PSEUDAMUSSITJM. 323 



radiating, small, straight, rounded ridges flattened on top, crossed 

 by distant concentric growth-lines ; posterior auricle slightly larger 

 than the anterior. Left valve nearly flat, with radiating ridges 

 similar to the right valve, but not flattened on top, whilst they are 

 crossed by closely-set concentric lamellae ; auriculae nearly equal 

 in size. 



Dimensions. — Height G9 mm. ; length 76 mm. 



Form, and Loc. — Eocene : Victoria. 



L. 351. Example of the adult ; from Bairnsdale. 



Presented by W. S. Grigson, Esq. 



L. 4811. Eoth valves; neanic stage of growth; from Muddy 

 Creek. Presented hy John Dennant, Fsq. 



L. 6580. Examples of both valves ; from Muddy Creek. 



Purchased. 



L. 9915. Large fragments of the adult; from Muddy Creek. 



Purchased. 



Pseudamussium. liochstetteri (?), Zittel (sp.). 



1865. Feeten hochstetleri, Zittel, Reise der Novara, Palaontologie, Bd. i. 



Abth. ii. p. 50, taf. xi. figs. 5a-b, 

 1873. Pecfen liochstetteri, Hutton, Cat. Tert. Moll. N.Z. p. 30. 



Shell suborbicular, thin, compressed ; both valves smooth ; 

 auriculffi nearly equal in size, obtuse. 



The specimens in the Museum collection are very small, and are 

 referred to this species doubtfully. They somewhat resemble 

 fig. 5a in Zittel' s work above quoted. 



dimensions. — Height 26 mm. ; length 24 mm. 



Form, and Loc. — Miocene : New Zealand. 



L. 10499. Cast of the interior of a valve ; from Port Hills, 

 Nelson. Sir James Hector Coll. 



L. 10505. Interior of valve, attached to a block of argillaceous, 

 micaceous sandstone ; fi'om Mokihiuui. Sir James Hector Coll. 



