14 The N.Z. Journal of Science and Technology. [Jan. 
few larger granules arranged in two longitudinal lines. In that part of 
the body there are also some fine short hairs, which vary in abundance 
and seem better developed in the New Zealand specimens than on some of 
the Australian ones. 
The bores made by the Sphaeroma quoyana are very much larger than 
those made by Limnoria, and are approximately the same size as those 
usually made by the ship-worm, or Toredo. The photo (fig. 12) shows a 
piece of sandstone from Queen Charlotte Sound bored by Sphaeroma 
quoyana, the head of one of which can be seen in the bore a little above 
and to the right of the centre of the block. In this piece of sandstone 
the bores vary in size, the majority being 6-7 mm. in diameter, though 
Fig. 12.— Piece of sandstone from Queen Charlotte Sound bored by Sphaeroma 
quoyana M.-Edw. The head of one of the animal? can be seen in the bore a 
little above and to the right of the centre of the figure. 
there are some smaller and one or two as small as T5 mm. Presumably 
the smaller bores are made by the younger and smaller animals, for all of 
them appear to have been made by the Sphaeroma, and there is no sign 
of any other borer. 
With Sphaeroma quoyana, there is constantly associated the minute 
Isopod lais pubescens Dana var. longistylis Chilton (1912, p. 132). This 
animal is generally found on the ventral aspect of the Sphaeroma, among 
the bases of the legs, and should rather be called a commensal than a 
parasite, as it derives no sustenance from the Sphaeroma. It is probably 
this animal that is referred to by Mr. Hedley when he states that the 
Sphaeroma from Sydney Harbour was always associated with “ a minute 
crustacean identified for me by Mr. Whitelegge as Janira sp." (1901, 
