ENTOMOSTRACA OF MINNESOTA. 117 
Cyclops gracilis Lilljeborg. 
PLATE XIX, Fies. 10, 11. 
Lilljeborg 753; Schmeil ’91 (diaphanus), and ’92. 
Apparently this is a distinct species, characterized by the slender 
form, especially of the abdomen, which is to the thorax as 5: 7, di- 
vergent cylindrical stylets, short setze and form of the fifth foot and 
receptaculum. The antenne are slender, reaching the caudal border 
of the fourth segment, and are of the form of the 12-jointed species; 
POTD, 23, =__=<==. Fifth foot with a broad basal segment 
and a cylindrical terminal one, which bears a short spine and a long 
seta. Eggs few. Feet all two-jointed. Schmeil speaks of the fifth 
foot as one-jointed, but the fact that the basal segment is immovably 
soldered to the body should not prevent us from recognizing its 
existence. This species has been found only in Sweden, Poland and 
Germany. 
Cyclops diaphanus Fischer. 
PLATE XIX, Fiaes. 6-9. 
Fischer 753; Claus ’63 (minutus); Heller ’63 (minutus); Daday ’85° (frivaldszkyi); 
Sostaric 788; Schmeil ’92. 
The above synonomy is derived from Schmeil’s monograph, which 
can hardly be considered very authoritative since its author never 
saw the species and offers only comparative data to discriminate this 
species from the last. Abdomen broader than C. bicolor, stylets as 
long as the two preceding segments, lateral seta nearer the base than 
the end. The lateral apical sets short, equal, median set as 2 : 3. 
Antenne 11-jointed, short, only reaching the second segment. Swim- 
ming feet with two-jointed rami. Fifth foot with a short spine and 
long seta at the end of the cylindrical apical joint. 
* Cyclops affinis Sars 
PLATE XXX, Fias. 9-11. 
Sars 63; Uljanin ’75; Brady ’78; Rehberg ’80 (pygmzeus); Daday ’85° (pygmeeus, 
and affinis); Herrick ’84; Vosseler ’86; Lande ’90; Richard ’91; Brady 791; 
Schmeil ’91 and ’92. 
Schmeil makes the statement that ‘‘ Herrick regards C. affinis as 
‘var. b.’ of C. phaleratus Koch, and identifies it with his C, adolescens,”’ 
overlooking the plain statement that ‘‘it is impossible to sufficiently 
identify it [the American form] with any of the above,” and the fact 
that Sars’ description was appended in a separate rubric. Schmeil 
devotes considerable time to the relations of C. adolescens and is not 
unnaturally provoked by the inconsistencies in the two references, 
which are explained, however, by two provoking typographical errors 
