The eyes are feebly developed (fig. 55) and some specimen are lacking them. p. 39
It is conical, its base is cut off obliquely.The opening is terminal. Beklemischev 1951 Seite 39.
The proximal end has toothelike notches. Beklemischev 1951 Seite 33.
The basal edge of the funnel usually has longitudinal creases. p. 35