82 MODERN SYSTEM. 



Subclass II. MALACOSTRACA. 



A very valuable work is now publishing by Dr. Leach, in quarto, and 

 illustrated with highly finished engravings, entitled, Malacostrac.\ 

 PoiioPiiTiiALMA Britann!.-!;, 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 e\ er formed, which is, 

 with the remainder of his cabinet, consisting of insects, shells, &c. de- 

 l>osited in the British Museum, and, under certain restrictions, may 

 alw ays be consulte^l by students of Zoology. 



Legion I. PODOPHTH ALM A. 



" The Mulucoatnica Podophthdma include those animals which, in 

 conmion language, are denominated Crabs, Lobsters, Cray-fish, Prawns, 

 I'andals, and Shrimps, all of which have the power of reproducing their 

 ciaws when they are lost." 



Order I. BPtACHYURA. 



A. Abdomen of the male five-jointed, the middle joint longest; of t/te 

 feimile seven jointed. Anterior pair of legs didactyle. {Shell //'«/*- 

 cate behind. Two anterior legs of the male elongate, of the femiik 

 moderate.) 



Fam. I. CoRYSTiD.E. Leach. 



Anteniuc long, ciliated on each side. 



Genus L CORYSTES. Latr., Leach. 



Eiiernal antenna; longer than the body ; the third segment comi>osed 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 (f 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 ecpial length : 

 ckzcs elongate, straight, acute, and longitudinally sulcated : abdomen, 

 of the male, with the first joint linear-transverse; the second longer, 

 and produced on each side ; third, nearly equally quadrate; the fourtii 

 txansverse, and narrower than the third ; tlie fifth narrower, nearly 

 triangular, with the tip rounded ; of the female, with six joints trans- 

 verse, arcuated in front; seventh triangular, with the apex rounded : 

 sAt7/ oblong-ovate, anteriorly slightly rostrated, behind maigintd: 



