Hurron— Zhe Plocene Mollusca of New Zealand. 89 
Prcren neozenanica, Gray, in Dieft. N.Z. II. p. 260; Voy. Erebus and Terror, Moll. 
pl. um. fig. 7; P. dieffenbachiz, Reeve, Conch. Icon. fig. 88. 
Locality.—Wanganui, Petane, Matapiro. 
Pecren rapiatus, Hutton, Cat. Marine Moll. of N.Z. p. 82. 
Shell orbicular, equivalve, compressed, with about 80 equal, rough radiating 
) EN ? i 5 5 
striz ; thin, margin crenulated ; ears unequal. Length 43mm. ; height 45mm. 
Locality.—Wanganui, Petane. 
PercTEN semrpLicatus, Hutton, Cat. Tertiary Moll. of N.Z. p. 30. 
Shell sub-orbicular, compressed ; with 5 or 6 plications near the umbo, 
@ ribs ; the 
t 
whole finely, but rather strongly concentrically striated. Height about 65-70mm. 
which disappear before reaching the margin; and numerous radiatin 
Locality.—Napier. 
PECTEN CONVEXUs, Quoy and Gaimard, Voy. Astrolabe, Zool. IIT. p. 443, pl. uxxvr. 
figs. 1-3; P. voseo-punctatus, Reeve, Conch. Icon. fig. 84. 
Locality.—Wanganui, Petane, Matapiro. 
Genus ANOMIA. 
Key to the species. 
Shell thick ; only two muscular impressions of ... A. stowel. 
Shell thin, smooth ... ee Ss ne ir ... A. alectus. 
Shell thin, undulated st aie at ae ... A. undata. 
Ayomia stoweE!, Hutton, Cat. Marine Moll. of N.Z. p. 83. 
Shell sub-orbicular, solid, the lower valve smooth, notch large, ovate, the 
anterior lobe widely separated from the cardinal edge. Muscular impressions two 
only, the upper one large, broadly ovate or sub-orbicular, the lower one sub- 
orbicular, much smaller and placed on the posterior lower edge of the upper, and 
confluent with it. Diameter 90mm. 
Locality.—Petane, Matapiro. Fragments only. 
M 
