204 THE ZOOLOGIST. 
8. Neptunus sanguinolentus (M.-EKdw.).—This species is rather 
common, and specimens of a small size are extremely abundant. 
But few of them arrive at a large size. This falling-off, I think, 
is mainly due to the attacks of its congener the quarrelsome and 
almost ubiquitous WN. pelagicus, which species is a great check on 
the diffusion and growth of very many of the pelagic Crustacea. 
Not being so good—from an epicurean point of view—as N. pe- 
lagicus, it is but little sought after. It has an extremely beautiful 
appearance, the carapace showing iridescent colours, and having 
on it three spots like drops of blood, surrounded by bluish white 
rings, one on either side on the epibranchial regions and one 
almost on the posterior border of the carapace, over the intestinal 
region. It leads a pelagic life, and is widely disseminated. 
9. Charybdis cruciatus (Herbst.).—This is, in my opinion, the 
most beautiful of our Crustacea. When fresh, its rich tints cannot 
be surpassed by anything in Nature. It may be seen occasionally 
in company with N. pelagicus at the fish-market, but is very un- 
common. I have never found it in its young state. 
10. Scylla serrata (De Haan).—This is the largest Crab to be 
seen in the Sydney fish-market. Like N. pelagicus, it is pelagic, 
but is not nearly so common. The carapace is generally of a dark 
green colour. It has a wide distribution, reaching from Japan to 
Australia. Around the anterior border of the carapace there is a 
row of sharp conical spines. Any refractory prisoner is quickly 
put an end to by being pressed against these. 
11. Thalamita suma (M.-Edw.).—Does not attain a large size, 
and is essentially pelagic. It is rather common in our bays 
and harbours. Carapace and chele shortly setose, and of a 
greenish hue. 
12. Thalamita admete (Herbst.).—This is a very small pelagic — 
Crab. I have observed it in tiny pools in rocky situations at 
Port Jackson. , 
13. Nectocarcinus integrifrons (M.-Edw.). — Though adapted 
for a free-swimming existence, this species lives to a great extent 
on the bottom in shallow water, amongst seaweed. It is not of 
uncommon occurrence for green Fucus to be found growing on its 
legs and carapace, which are very setose. Hast coast of Australia 
and New Zealand. 
14. Platyonychus bipustulatus (M.-Edw.).— This pelagic spe- 
