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ENTOMOSTRACA OF MINNESOTA. 59 
Diaptomus salinus Daday. 
PLATE VIII, Fia. 3. 
Daday ’85°; De Guerne and Richard ’88! (D. blanchardi), and ’89. 
This species was found by Daday in Forda, Hungary, and is identi- 
fied with the form subsequently described by De Guerne and Richard 
as D. blanchardi. It may be recognized by the sharp spines on the 
right side of the first and second segments of the abdomen (affording 
a transition toward Heterocope and Epischura), and also by the pecu- 
liar armature of the male fifth feet, which have accessory processes 
-upon the basal joint of the right limb and the second segment of its 
outer ramus. The apical segment of the outer ramus of the fifth feet 
of the female are unusually well developed. The antepenultimate 
segment of the male geniculate antenna has a very long straight pro- 
cess, longer than the two following segments. Length of female 2.2 
mm. The veryshort antenne and saline habitat further distinguish it. 
Diaptomus laticeps G. O. Sars. 
Sars ’63; De Guerne and Richard ’&89. 
This species, which is widely distributed in Europe, has the front 
considerably dilated. The antenne are as long as the body. The 
caudal stylets as long as the two preceding combined. The antepe- 
nultimate of the geniculate antenna has a process shorter than the pe- 
nultimate segment. The male fifth foot has armature similar to D. 
salinus. Length 1.5 mm. 
* Diaptomus minutus Lilljeborg. 
PLATE VIII, Fie. 9. 
De Guerne and Richard ’89; Marsh ’92 and ’93. 
One of the smallest species of the genus, originally taken in Green- 
land, but widely distributed in the northern regions. Slender, with 
the greatest width behind the middle. The fourth and fifth thoracic 
segments fused or more or less distinct in the old, with small mucron- 
ate lateral lobes. First segment of the abdomen as long as the re- 
mainder, expanded anteriorly and armed with small spines. Second 
and third abdominal segments partly fused, the second very short. 
Caudal stylets twice as long as broad. Antenne 25-jointed, some- 
what longer than the stylets. Antepenult segment of male antenna 
with a long slender process, nearly as long as the two following seg- 
ments and slightly hooked at the tip. The external ramus of the fifth 
foot of the female is two-jointed, with ashort claw, the inner ramus is 
small and one jointed. The left fifth foot of the male is much shorter 
than the right, and its apical segment is armed with a spiny pad and 
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