646 Wisconsin Academy of Sciences, Arts , and Letters. 
nearly into a semicircle, is imbedded in the walls of the mastax 
on each side, immediately under the upper ends of the manubria, 
the dorsal ends meeting in the median plane, approximately at 
the level of the anterior end of the fulcrum; these rods serve for 
the support of the mastax during the pumping operation. Two 
ventral salivary glands are present; the left gland is small, while 
the right is extremely large and curves under the fulcrum. 
The oesophagus is slender and of normal length. The gastric 
glands are large and ovate. Stomach and intestine are not dis¬ 
tinctly separated. The ovary is rather small and irregularly ovate 
in outline. A rather small bladder is present. The foot glands are 
ovate and unusually large; they terminate in a large mucus re¬ 
servoir, which is partly in the basal portion of the toe. 
The ganglion is moderately large and saccate. The retrocere- 
bral organ is limited to a long, fairly large sac, so crowded with 
bacteroids as to be completely opaque. No eye-spot is present. 
Total length 225-275/u.; toes 28/a, reduced portion 22/u,; trophi 
38/a. 
Eosphora melandocus is widely distributed, but usually in 
small numbers. Bilfinger states that it lives chiefly on Bdel- 
loids, and it is unusual to find a , specimen that has not at least 
one pair of the characteristic trophi in its stomach. 
This species is readily recognizable by the peculiar toes, as 
well as by the opaque sac and the general outline of the body. 
Eothinia Harring and Myers, new genus 
eothinia elongata (Ehrenberg) 
Plate LXI, figures 1-5 
Eosphora elongata Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831) 
1832: 140; Infusionsth. (1838), p. 452, PI. 56, fig. 9.— Eckstein, 
Zeitschr. Wiss. Zool. 39 (1883): 366, PI. 25, fig. 30.— Plate, Jen- 
aische Zeitschr. Naturw. 19 (1886): 28.— -Hudson and Gosse, Roti- 
fera, Suppl. (1889), p. 27, PI. 33, fig. 8.— Wierzejski, Rozpr. Akad. 
Umiej. Wydz. Mat.-Przyr. Krakow, II, 6 (1893): 231, PI. 5, fig. 38. 
—Hood, Proc. Royal Irish Acad. Ill, 3 (1895): 683, PI. 21, fig. 3.— 
Voigt, Siisswasserfauna Deutschlands, pt. 14 (1912): 115, fig. 221. 
Weber and Montet, Cat. Invert. iSuisse, fasc. 11 (1918): 122. 
Notommata elongata Bartsch, Jahresh. Naturk. Wiirttemberg 26 
(1870): 339. 
Eosphora striata Glasscott, Proc. Royal Dublin Soc. n. ser. 8 (1893): 
57, PI. 4, fig. 5. 
