y 52 Hj'drodamalis. 



Familia IV. Hydrodamalidae. 



1481. Hydrodamalis, Eetzius, 1794; Palmer, 1895. 



Rhytina, Illiger, 1811; Trt., 1898. 

 Eetzius, Vetensk. Acad. Nya Haudl. Stockh., XV, 1794, p. 292. 



7941.stelleri, Retzius, 1. c, 1794 — {pdU syn,). Mare Behring 



(extinctus). 



gigas, Zimmermaun — {5944); Elliot, » 



Field Columb. xMus., II, 1901, p. 5, pi. 2. 



^ gigas foss^, Woodward — (5944). f Pleistoc. I. Behring. 



