–V” are observed as mixed ossicle. The zygocardiac ossicle (V) has a small semicircular impression antero ventral. The pectinal ossicle (VIII) is horseshoe-shaped with five accessory teeth. The inferior lateral cardiac ossicle (XIII) has a connection pice to the subdentate ossicle (XIV) antero dorsal. The subdentate ossicle (XIV) has postero ventral a remarkable spine, which is posteriorly directed. The ossicle (XXIa) is not recognisable.