Decapod Crustacea of Bermuda, Part II. 145 



Mandibles have a 3-jointed palpus. The rostrum is toothed. 

 Most of the species are essentially inhabitants of fresh or brackish 

 water, though they may occur in small streams on remote islands, 

 or off the mouths of rivers in brackish or sea water. Some, like 

 B. savignyi, are true marine species. Perhaps some others live in 

 the sea only while young. 



The genus is circumtropical, and many of the species are very 

 widely distributed on the oceanic islands, as well as on the conti- 

 nents. There being no fresh-water streams in Bermuda, the 

 several large fresh-water species found in the West Indies are 

 naturally lacking. Many species become large and are used as 

 food in various countries. 



Palaemon savignyi (Bate). Long-clawed Shrimp. 



Brachycarpus savignyi Bate, Voy. Challenger, Macrura xxiv, pp. 795, 

 800, pi. cxxix, fig. 4, 1888 (Bermuda). 



Pal&mon savignyi Rankin, Crust. Bahamas, Ann. N. Y. Acad. Sci., xi, 

 p. 224, 1898. Verrill, these Trans., x, p. 579, 1900 (Bermuda). 



Bithynis savignyi M. J. Rathbun, Brach. and Macr., Porto Rico, p. 124, 

 1901. 



FIGURE n. Pal&mon savignyi. After Bate. 



This species is readily distinguished from its allies by the smooth 

 body and very large legs of the second pair, which have a long 

 cylindrical chela and a short carpal segment. Those of the first 

 pair are slender with small hairy chelae. 



The rostrum, which is straight, extends back in the form of a 

 dorsal carina to the middle of the carapace and has seven teeth 

 above, of which three are over the carapace ; there are three on the 

 lower edge of the rostrum. 



