Vol. ve a 8-9.] Biological Work of the ‘* Investigator.’’ 343 
LV.S.] 
obtained in Byikhwaaw Bay on the mainland in possessing 
longer and more delicate spines, and were apparently of a differ- 
ent species. A species of Spatangid was also found on the 
North Moscos Islands. 
Motivusca.—The crevices and holes in the rocks were filled 
with large numbers of Chiton (Acanthopleura) spiniger, Sow. 
which the natives here collect and use as food. 
Potycouanta.—Examples of Serpulidae are common in the 
rock pools round the islands. 
Island it is almost completely absent, only one or two small 
isolated colonies being found in rock-pools at the north entrance 
to Port Owen. 
Numerous species were obtained on these islands belong- 
ing to the following genera :— 
Favia (two species). 
Fungia (a single species). 
Galaxia cs ag 
Goniastraea ,, 5 
Madrepora (several species). 
Porites (a single species). 
Symphillium (a single species). 
Turbinaria fe oe 
One of the examples of Madrepora was found to be infested 
with a barnacle, living in a small crater-like cavity at the tip 
of nearly every branch. This proved to be Pyrgoma madrepore 
Borradaile, a species hitherto known only from the Maldive 
Islands. 
mauve coloured tentacles, whereas in the second the colours 
were the exact opposite, the disc being a dull purple with 
green tentacles. 
Tavoy Island, Fisher Bay, (station 414). 
I landed here on November 20th 
rock; in the bay itself the shore consists largely of extensive 
mud-flats, which dry at low water, and intervening patches 
mud and stones. 
