AUSTRALIAN MALACOSTRACOUS CRUSTACEA. 207 
24. Plagusia glabra (Dana).—Rather common along the coast 
of New South Wales, where it is found in small rock-pools and 
crevices at low tide. It does not often leave the water, and is 
essentially a vegetarian. Legs and body are far more rotund than 
the preceding, and not at all setose. I am without doubt that 
- Milne-Edwards’ description of Heterograpsus octodentatus has 
been drawn from the young of this species. ‘There is a great 
difference between the colour of old and young specimens. 
Young ones are chiefly of a yellowish tinge, with black spots; 
while old ones are of a very dark colour, with traces of yellow 
on the metabranchial regions. They form most handsome objects 
in the water when the sun is shining on them, showing up their 
beautiful tints. Port Jackson, New South Wales. 
25. Mycteris longicarpus (Latr.).— Commonly designated the 
“Soldier Crab.” It is at once a marvellous and strange sight to 
see thousands of these crustaceans on the low mud-sand-flats, 
marching about in regular battalions after the tide has ebbed. 
_ Scarcely ever is one to be seen singly but it is scurrying off to 
meet a company; and here and there will be seen an extra large 
one, acting no doubt as an officer. Their military appearance is 
considerably heightened by the colours, which are as follows :— 
branchiostegites dark blue (these being very prominent); re- 
mainder of carapace pale blue; legs yellow, with a red band at 
each joint. Third pair of maxillipedes very large. Port Jack- 
son; Victoria. 
26. Mycteris platycheles (M.-EKdw.).—This species is found in 
very similar situations to the preceding, but has not so great a 
propensity for travelling in companies. Port Jackson. 
27. Hymenosoma varium (Hasw.). — This minute species 
undergoes a good deal of variation, and inhabits many different 
situations. Most frequently it is found in short seaweed just 
below low water, though I have procured it from amongst minute 
pebbles and from mud. Some specimens are beautifully marked. 
East coast of Australia, Tasmania, and New Zealand. 
Sub-order Macrura. 
Tribe ANOMALA. 
28. Hupagurus sinuatus (Stimpson). — This 1s one of the 
- commonest and most beautiful of our Hermit Crabs, frequenting 
