STALK-EVED CRliSTACEA 269 



sometimes much broader, and at the base nearly equaUing 

 one-third of the width of the carapace at the anterior 

 margin. The orbits are very large, and extend along the 

 whole anterior surface of the carapace, between the front 

 and the antero-lateral margins. The eye-peduncles are 

 very slender and elongated, reaching, or nearly reaching, 

 the antero-lateral angles of the carapace. 



The flagella of internal antenna; are usually somewhat 

 obliquely plicated. The basal joint of external antennae 

 is small, and placed beneath the base of the eye-peduncles ; 

 the flagella are of moderate length. 



The longitudinal ridges of the endostome are usually 

 more or less distinctly developed. The third joint of the 

 external maxillipedes is much larger than the fourth, and 

 is not produced at its antero-internal angle ; the fourth 

 joint is small, usually transverse, distally truncated, and 

 not emarginated at the antero-internal angle, where the 

 next joint joins it. 



The first pair of legs is unequally developed ; the 

 fourth joint of the larger is usually triangular on section, 

 and prolonged beyond the antero-lateral angles of the 

 carapace ; the next joint is moderately elongated, and has 

 usually no spine on its interior surface; the hand is 

 compressed and very large, usually greatly exceeding in 

 length the three preceding joints ; the palm is much 

 shorter than the fingers, and is usually obliquely cristated 

 on the inner surface ; the fingers are distally acute or sub- 

 acute, granulated, and usually lobate on the inner margins ; 

 in the smaller hand (and in both hands in the female) the 

 joints are slender and feeble. The walking legs are of 

 moderate length ; their fourth joint is compressed, and 

 the terminal joint styliform. 



The abdomen of the male is seven-jointed. 



Range. — In temperate and tropical regions. 



