NEBALIAD^E. 31 



yellow colour, clouded with marks of a deeper hue. The 

 edges of the notch in posterior part of carapace are finely 

 toothed, those in the middle and posterior extremity being 

 the strongest and largest. The appendages of the first 

 pair of feet, or rami, are very long; the inferior being 

 frequently two inches in length ; the superior, one inch, 

 and curved, and the middle is about one third longer. 

 The caudal segment of body is short, and its two appen- 

 dages very long, being sometimes more than two inches 

 in length. The segments of abdomen are each studded 

 over with numerous, short, stout, hooked spines, of a dark 

 brown colour, while the long caudal appendages are fur- 

 nished with numerous short hairs, or setae. 



Hab. Pond on Bexby (Bexley?) Common, Rev. L. 

 Brown, 1767. Devonshire, Dr. Leach. Bristol, W. 

 Clayfield, Esq. Brit. Mus. 



Family 2 NEBALIAD Jl. 

 NEBALIA, Leach, Desmarest, Latreille, M. Edwards, fyc. 



Character. Antennae two pairs, large and ramiform ; 

 eyes, two, peduuculated ; feet, twelve pairs, 8 branchial 

 and 4 natatory ; carapace large, inclosing head, thorax, 

 and part of abdomen almost as in a bivalve shell. 



Bibliographical History. Otho Fabricius was the first 

 who described any species of this genus. In his c Fauna 

 Grcenlandica,' 1780, he mentions finding on the sandy 

 shores in Greenland, chiefly at the mouths of rivers, a 

 small Crustacean, occurring sparingly, which he describes 

 under the name of Cancer bipes. 



In 1796, Herbst, in his ' Krabben,' vol. ii, p. Ill, 

 describes the same animal, placing it among the Gam- 

 mari, under the name of Cancer (Gammarellus) bipes. 

 Montagu is the next author who has personally noticed 

 the genus, and is the first observer who has described it 



