BY C. HEDLEY. 487 



Emarginula convexa, n.sp. 

 (Plate xvi., figs. 13, 14.) 



Shell small, solid, with a slight spiral twist, high arched, with 

 a narrow inrolled depressed apex which projects beyond the base. 

 Posterior wall concave. Aperture regularly oval, its edge frilled. 

 Sinus a long cleft; fasciole continued to the apex as a broad 

 furrow enclosed between narrow elevated walls and latticed by 

 spaced bars. Colour pale green and gray in indistinct concentric 

 zones. Sculpture : about 50 close-set radial ridges, alternately 

 larger and smaller, bear crowded beads largest at their termina- 

 tion and diminishing upwards. Across the narrow interstices 

 concentric threads join bead to bead. When worn the concentric 

 sculpture becomes more prominent. Height 1-75 mm.; length 

 31mm.; breadth 1*95 mm. 



Numerous examples from 17-20 fathoms. 



Macroschisma madreporaria, n.sp. 

 (Plate xvi., figs. 4, 5, 6, 7.) 



Shell small, rather thin, about twice as long as broad, ovate- 

 oblong, moderately elevated, broadest opposite centre of perfora- 

 tion, then gradually tapering anteriorly, posteriorly rounded, 

 anteriorly truncate, dorsal slope neatly half the length of the 

 shell, gradual, with an obscure median furrow; side slopes 

 straight, posterior slope most brief, being shorter than the 

 eroded edge of the perforation. Colour variable, in the type, 

 rose rays on a cream ground. Peristome sharply turned up 

 behind, almost level in front. Perforation about the breadth of 

 the shell, a narrow wedge-slit, sides straight anteriorly sharply 

 meeting, posteriorly excavating a broad crescent in the shell. 

 Sculpture : fine dense radiating threads which tend to produce 

 beads at the intersection of equal growth-lines. Length 9-5nnn.; 

 breadth 4*5 mm.; height 2*5 mm. 



Several specimens from 17-20 fathoms. 



The only record of Macroschisma from tropical Australia is a 

 note by Brazier (These Proceedings, ii. 1877, p. 51) that M. com- 



