476 Wisconsin 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 segment 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. 
DIAPTOMUS PTJRPUBEUS Sp. nOV. 
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 
fureal rami are wider than the proximal; the inner margins 
are ciliate. 
The antennae are 25-segmented, and in the female barely 
reach the end of the first abdominal segment. The right an¬ 
tenna 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 penui- 
