NOTES ON A RARE LORICATE. 
Acknowledgments . — The writer here expresses his obligation 
to Mr. Tom Iredale, Conchologist, Australian Museum, for a 
most helpful criticism of manuscript and for comparisons of a 
Magnetic Island shell with the type from Darnley Island. He 
is also indebted to Miss Joyce K. Allan, of the Australian 
Museum, for three beautiful figures. 
Plate XVI. 
Rhyssoplax excellens Iredale and Hull. 
Fig. 1. Whole shell seen from above. X5 approx. 
Fig. 2. Whole shell, side view, x 5 approx. 
Fig. 3. Girdle scales, x 17 approx. 
Fig. 4. Half median valve, x 24 approx. 
(Figs. 1, 3 and 4 by Miss Joyce K. Allan ; fig. 2 by the writer.) 
All figures were drawn from shell No. 3161 in the writer’s 
collection, which is in the care of the National Museum. 
[153J 
