Earring & Myers—Botifer Fauna of Wisconsin — II. 483 
CEPHALODELLA PLICATA Myers, new species. 
Plate XXVIII, figures, 3-4. 
The body is rather short and strongly gibbous dorsally. The 
head is fairly large and somewhat deflexed. The neck is well 
marked. The abdomen is strongly arched dorsally, with its greatest 
depth near mid-length; the lorica is very firm and the plates well 
marked; posteriorly it projects over the foot nearly to the base of 
the toes. The dorsal and lateral clefts are abnormally deep and 
their edges project as very distinct ridges, as shown in the optical 
section of the body in figure 4; the dorsal cleft is straight-sided 
and acute-angled, the lateral clefts rounded at the bottom. Sym¬ 
biotic zoochlorellae are invariably present and arranged in a 
fairly regular and quite constant pattern. The foot is rather small; 
the minute tail is near the posterior end. The toes are rather short, 
fairly stout, tapering, and slightly deeurved; their length is about 
one fourth of the total length. The foot glands are rather small and 
pyriform. 
The corona is moderately oblique and convex without projecting 
lips. 
The mastax is fairly large and of the normal type; the fulcrum 
is very slightly expanded at the posterior end; the manubria are 
short, slender and without terminal crutch. No gastric glands 
are present. 
The ganglion is moderately elongate and saccate; no retrocere- 
bral organ is present. The eyespot is at the posterior end of the 
ganglion. 
Total length 105-110/a ; toes 24-27/a. 
Cephalodella plicata is not rare in soft, acid water ponds among 
Fontinalis and submerged sphagnum; we have collected it in Loon 
Lake, Vilas County, and Starvation Lake, Oneida County, Wis¬ 
consin, and also at Bargaintown, near Atlantic City, New Jersey. 
It has a superficial resemblance to C. hoodii and C. ventripes, but 
the projecting beak is absent; the exceptionally deep dorsal and 
lateral cleft's and the symbiotic zoochlorellae are sufficient to dis¬ 
tinguish it from these species. 
