440 MOLLUSCA FROM THE HOPE ISLANDS, N. QUEENSLAND, 



curvirostra Perry, General Conchology, 1811, PL xxxv., f.2. 

 Hilathilda eurytimii Melvill &l Standen, Journ.of Conch, viii. 1896, 

 p.310, Pl.xi., f.73, and Journ. Linn. Soc, Zool., xxvii. 1899, p.l70. 

 Contnmax decollatus Hedley, Mern. Austr. Mus. iii. 1899, p. 436, 

 f.25. 



A series of growth-stages sliows that the shells described by 

 Melvill & Standen and myself, as above, are merely the young 

 and decollate shell of this Cerithium. It has already been 

 reported from this coast by Brazier, who saw it at Darnley Island. 

 It is a characteristic associate of reef-coials, 



Triphora tribulationis, n.sp. 

 •> 



(Plate xl.,figs.53-54.) 



Shell small, narrowly conical, acuminate. Colour white, 

 irregularly splashed with rust. Whorls nine and a four-whorled 

 protoconch. Sutures deep. On the spire-whorls two rows of 

 beads, the upper the larger, within the row united by a broad 

 band, each bead linked to its fellow in the opposite row by a fine 

 radial thread, thus enclosing a deep square interstice. On the 

 antepenultiaiate a spiral thread arises between the bead-rows and 

 increases slowly to a full bead-row on the last whorl. Final U^ 

 there are six bead-rows, the basal three small. A secondary 

 sculpture of fine spiral threads is sometimes visible between the 

 beads. Protoconch : first whorl round and smooth, remainder 

 keeled and crossed by hne radial threads. Aperture subcircular, 

 deeply notched above, canal much recurved, projecting as a spur, 

 closed at the base. Length 4*25; breadth 1*25 mm. 



Several specimens, off the Hope Islands. I found it also on 

 the reef at Mast Head Island. 



Cerithiopsis pinea, n.sp. 



(Plate xh, fig.55.) 



Shell small, solid, the shape of a pine cone. Colour purple 

 with cream beads. Whorls six, with a many-whorled subulate 

 protoconch [mutilated in the specimen seen]. Sculpture : pro- 



