482 Wisconsin Academy of Sciences, Arts, and Letters, 
CEPHALODELLA HOODII (Qosse). 
Plate XXVIII, jSgure 1. 
? Plagiognatlia lacinulata Dujardin, Hist. Nat. Zooph., Inf., 1841, pi. 18, 
fig. 6; not Forticella lacinulata Muller. 
Diaschi^a lioodii Gosse, in Hudson and Gosse, Eotifera, 1886, vol. 2, p. 79, 
pi. 22, fig. 15.— Dixon-Nuttall and Preeman, Journ. Eoyal Mier. Soc., 
1903, p. 129, pi. 2, fig. 5.— Sachse, Siisswasserfauna Deutschlands, pt. 14, 
1912, p. 120, figs. 231-232.— Jakubski, Eozpr. Wiad. Muz. Dzieduszyckicli, 
vol. 1, No. 3-4, 1915, p. 21.— Weber and Montet, Cat. Invert. Suisse, pt. 
11, 1918, p. 139. 
DiaschiBa rJiamphigera Gosse, Journ. Eoyal Micr. Soc., 1887, p. 6, pi. 2, 
fig. 20.— Hudson and Gosse, Eotifera, Suppl., 1889, p. 38, pi. 31, fig. 32. 
Plagiognatlia gracilis Tessin, Arch. Naturg. Mecklenburg, vol. 43, 1890, p. 
150, pi. 1, fig. 10. 
Diaschiza valga Bilpinger, Jahresh. Ver. Naturk. Wurrtemberg, vol. 50, 
1894, p. 53.— Weber, Eev. Suisse Zook, vol. 5, 1898, p. 549, pi. 20, figs. 
26-28.— Lie-Pettersen, Bergens Mus. Aarbog (for 1909), 1910, No. 15, 
p. 58.— Mola, Ann. Biol. Lac., vol. 6, 1913, p. 256. 
The body is fairly slender and somewhat gibbous dorsally. The 
head is fairly large, oblique anteriorly and slightly deflexed. The 
neck is well marked. The abdomen is unusually elongate and the 
dorsal line arched and rounded posteriorly; its greatest depth is 
at mid-length; the lorica is firm and the plates well marked. The 
lateral clefts are narrow and parallel-sided in the anterior half of 
their length and widen gradually towards the posterior end. The 
foot is rather small and conical; the tail is fairly prominent and 
near mid-length. The toes are rather short, fairly stout and de- 
curved, tapering gradually to acute points; their length is a little 
less than one fourth of the total length. The foot glands are rather 
small and pyriform. 
The corona is moderately oblique and strongly convex with 
prominent, beaklike lips. 
The mastax is fairly large and of the normal type; the fulcrum is 
very slightly expanded posteriorly, the manubria short, very slen¬ 
der, rodlike and slightly recurved at the ends, but' not crutched. 
The gastric glands are small and ovate. 
The ganglion is very large and saccate; the eyespot is fairly large 
and at the posterior end of the ganglion. The retrocerebral organ 
is absent. 
Total length 140~145/x; toes 32-35/x. 
Cephalodella hoodii is not common; we have collected it at Madi¬ 
son, Wisconsin, in Fairmount Park, Philadelphia, Pennsylvania, 
and near Los Angeles, California. 
