119 
The genus may be briefly characterised in the following 
manner : - - 
Family Mahd^.. 
Genus Halimus, Latreille. 
Carapace sub-pyriform, more or less acutely pointed 
medianly on the posterior border. 
Rostral horns divergent, and sometimes depressed. 
Orbits incomplete, especially below. 
A large lateral spine on the hepatic region. 
Three lateral spines on the branchial region. 
The basal antennal joint with a spine on its external dis- 
tal angle. 
The external maxillipeds with the ischium joint much 
produced at its internal distal angle, the merus joint rounded 
and produced at its external distal angle, truncate at the in- 
ternal angle. 
Sub-hepatic and pterygostomial regions each with a more 
or less conical tubercle. 
Chelipeds usually weak in the females and some males ; 
in other males much enlarged. 
Ambulatory legs long, the joints cylindrical, except the 
propodi, which are more or less expanded towards their dis- 
tal ends. 
Pleon seven-jointed in the males. 
Halimus loevis, Uaswell. PI. xxi. , figs, i, \a. 
(Pr. L.S., N.S.W., Ser. i., vol. iv., p. 435.) 
This species is very variable, especially as to size. The 
chelipeds of the males are sometimes normal, sometimes mas- 
sive. 
The following characteristics, in addition to those given 
by Professor Haswell, are tolerably constant in a moderate 
series of examples noted. 
The rostral horns project horizontally. The anterior 
portion of the carapace is well depressed from the middle of 
the gastric region forwards, and with a less curve behind. The 
inter-ocular tubercles are large. There is one well-marked 
but low tubercle on each epibranchial region, two more 
faintly marked on the mid-branchial, obliquely placed. A 
pair of transverse, separate tubercles on the cardiac region, 
one median conical tubercle on the intestinal region, and 
between this and the cardiac pair a faint indication of a pair 
of transverse tubercles ; these are more pronounced in some 
specimens. The tubercles have a tendency in old speci- 
mens to become worn away. The branchial reo'ions are 
marked off from the urogastric and cardiac by a row of pits 
