490 MOLLUSCA OF MAST HEAD REEF, QUEENSLAND, 11., 



closel)^ resembles the Cingalese G. blanfordiana G. & H. Nevill, 

 from which the umbilical funicle distinguishes the Queensland 

 .shell. 



MONILEA TROPICALIS, n.sp. 



(Plate xvi., fig. 12.) 



Shell small, rather thin, depressedl}' conical, widely umbilicate. 

 Colour grey, turning to pink on the last whorl, a few scattered 

 crimson dots on the larger ribs. Whorls 4|, the spire biangulate, 

 last whorl angled at shoulder, periphery and base. Sculpture : 

 a well-developed spiral rib girdles the periphery, parted from this 

 by broad interspaces runs a similar one above and another below. 

 On the base are four smaller spirals followed b}' a larger granulate 

 rib which borders the umbilicus. Within the broad and deep 

 umbilicus continues a succession of granose spirals. The flat sub- 

 sutural shelf is traversed by radial plications and the whole shell is 

 overrun by dense, fine, radial threads. Aperture subcircular, 

 simple. HeightS'lSmm.; majordiameter3-75mm.; minordiameter 

 3 mm. 



A single specimen from 17-20 fathoms. 



Calliostoma trepidum, n.sp. 

 (Plate xvi., fig.3.) 



Shell small, thin, glossj'^ and showing a nacreous lustre exter- 

 nally. Whorls five, rounded, separated by a furrowed suture; 

 apex minute, rather tilted, unscalptured, of a whorl and a half. 

 Colour, pale purple on the spire, last whorl pearl-grey with small 

 scattered orange dots. Sculpture : on the base are eight spiral 

 beaded cinguli parted by narrow grooves; at the periphery the 

 sculpture changes abruptly; above this on the last whorl are six 

 narrow elevated crowded cinguli, the upper bordering the suture, 

 each bearing small sharp prominent tubercles, set in obliquel}''- 

 descending rows. On the upper whorls the cinguli aie fewer 

 and the tubercles proportionately larger. Aperture rhomboidal, 

 throat furrowed by the imprint of external sculpture, lip sharp, 

 serrate by the sharp ends of the revolving sculpture. Columella 



