70 
LEACH’S P OR CELL ANA . P. Leachii, Gray’s Zool. 
Misc., p. 15. Conmion. 
Beside these I possess a spcimen of a minute species which, 
though much resembling the latter, yet differs from it in seve- 
ral particulars. The Carapace advances further in front, 
where it is divided into three scarcely separated portions, 
somewhat resembling the P. Longicornis : and retiring from 
this it turns off angularly towards the eyes. On the ridge of 
the second section of the handlegs are two well marked spines ; 
the three remaining are rather shorter than in the last species 
and margined thinly with hairs, whereas in the other they arc 
smooth. I found this specimen on a coralline from deep water, 
and in ignorance of its being hitherto described, I have pro- 
visionally named it 
P. Acanthechelcs. Couch’s M.S. and fig. 
FAMILY of MACRO URES. 
This is divided into the following sections : 
CUIRASSIANS: crust remarkably thick and hard; cara- 
pace depressed and wide; without a moveable scale below 
the second pair of antennae. 
ASTACIANS: crust firm; body lengthened and somewhat 
compressed ; abdomen large, but less developed in propor- 
tion to the thorax than in the salicoques ; a moveable scale 
below the outer antenna;. 
SALICOQUES : the body compressed laterally; abdomen 
large, its covering horny; scale below the outer antenna; 
large, the natatory false legs covered by the lateral enlarge- 
ment of the abdominal rings. Caudal fan large. 
The Cuirassians are further divided into the following 
sub-families : 
GALATHEANS: fifth pair of legs slender and not fit for 
walking, but bent up under the base of the preceding. 
LANGOUSTIANS : fifth pair of legs as the others, and not 
bent up ; hands with an imperfect finger, the other legs 
without that organ. 
GALATHEANS. 
GENUS GALA THE A : the carapace covered with trans- 
verse sections edged with short hair; snout advanced and 
s pinv ; half of the abdomen permanently bent under. 
PLATED LOBSTER. G. Strigosa. M. Edwards’ Crust , 
vol. 2, p. 273. G. Spinigera, Leach’s Malac., pi. 28. Pen- 
naut, pi. 14, fig. 26. 
Common and in its younger state not easily distinguished 
from the next species. It is incapable of any motion but 
backward, and rarely rises above the bottom, where by a la- 
borious motion of its tail it contrives to retreat from its ene- 
mies; but its usual progress is creeping, and by the legs only. 
