Marsh—North American Species of Diaptomus. 471 
sharply curved at the middle that the two parts make very 
nearly a right angle with each, other. Its length equals that of 
the whole right foot. It is finely denticulate on the proximal 
half of the inner margin. The endopodite is short, stout and 
pointed, equaling in length the first segment of the exopodite. 
It is setose at the tip. The left foot reaches beyond the middle 
of the second segment of the right exopodite. The second 
basal segment is longer than broad, and nearly equals in length 
the corresponding segment of the right foot. The lateral hair 
is near the distal end. The first segment of the exopodite i3 
twice as long as wide, and setose on the inner margin. The 
second segment is spherical in form, setose on its inner margin, 
and is terminated by a setose finger-like process and a slender 
falciform spine. The endopodite is slender, equal in length 
to the first segment of the exopodite, and setose at tip. 
Length of female, 1.5 mm. Length of male, 1.25 mm. 
Locality, temporary pools near Lincoln, Nebraska. 
If D. albuquerquensis Schacht is identical with D. saltil- 
linus, this species is also found in Florida. The relationship 
of D. albuquerquensis Schacht to D. saltillinus is discussed un¬ 
der D. albuquerquensis. 
diaptomus adbuqueequensis Herrick. 
Plate XXIV, figs. 4, 7-10. Plate XXV, fig. 1. 
1895. Diaptomus albuquerquensis Herrick, p. 45; figs. 16-26. 
1895. Diaptomus albuquerquensis Herrick and Turner, p. 67; 
pi. VI, figs. 1-3; pi. VII, figs. 1-11. 
1904. Diaptomus Lehmeri Pearse, p. 889; figs. 1-4. 
Of moderate size. The cephalothorax is broadest at the mid¬ 
dle. The first segment is about equal in length to the three 
following. The last segment in the female bears a blunt dorsal 
tooth; the segment is expanded laterally, each wing bearing 
two rather prominent spines. 
The first abdominal segment of the female equals in length 
the remainder of the abdomen and the furca; it is dilated lat- 
