446 STALK-EYED CRUSTACEA 



side near the middle, another at the base just above the 

 eye, and a smaller one in a line behind the last mentioned. 

 First pair of legs armed with a small tooth on the lower 

 distal angle of the fourth joint, and another on the upper 

 distal angle of the fifth joint. Coxal plates of the abdo- 

 men terminate behind in a sharp point, the anterior edge 

 of the first plate being slightly toothed, the other smooth. 

 Range. — Bermuda. 



Family III. Astacida^. - 



Astacid(B . . Dana, Miers, Spence Bate. 



Body elongated, subc)-lindrical ; carapace rostrate. 

 Rostrum depressed, armed with few teeth. External 

 antennae long, with a basal scale. First pair of legs 

 large, with a well developed pincer ; second and third 

 pair slender, with a small pincer ; fourth and fifth pair 

 nearly always simple. Abdomen of nearly the same 

 width as the body throughout. Fresh water forms. 



Range. — Lakes and rivers of Europe, Asia, North 

 and South America, West Indies, Madagascar, Australia, 

 Tasmania, New Zealand. 



Synopsis of the Genera. 



A. The first pair of abdominal appen- 

 dages, in the male, modified for sexual 

 purposes. The movable finger of the large 

 hand has its outer margin straight or in- 

 flexed. There is no gill attached to the 

 body wall. 



Range. — North America. — {Caiiibariis.) 



B. The first pair of abdominal ap- 

 pendages wanting. The movable finger 

 of the large hand has its outer mar- 

 gin convex. There is always one or Cambams. 



