The dorsal bristles lie on the right border of the wide rows and to the left of the narrow rows.ģ. Between each dorsal "kinety" are two rows of alternating wider and narrower polygons, revealed by silver impregnation techniques. Nine latero-dorsal rows of bristles, corresponding in position to the dorsal ridges (the left one distinctly ventral). Eighteen cirri: six frontals three ventrals, five anals and four caudals, two of the latter on the right side tending to be fimbriated. The latter delimit the endoplasmic sac on the right. Between this bulge and the elongated triangular peristomal plate on the left anterior side of the buccal cavity is a trough or channel expanded anteriorly as well as posteriorly in the region of the paroral membraelles. Right edge of the peristome an almost straight wall originating as an extension of the ventral ridge at the left of the anal cirri undercut so as to form a narrow lip, anterior to the paroral membranelles attached to it and the dorsal wall of the buccal cavity is a low bulge partly occluding the cavity.
Adoral membranelles approximately 40, arranged in a smooth curve terminating on the right edge of the collar. Buccal cavity (peristome) extending slightly beyond middle of body. Body flattened, oval in face view right anterior margin straighter than the more convex shoulder on the left side posterior end bluntly pointed. patella, differing from it in shape and size, in the possession of zoochlorellae and possibly in the structure of the peristome.Ģ. It is a fresh-water form found in Philadelphia, Pa., and appears to be closely related to E. is described as a hitherto unrecognized species.
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