118 GEOL. AND NAT, HIST. SURVEY OF MINNESOTA. 
which were both beyond the writer’s control. The first was the dis- 
placement of a line in the tabulated list of species in the Alabama 
crustacea, by means of which the figure of C. phaleratus was referred 
to C. fimbriatus and the error then repeated in the making up of the 
description of plates; second, in the Final Report, Plate 24, in Fig. 15 
the printer has set C. adolescens one line too soon, making the figure 
of the receptaculum of C. parcus refer to the former species. Upon 
this point Schmeil remarks, ‘‘Schon hieraus ergiebt sich * * * 
mit welcher sorgfalt Herrick die Zeichnung angefertigt hat!’? We beg 
that author to transfer his irritation to the typo, and believe that the 
drawing in question is substantially correct!} As to the position of 
C. adolescens, more beyond. 
The original description of Cyclops affinis Sars is here repeated, and 
it justifies the doubt which, in the absence of authentic specimens or 
figures, was felt respecting its position. 
““Antecedenti [C. phalerato] simillimus. Corpus autem minus robustum colore 
cceruleo vel potius glauco sat saturato insigne. Segmentum ultimum thoracicum ad 
marginem posteriorem extrosum pilis vel spinulis subtilissimis pectenatim exornatum. 
Rami caudales quam in C. phalerato aliquanto longiores, setarum apicalium interna 
quam externa multo breviore, intermediarum interiore altera fere triplo longiore 
longitudinemque abdominis superante, in medio aculeata dein vero subtile ciliata. 
Antenne 1-mi paris segmento 1-mo corporis multo breviores, tenues, articulis 11 com- 
posite. Pedes 5-ti paris distincti, uniarticulati, setis 3, quarum interior ceteris multo 
major et ciliata, instructi. Sacci oviferi parvi abdomini appressi. Longit. circit. 
3 mm.”’ 
From (C. phaleratus, which it closely resembles, it differs, according 
to Schmeil, in its more slender form, short stylets with single oblique 
series of spines, peculiar shape of the fifth foot and the method of 
motion and also especially in the number and relative length of the 
antennal joints and the form of this organ in the male. 
The formula for the length of the antennal joints in C. affinis is 
Se SUL = while that of C. phalerahisis =2 oe 
The fifth foot is one-jointed, and this joint is quadrate with three 
spines apically. The stylets are twice as long as broad and are orna- 
mented by an oblique line of small spines. The receptaculum is smilar 
in form to that cf C. phaleratus. The motion is a creeping or slow 
swimming near the surface. Length 0.85 mm. 
* Cyclops bicolor Sars. 
PLATES XVIII, Figs. 3-3e; XXI, Fia. 12. 
Sars ’63; Rehberg ’80 (diaphanus); Herrick ’84 and ’87 (diaphanus); Daday ’85° 
(diaphanus); Lande ’88 (diapbanus); Richard ’91 (diaphanus); Schmeil ’91; 
Marsh ’92. 
DESCRIPTION OF THE FEMALE: The body, not including the cau- 
dal setze, measures from 0.65 to 0.80 mm. The following are measure- 
{Very curiously in Schmeil’s reference to figures, p. 157, C. jimbriatus is referred to as C. affinis, Fig. 
8, Plate VII. 
