Earring & Myers—Rotifer Fauna of Wisconsin — 11. 481 
and the margin cut into lappets or ‘ ‘ lacinulae ^ \ As auriculata is 
the oldest name, it will have to take the place of lacinulata; both 
are obviously misnomers. 
CEPHALODELLA EXIGUA (Gosse). 
Plate XXVIII, figure 2. 
DiascMsa exigua Gosse, in Hudson and Gosse, Eotifera, 1886, vol. 2, 
p. 78, pi. 22, fig. 15.— Dixon-Nuttall and Freeman, Journ. Eoyal 
Micr. Soc., 1903, p. 133, pi. 3, fig. 10.— Von Hofsten, Arkiv Zool., 
Stockholm, vol. 6, No. 1, 1909, p. 52.— Sachse, Siisswasserfauna Deutseh- 
lands, pt. 14, 1912, p. 121, figs. 233-234.— -Montet, Eev. Suisse Zool., vol. 
23, 1915, p. 330.— Jakubski, Eozpr, Wiad. Muz. Dzieduszyckieh, vol. 1, 
No. 3-4, 1915, p. 20.— ^Weber and Montet, Cat. Invert. Suisse, pt. 11, 
1918, p. 140. 
The body is rather short, stout and oblique anteriorly. The head 
is very large and deflexed. The neck is well marked. The abdomen 
is laterally compressed at the posterior end; the dorsal and ventral 
edges are almost parallel, the dorsal slightly arched; the lorica is 
flexible, but the plates are fairly distinct; the lateral clefts are wide 
and parallel-sided anteriorly, the posterior ends slightly flaring. 
The foot is very small, almost tubular, and gives the abdomen the 
appearance of being squarely truncate posteriorly; the tail is very 
small and not far from the end of the foot. The toes are short, slen¬ 
der, slightly decurved and taper gradually to acute points; their 
length is a little more than one fifth of the total length. The foot 
glands are small and pyriform. 
The corona is strongly oblique and distinctly convex without 
projecting lips. 
The mastax is large and of the normal type; the fulcrum is very 
slightly expanded at the posterior end; the manubria are very 
slender and strongly recurved posteriorly, but not crutched. The 
gastric glands are moderately large. 
The ganglion is very elongate and saccate; the retrocerebral organ 
is absent. The large eyespot is at the posterior end of the ganglion. 
Total length 90-95/x; toes 20-22/x, 
Cephalodella exigua is present in weedy ponds everywhere, usu¬ 
ally in large numbers. 
