488 MOLLUSCA OP MAST HEAD REEF, QUEENSLAND, II., 



pressa Adams, was taken in 30 fathoms off Darnley Island. 

 Probably the present species was there referred to. As no 

 information has appeared on the growth-stages of the genus, I 

 present a figure of a shell (fig.7) 1-85 mm. long in the Puncturella 

 stage, and of another (fig.6), 2*95 mm. long, in the Glyphis stage, 

 showing the evolution of the slit. 



Gena ungula, n.sp. 

 (Plate xvi., figs. 1, 2.) 



Shell oblong-ovate, small, thin, attenuated, about twice as long 

 as broad, arched. Spire minute, flat, at right angles to the 

 shell's length, terminal, of two whorls. Colour white with 

 irregular crimson splashes spirally arranged along the back. 

 Sculpture : fine spiral grooves decussated by growth-lines. 

 Peristome nearly in one plane, angled above. Columella slightly 

 thickened. Length 3*4 mm.; breadth 1-65 mm. 



A few specimens from 17-20 fathoms. 



The small size, narrowness and conspicuous painting seem to 

 separate this from others of the genus. 



Clanculus granti, n.sp. 



(Plate xix., figs. 45, 46.) 



Shell solid, umbilicate, conical, pointed at the apex, slightly 

 angled on the shoulder, rounded at the periphery and flattened 

 on the base. Whorls seven. Colour, on the last three whorls, 

 oblique and zigzag brick-red stripes extending from suture to 

 peripher}^; between these as well as on apex and base, pale 

 cream. Sculpture: the third, fourth and fifth whorls carry 

 distinct spiral grooves latticed by oblique threads, which do not 

 cross the intervening ridges. On the latter whorls this sculpture 

 gradually fades away, leaving the last whorl smooth and polished. 

 Around the axis on the base run four profound spiral grooves, 

 tlie outer deepest, separated by smooth, prominent, narrow cords. 

 Umbilicus narrow, bounded by a tuberculate rib, within which it 

 is excavate, and spirally ascends the full height of the shell's 



