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MODERN SYSTEM. 
Subclass II. MALACOSTRAC A. 
A very valuable work is now publishing by Dr. Leach, in quarto, anti 
illustrated with highly finished engravings, entitled, Malacostraca 
Podopiithalma Britannia:., in which the whole of the indigenous spe- 
cies hitherto discovered of this subclass are figured. It is necessary to 
state that this gentleman has spared neither pains nor expense to ren- 
der the work complete, having with unexampled zeal and perseverance 
amassed together one of the finest collections ever formed, which is, 
with the remainder of his cabinet, consisting of insects, shells, S.r. de- 
posited in the British Museum, and, under certain restrictions, may 
always be consulted by students of Zoology. 
Legion I. PODOPIITHALMA. 
“ The Malucostruca Podophthalma include those animals which, in 
common language, are denominated Crabs, Lobsters, Cray-fish, Prawns, 
Pandals, and Shrimps, all of which have the power of reproducing their 
claws when they arc lost.” 
Order I. BRACIIYURA. 
A. Abdomen of the male five-jointed, the middle joint longest ; of the 
female seven-jointed. Anterior pair of legs didactyle. ( Shell trun- 
cate behind. Two anterior legs of the male elongate, of the female 
moderate.) 
Fam. I. Corystid®. Leach. 
Antenna long, ciliated on each side. 
Genus 1. CORYSTES. Lute., Leach. 
External antenna longer than the body ; the third segment composed of 
elongate, cylindric joints : external double palpi with the external foot- 
stalk narrow; the second joint largest, having its internal side deeply 
emarginate : anterior pair of legs, of the male twice the length of the 
body, subcylindric, the hand gradually somewhat thicker and some- 
what compressed; of the female, of the length of the body, with a 
compressed hand: other legs with tibia; and tarsi of equal length i 
claws elongate, straight, acute, and longitudinally snlcated : abdomen, 
of the male, with the first joint linear-transverse; the second longer, 
and produced on each side; third, nearly equally quadrate; the fourth 
transverse, and narrower than the third; the filth narrower, nearly 
triangular, with the tip rounded; of the female, with six joints trans- 
verse, arcuated in front; seventh triangular, with the apex rounded 5 
shell oblong-ovate, anteriorly slightly rostrated, behind margined: 
