ANATINID&. £37 
N. trailli, Hutton, CAM, p. 62. Ovate, produced behind ; 
white, with distant concentric lamin, which become obsolete on the 
beak ; beak rugose. 
Height, ‘2; length, -4. 
Stewart Island, 14 fathoms. 
Genus, MYODORA, Gray. 
Trigonal, rounded in front, attenuated and truncated behind ; right 
valve convex, left flat; interior pearly ; cartilage narrow, triangular, 
between two tooth-like ridges in the left valve, with a free sickle-shaped 
ossicle ; pallial line sinuated. 
M. striata, Quoy, fc. ii., 2. 537, pl. 83, f. 10; Reeve, Conch. Ic., 
J. 6; Chenu, f. 215.  Ovato-trigonal, solid, longitudinally striated, 
anterior end rounded, posterior sub-angulated and folded ; sub-equila- 
teral ; apex acute; white ; interior pearly. 
Height, 1173's length, 1°55. 
Common in the North, rare in the South. Dunedin. 
The Natives call this shell “ pakira.” 
Me plana, Reeve, P:ZS., we445 Conch. Te, f. 3; MM. brevis, 
C.M.M. Shell triangularly oblong, slightly truncated anteriorly, very 
flat, concentrically striated ; striz raised, rather distant, those of the left 
valve the more prominent (Reeve.) 
Height, °35 ; length, 4. 
Stewart Island. Philippines. 
Mi Ovata, Aecve P.Z.S., 1844.5 Conch. Te, f-4; Chenu; fo 210. 
Shell ovate, somewhat triangular ; left valve ventricosely concave ; right 
valve slightly convex, concentrically striated ; strive raised, somewhat 
obsolete near the anterior margin, those of the right valve numerous 
and close, of the left valve prominent, and rather distant ; umbones 
depressedly incurved (Reeve.) 
Height, °6; length, -45. 
Stewart Island. Australia. Tasmania. Philippines. 
M. rotunda, Sowerby, P.Z.S., 1875, p. 129, pl. xxiv., f 8. Shell 
roundly sub-trigonal, very inequivalve, white, both valves concentrically 
strongly striated, with two slight angles on the posterior side; dorsal 
margin excavated, scarcely incurved ; umbones acute, of a bluish tint ; 
right valve very ventricose, with two ribs from the umbones to the 
posterior margin ; left valves flat ; triagonal ligamentary pit rather small 
(Sowerby. ) 
Height, ‘9 ; breadth, r’o inch. 
The right valve is much deeper ; umbones more central; dorsal 
margin less incurved and more sloping; ligamentary pit much smaller, 
and the whole shell rounder than in JZ. striata. 
Genus, CHAMOSTRZZA—Roissy. 
Shell inequivalve, solid, attached by the nght valve; left valve 
flat. 
Australia and New Zealand only. 
