MONSTER PRAWNS 247 
the carapace armed with two antennal teeth, one 
above the other; the second trunk-legs with the 
wrist long. 
Palemonella, Dana, 1852, has one tooth on the frontal 
margin, and a second on the hepatic region nearly 
in the same horizontal line ; the second trunk-legs 
with the wrist not long. 
Drachycarpus, Spence Bate, 1888, has one tooth on the 
frontal margin, and a second on the hepatic re- 
gion, below the horizontal line ; the second trunk- 
legs with the wrist short. 
Palemon carcinus is found in American rivers ; Palcemon 
lar, the second in the list of Fabricius, in the East Indies. 
Palemon jamaicensis has been obtained by Mr. Osbert 
Salvin from Lake Amatitlan, ‘where it reaches a large 
size and forms an important article of commerce in the 
market at Guatemala.” Of Palcemon heterochirus, Wieg- 
mann, Stimpson remarks that ‘this is another of the 
large freshwater shrimps of Mexico. They frequently 
attain a length of two feet, including that of the chelopoda, 
which are at least as long as the body.’ Other species 
range over the isles of the Pacific and Australia. In this 
genus the most striking feature is the elongation of the 
second legs in the male, which not infrequently even 
exceed the total length of the animal’s body; a specimen 
of Paleemon lar may measure about five inches from the 
front margin of the carapace tothe tip of the telson, and 
carry limbs eight inches long. 
Palemonella, Dana, has the rostrum slender instead of 
deep as in the other three genera, and the ‘ palp’ of the 
mandible perhaps only two-jointed instead of three-jointed. 
Dana’s two species tenuipes and orientalis are both from 
Eastern waters. 
To Leander must be transferred the three species which 
Bell calls Palemon serratus (Pennant), Paleemon squilla 
(Linn.), and Palemon Leachii, Bell, the last of these be- 
coming Leander Fabricia (Rathke). Norman now considers 
that his Palemon minans from Guernsey, may be merely 
an abnormal specimen of Leander squilla. Puleemon varians, 
