34 MARGUERITE HENRY. 



nine segments, some of which are very small, the last three 

 bear sensory appendages; the second section is swollen 

 and consists of six segments; the terminal part is curved 

 and consists of two long segments. 



The natatory legs are armed as in the female, but the 

 spine on the basal segment of the fourth pair is not present. 



The fifth pair of legs (fig. 7) are strongly built, the right 

 being the longer. In both legs the inner and outer rami 

 are composed of three segments. In the right leg, the 

 terminal segment of the outer ramus is small and bears one 

 long spine; the second and third segments each bear a 

 denticulated spine on the outer edge; the inner edge of the 

 third segment is produced into a short pointed projection. 

 The inner ramus is smaller, it bears only setae on the ter- 

 minal segment. The left leg is shorter, its outer ramus is 

 very stout. Each segment of the outer ramus bears a 

 denticulated spine on the outer edge, while the third seg- 

 ment bears two terminal spines as well; the inner ramus 

 is smaller; its third segment bears a short spine. 



Specific Characters. — Female, Body moderately robust 

 with the anterior division oval in form, narrower in front 

 than behind. Lateral parts of the last thoracic segment 

 slightly expanded, rounded, each bearing one or more small 

 spines; abdomen consisting of four segments. Genital 

 segment widening posteriorly. Caudal rami very long, 

 with hairs on the inner and outer edges. Caudal setae of 

 equal length. Antennules reaching as far as the middle of 

 the genital segment, consisting of twenty-five segments. 

 Natatory legs with both rami composed of three segments; 

 outer rami with long coarsely denticulate terminal spines; 

 fourth pair, each with a long curved spine on the basal 

 segment. Last pair of legs smaller, outer ramus armed in 

 the same manner as in the other legs, but also possessing 

 a curved spine on the inner edge of the middle segment. 

 Ovisac present, ventral in position. Length 1"3 mm. 



