476 Wiscoiisin Academy of Sciences, Arts, and Letters. 



The left fifth foot reaches to about one- third the length of 

 the second segment of the right exopodite. The second basal 

 segment is trapezoidal, its proximal end being the wider; the 

 lateral hair is near the distal end. The first segment of the 

 exopodite is longer than broad, the inner and outer margins 

 convex, and the inner margin setose. The inner margin of 

 the second segxuent is a semicircular setose pad; the segment 

 is terminated with a slender digitiform process and a long and 

 slender spine, the two forming a forcipate structure. The 

 endopodite is slender, one-segmented, longer than the first seg- 

 ment of the exopodite, and setose at the tip. 



Length of female, 1.39 mm. Length of male, 1.16 mm. 



This species was found in collections made by Prof. C. F. 

 Baker at Havana, Cuba. 



BIAPTOMUS PURPUREUS Sp. UOV. 



Plate XXV, figs. 4, 7. Plate XXVI, figs. 2, 5. 



A large species. The first segment of the cephalothorax 

 equals the three following. The second, third and fourth are 

 about equal in length, the fifth somewhat longer. The lateral 

 expansions of the last cephalothoracic segment are armed on 

 each side with a small, acute spine. 



The first segment of the female abdomen is longer than the 

 rest of the abdomen. The lateral dilatations are near the 

 proximal end of the segment, are not marked, and are armed 

 with small, acute spines. The second segment is short, being 

 only about one-quarter the length of the third. The third seg- 

 ment and the furca are nearly equal. The distal ends of the 

 furcal rami are wider than the proximal ; the inner margins 

 are ciliate. 



The antennae are 25-segmente(l, and in the female barely 

 reach the end of the first abdominal segment. The right an- 

 teana of the male is much swollen anterior to the geniculating 

 joint; the antepenultimate segment bears a recurved, hook- 

 shaped process which is about one-half the length of the penuh 



