90 Macteay Memortat Vouvme. 
Anomia atectus, Gray, Pro. Zool. Soe. 1849, p. 117. 
Shell thin. Muscular impressions three; the upper larger and_ sub- 
orbicular ; the two lower scars close together but not confluent, about equal in 
size. Diameter about 45mm. 
Locality.— Wanganui, Petane. 
Ayomta unpata, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 324. 
(Plate 1x. fig. 95.) 
Shell broadly oval, transverse. Upper or left valve thin, rather inflated, 
the surface gently, rather regularly waved; the undulations taking different 
directions on different shells, but more or less parallel on the same individual. 
Muscular impressions three, confluent, forming a long oval mark sloping from 
before the umbo to the centre of the shell; the upper one the largest, the other 
two sub-equal. Length 21mm. ; breadth 17mm. 
Locahity.—Petane. 
Genus OSTREA. 
OsrreEA EDULIS, Linné; Reeve, Conch. Icon. fig. 8. 
Locality.—Wanganui, Petane, Matapiro. 
OsrreaA corrucaTa, Hutton, Cat. Tertiary Moll. of N.Z. p. 35; Hector, Outlines of 
Geol. of N.Z. p. 51, fig. 2. 
Shell ovate, irregular, attached by the left valve. Left valve convex, 
radiately ribbed, the ribs crossed by concentric, undulating, imbricating lamine. 
Right valve flat, irregular, smooth, with concentric imbricating laminar plates 
round the margin. Length 65mm. ; height 75mm. 
Locahty.— Wanganui. Rare. 
