540 Transactions 
worms. With them, though rare, are brittle-stars belonging to a long- 
and worm-tubes. А crab lives commensally within the Pinna shell. 
ы i . LE 
sand are Dosinia subrosea (some with shells stained black), Tellina liliana 
(68 mm. in 
Gasteropods occurring in this association belong to two groups—firstly, 
the sand-dwelling species proper, including Alcithoe arabica, Struthiolaria 
* or occasionally just below it, preying on pelecypods, especially муе 
striata. Its shells are usually covered with slime and minute algae, and 
occasionally there may be some small Elminius. 4 
Hermit-crabs (Eupagurus novae - zealandiae) are common on the hio 
flat, occupying gasteropod shells mainly belonging to species inhabiting the 
adjacent coast. Starfishes—Patiriella regularis and Asterias calamari 
roam about near low-tide mark. Occasionally the curious Callianassa 
filholi is found. 
Antigona Association. 
Tauranga.—Sandy mud, black a little way beneath the surface, pon 
describes best the extensive flats not occupied by Zostera between tide- 
beneath the surface Antigona strutchburyi abounds. The shells are usually 
