476 MOLLUSCA OF MAST HEAD REEF, QUEENSLAND, I., 



a stronger posterior cardinal, right with one anterior and two 

 posterior cardinals. In the left valve the posterior inner margin 

 is furrowed, and the anterior ridged to clasp corresponding eleva- 

 tions and depressions in the other valve. Muscular impressions 

 distinct. Height 1'4 mm.; length 1 -22 mm.; diameter of con- 

 joined valves 084 mm. 



Several living specimens from 17-20 fathoms. [Since this was 

 written Miss L. Parkes has obtained several separate valves of 

 this species in Middle Harbour, Sydney]. 



Codakia oblonga Hedley. 

 Lucina oblonga Hedley, Mem. Austr. Mus. iii. 1899, p. 497, fig. 51. 

 This species was described from Funafuti. A few separate 

 valves were taken in 17-20 fathoms off Mast Head. 



Cardium skeeti, n.sp. 



(Plate xxxviii., fig. 25.) 

 Shell small, obliquely cordate, inflated, inequilateral, rather 

 thin. Colour: different individuals are various shades of lemon, 

 lilac, pink or purple ; in pale specimens with dark concentric 

 streaks on the posterior side. Sculpture: about thirty-eight 

 radials densely crowded with sharp imbricating hooded scales 

 which give a harsh aspect to the shell and extend over the whole 

 surface. These are parted by deep and narrow grooves, latticed 

 by minute densely disposed crossbars, and produced at the margin 

 as interlocking teeth, posteriorly long, acute, anteriorly short 

 and blunt. Length 8 mm.; height 6 mm.; depth of single valve 

 3 mm. 



This is an abundant species in 17-20 fathoms. It is named 

 after Mr. H. C. Skeet, a member of the Expedition. 



Gafrarium navigatum, n.sp. 



(Plate xxxviii., fig.33.) 



Shell small, equilateral, broad cordate, very solid, rather com- 

 pressed. Umbo sharply pointed. Lunule long and narrow. 

 Colour white, rose, or orange, with a few scattered brown dots. 



