327 



structure of the inside of the shell alone, as revealed by the 

 surfaces of the layers, the outermost layers having been I'emoved 

 by decomposition, or shivered into minute fragments too imperfect 

 for examination. 



Type. — Finna rudis, Linnaeus. 



Pinna distans (?), Hutton. 



1873. Pinna distans, Hutton, Cat. Tert. Moll. N.Z. p. 26. 



" Large, with distant plications, the ridges being much narrower 

 than the furrows. Height 9 (inches) ; length 4'5 (inches) ; angle 

 of apex 40°."— iZ««o». 



L. 10483, L. 10488. Casts of several specimens which may 

 possibly be identified with this species ; though the meagre 

 description given by its author practically defies identification. 

 Miocene : Akuakua, east coast of Auckland, New Zealand. 



Sir James Hector Coll. 



Pinna, sp. 



97721. Fragment of a species having semilunate undulating 

 ridges ; from (locality ?) Western Australia. H. Y. L. Brown Coll. 



L. 9583. Shell conglomerate, in which are several fragments 

 of a large species of Pinna, too imperfect for specific identification ; 

 from the Post-Pliocene (?) of Flint Cliff, Shark's Buy, Western 

 Australia. Presented hy W. Saville-Kent, Esq., F.L.S. 



Family MTTILIDiE. 



Genus MYTILUS, Linnaeus. 



[Syst. Nat. ed. 10, 1758, p. 704.] 



Shell equivalve, cuneiform, very inequilateral ; umbones acute ; 

 posterior margin rounded ; cardinal teeth small, or obsolete ; 

 ligament linear, marginal ; interior of the valves commonly lined 

 with nacreous matter ; anterior adductor of the valves small, 

 posterior very large. 



2'y]}e. — MyliluB edulis, Linnceus. 



