76 Macieay Memoria VoLuMe. 
Myopora antipopum, Smith, le. p. 585, pl. ti. fig. 7. 
Locality.—W anganui. 
oO 
Myopora sottont, Smith, Le. p. 585, pl. ui. fig. 9. 
Locality.—Matapiro. 
Genus MACTRA. 
Key to the species. 
Shell ovate, the pallial smus shallow. 
Posterior end rounded _... m3 oes se AM eSCOrS. 
Posterior end attenuated ... ase Bee .. WW. scalpellum. 
Shell oval, the pallial sinus deep Soe oe .. MM. lavata. 
Shell trigonal, solid. 
Pallial sinus deep ... he aye He .. MW. equilatera. 
Pallial sinus shallow ee ie 2 sa MW. crassa: 
Macrra piscors, Gray, Voy. Erebus and Terror, Moll. pl. 1. fig. 4; Reeve, Conch. 
Tcon. fig. 17. 
Locality.—W anganui, Matapiro, Patea. 
Macrra scaueettum, Deshayes, Pro. Zool. Soc. 1854; Reeve, Conch. Icon. fig. 106. 
Locality.—Wanganui, Petane. 
Macrra tavata, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 331. 
(Plate vim. fig. 81.) 
Shell oval, thin, inequilateral, smooth, rather compressed. Dorsal slopes 
nearly straight, the posterior much longer. Ventral margin rounded. Posterior 
end tapering, but not truncated nor angled. The whole shell with very fine 
concentric lines which are seen under a lens to be crossed by excessively minute 
radiating lines, giving a delicate granulated appearance. Right valve with two 
strong anterior, and two equally strong posterior lateral teeth ; short and high, 
the inner on each side being higher than the outer. Left valve with one lateral 
on each side, longer than those of the right valve. Length 23mm.; height 
19mm.; thickness 11 mi. 
Locality.— Petane. 
