118 GEOL. AND NAT. HEST. SURVEY OF MINNESOTA. 



which were both beyonsd 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 G. phaleratus was referred 

 to G. fimhriaius and the error then repeated in the making up of the 

 description of plates; second, in the Final Eeport, Plate 24, in Fig. 15 

 the printer has set G. adolescens one line too soon, making the figure 

 of the receptaculum of G. parous 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 

 G. adolescens, more beyond. 



The original description of Gyclops affinis Sars is here repeated, and 

 it justifies the doubt which, in the absence of authentic specimens or 

 figures, was felt respecting its position. 



" Antecedent! [C. phalerato] simillimus. Corpus autem minus robustum colore 

 coeruleo vel potius glauco sat saturate 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 triple longiore 

 longitudinemque abdominis superante, in medio aculeata dein vero subtile ciliata. 

 Antennae 1-mi paris segment© 1-mo corporis multo breviores, tenues, articulis 11 com- 

 positae. Pedes 5-ti paris distincti, uniarticulati, setis 3, quarum interior ceteris multo 

 major et ciliata, instracti. Sacci oviferi parvi abdomini appressi. Longit. circit. 

 f mm." 



From G. 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 

 anteunal joints and the form of this organ in the male. 



The formula for the length of the antennal joints in G. affinis is 



_^^ _:i^ — , while that of G. jjhaleratus is —^ — ^^ — ^^ 



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 G. 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, Fig. 12. 

 Sars '63; Rehberg '80 (diapbanus); Herrick '84 and '87 (diapbanus); Daday '85^ 

 (diaphanus); Lande '88 (diapbanus); Richard '91 (diapbanus); Schmeil '91; 

 Marsh '92. 



Description of the Female : The body, not including the cau- 

 dal setee, measures from 0.65 to 0.80 mm. The following are measure- 



tVery curiously in Schmeil's reference to figures, p. 157, C. fimbrialns is referred to as C. affinis, Fig, 

 8, Plate VII. 



