Ci gs eit eae eae 
ENTOMOSTRACA OF MINNESOTA. 121 
short, especially the last segment, with is toothed behind; stylets very 
short. The antennze are much shorter than the first segment, 11- 
jointed. The maxillipeds are very small. All the feet are armed 
with a row of very large teeth or lanceolate spines down one side; fifth 
foot one-jointed, with three spines, the outer being smooth, the others 
spiny; egg-sacs variable, narrow, appressed; eggs large, color usually 
dark. The animal moves like Canthocamptus, and is able to progress 
out of water better than other species. The following measurements 
will give an idea of the proportions: Length 1.26 mm., thorax 0.76 
mm., abdomen 0.44 mm., stylets 0.06 mm., longest seta 0.34 mm., an- 
tenne 0.28 mm., width of thorax 0.44 mm.’’ 
Measurements of another specimen are as follows: Length 1.1mm., 
thorax 0.65, first segment 0.33, abdomen 0.45, longest seta 0.6. 
The male is more slender (0.93 mm. long) and the longest caudal 
seta greatly exceeds in length the whole abdomen. The antennez are 
strongly modified. 
*Cyclops fimbriatus Fischer. 
PLATHS XVII, Kies, 8, 9; X XI, Fie. 11; XXV, Fies. 9-14. 
Herrick ’82 (crassicornis), and ’84 and ’87{; Turner ’92; Marsh ’93. [The manuscript 
gave not the slightest hint as to date or reference in the following, given in the 
order of the manuscript: ] Mueller (crassicornis); Fischer; Sars (crassicornis); Hel- 
ler (gredleri); Fric (pauper); Uljanin (crassicornis); Brady (crassicornis, and 
fimbriatus); Rehberg (poppei, and fimbriatus); Daday (fimbriatus, and margoi); 
Vosseler; Schmeil; Richard. 
A-small species (0.8 to 0.9 mm.). Thorax oval, not greatly ex- 
panded, angles of segments rather prominent. First thoracic seg- 
ment forming about half the length of the cephalothorax. Abdomen 
rather long and thick, terete, about as long as the thorax. Last two 
abdominal segments armed with a row of spines at the caudal margin. 
Caudal stylets twice as long as the last abdominal segment. 
A series of small teeth in a longitudinal series generally ornaments 
the stylet. Lateral spine small. The outer apical spine strong, the two 
median sets long, spinously armed, inner two-thirds as long as the 
outer. Inner apical seta weak and short, pectinate. Antenne shorter 
than the first segment, 8-jointed; formula: --x—-~-=~, the basal 
joint with a small semicircular series of fine bristles. Antennules 
‘short, apical segment short with but two strong sete and several 
smalier ones. Feet armed with spines and bristles. Formule for 
fourth foot as follows: 
ex. 2 spines. ex. 1 seta. 
Outer ramus {sp 1 spine, 1 seta. Inner ramus jap. 2 spines. 
in. 4 sete. in. 2 sete. 
{ By a curious mistake in this paper on p. 14, the reference to Plate VII, Fig. 2, is placed opposite 
C. fimbriatus and not, as it should be opposite Cc. phaleratus.~ This mistake was then TepEadeaed in 
the description of plates, p. 56. 
