568 
Wisconsin Academy of Sciences, Arts, and Letters. 
notom mata collaris Ehrenberg 
Plate XLIV, figures 1-5 
Notommata collaris Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831) 
1832: 131, PL 4, fig. 11; ibid, (for 1833) 1834: 333, PL 9, fig. 2; 
Infusionsth. (1838), p. 428, PL 52, fig. 1.— Leydig, Zeitschr. Wiss. 
Zool. 6 (1854): 38.— ? Hudson and Gosse, Rotifera (1886): 2: 27, 
PI. 17, fig. 6.— Wierzejski, Rozpr. Akad. Umiej., Wydz. Mat.-Przyr. 
Krakow II, 6. (1893): 228.— Biufinger, Jahresh. Ver. Naturk. Wiirt- 
temberg 50 (1894): 43.— Levander, Acta Soc. Fauna et Flora Fen- 
nica, 12 3 (1895): 30.— de Beauchamp, Arch. Zool. Exp. IV, 10 
(1909): 157.— Lie-Pettersen, Bergens Mus. Aarbog (for 1909) 
1010 ir> : 41.— Weber and Montet, Cat. Invert. Suisse, fasc. 11 (1918): 
108. 
Copeus collaris Voigt, Siisswasserfauna Deutschlands, pt. 14 (1912): 
93, figs. 167, 168. 
The body of this species is fusiform, short, stout, and gibbous 
posteriorly; its greatest width is more than one third of the to¬ 
tal length. The integument is leathery and the outline fairly 
constant. It is a moderately transparent animal. 
The head segment is very small; its width is only one third 
of the greatest width of the body, and the length is still less. The 
neck is fairly long, about one seventh of the total length, and 
considerably enlarged posteriorly to provide room for the very 
large mastax. The anterior transverse folds are well marked. 
The abdomen increases to twice its anterior width at a point 
somewhat beyond mid-length; it is rounded posteriorly. The tail 
is short and very broad; it projects dorsally considerably above 
the foot and has only a single lobe. The foot has two very short, 
broad joints; on its dorsal side the terminal joint has a small 
knob-like papilla bearing a tuft of setae. The toes are very short, 
straight, conical, slightly blunted at the tips and with an indis¬ 
tinct enlargement at the base; their length is about one thirtieth 
of the total length. 
The dorsal and lateral antennae are small, setigerous conical 
elevation in the norma] positions. 
The corona extends down on the ventral side somewhat less 
than one fourth of the length of the body; the post-oral portion 
projects from the surface of the body as a fairly prominent chin. 
The auricles are moderately long and stout; the ciliation is con¬ 
tinuous with the corona. 
