4 70 Transactions. — Geology. 



Magellania parki, sp. nov. Plate XLV., fig. 4. 



Oval or suborbicular, smooch ; valves nearly equal, rather 

 depressed; beak short, sharply keeled laterally; the inner 

 margins of the deltidial plates forming a groove. Ventral 

 valve flattened at the sides. Commissure with a strongly 

 marked downward (ventral) sinuation. 



Length, 25 - 37 mm. ; width, 26-29 mm.; thickness, 

 13-17 mm. 



Localities. — Oamaru (type) ; Waipara. 



The septum is thick and less than half the valve. Several 

 specimens connect this with the last species, but the type is 

 very different. 



Magellania insolita. Plate XLV., fig. 5. 



M. insolita, Tate, Trans. Phil. Soc. of Adelaide, 1880, p. 12, 

 pi. ix., fig. 6. 



Medium, oval, the greatest breadth before the middle. 

 Smooth except a few growth-lines, moderately convex, com- 

 missure nearly straight. Beak slightly incurved, obscurely 

 keeled laterally; foramen complete, round, medium. Delti- 

 dium rather small, the two plates not united. 



Length, 21 - 28 mm. ; width, 17 - 24 mm. ; thickness, 

 10-16 mm. 



Localities. — Duntroon ; Curiosity Shop. 



Separated from M. novara by its shape, and from M. lenti- 

 cidaris by being depressed. It is also smaller than either. 

 Doubtfully identified, as Professor Tate's description is in- 

 sufficient, and I have no Australian specimens. 



Magellania suffiata. Plate XLVL, fig. 1. 



Wold, suffiata, Tate, Trans. Phil. Soc. of Adelaide, 1880, 

 p. 18, pi. vii., fig. 3, and pi. viii., fig 4. 



" Shell subovate, greatest width about the middle; lateral 

 margins convex in the middle, becoming straight or slightly 

 bisinuated (rarely biplicate) towards the narrow rounded 

 front. Test thick, surface smooth, with numerous moderately 

 strong lines of growth. Shell-structure minutely and closch 

 punctate as viewed under a lens. Peduncular valve very con- 

 vex in a longitudinal direction, and regularly convex trans- 

 versely. Beak strongly incurved, slender ; foramen minute. 

 Deltidium of one piece, broadly triangular and deeply concave. 

 Brachial valve very convex, faintly impressed or flattened 

 medially, becoming gradually depressed in the middle towards 

 the somewhat narrowed front. Septum a little less than half 

 the length of the valve. Loop unknown. (Tate.) 



