Zoarium incrusting, with a tendency to grow in bands: the general surface stands high and shows no trace of zoœcial boundaries; it is much rumpled, apparently unsysteniatically, but is only broken by the zoœcial peristomes; these are short tubular prominences inclined slightly forwards but bent upwards at the ends so as to end in a plane parallel with the general surface: the apertures are on the whole circular, but very rarely truly so, and occasionally very irregular; they vary in internal diameter from -08 in a small specimen such as Fig. 2 up to -15mm. in a large specimen such as Fig. 3; the peristomes are thick and each has from one to four pores in it; these pores are generally small and round, but occasionally among the larger ones are found definite instances of arrowhead shape which makes it possible that all are avicularian: round the edges of the zoarium there is a fairly complete fringe of simple shallow Membraniporiform zoœcia, with the general surface either ending abruptly above them or sloping gradually down to them.