TO BE HANDLED WITH CARE 283 
may be clasped back into a deep groove in the outer mar- 
gin of the joint next but one preceding it. The three 
following pairs of limbs are very much smaller, the ter- 
minal joint finger-like and clasping against the much 
dilated preceding joint. ‘The next three pairs of legs are 
slender and four-jointed, with a slender exopod on the 
second joint. ‘The very large pleon has the centre of the 
back smooth, but four carinz on each side, which com- 
mence indeed on the last three segments of the trunk, but 
are not continued on to the telson. This latter has a power- 
ful central carina ending in a tooth a little before the apex 
is reached. Between the strong submedian spines there 
are eight minute dentic'es, and between each submedian 
and its corresponding intermediate there are nine denticles. 
Another Mediterranean species, also occasionally found on 
the Enelish coast, Sguilla Desmarestii, Risso, is distin- 
guished by having only five teeth on the claws, and fewer 
longitudinal keels on the first five segments of the pleon. ° 
In the United States Squilla empisa, Say, is often thrown 
on the beaches by the waves, and it probably burrows near 
low-water mark or not far out beyond it. Large speci- 
mens, Professor Smith says, ‘are eight or ten inches long 
and about two broad.’ After describing the second maxilli- 
peds as much in accordance with those of Syuilla mantis, 
he remarks :—‘ By means of this singular organ they can 
hold their prey securely, and can give a severe wound to 
the human hand, if handled incautiously. It also uses the 
stout caudal appendages, which are armed with spines, very 
effectively. The body is usually pale green or yellowish 
green, each segment bordered posteriorly with darker green 
and edged with bright yellow; the tail is tinged with rose 
and mottled with yellow and blackish; the outer caudal 
lamellze have the base and spines white, the last joint yel- 
low, margined with black ; the inner ones are black, pale at 
base ; the eyes are bright emerald-green ; the inner antenne 
are dark, with a yellow band at the base of each joint ; and 
the flagellum is annulated with black and white.’ Squilla 
armata, Milne-Edwards, is another species very little re- 
mote from Sguilla mantis, but among other differences the 
