The oscula are large and ragged on the edges; the shape is irregular.
oscula numerous but minute and inconspicuous, never star-shaped.
The oscula are small; some of them are raised above the general surface but not on regular turret-shaped eminences.
Generally cup-shaped; oscula on inner side of cup or on upper flat surface; very soft and elastic.
Their oscula were not raised on conical eminences and were altogether most inconspicuous.
The water from outside therefore flows in at the pores and finally makes its way out of the oscula.
Dermal membrane in close contact with the skeleton; pores and oscula inconspicuous.
The external membrane in many Spongillid is prolonged round and above the oscula so as to form an oscular collar.
oscula circular or star-shaped, usually surrounded by radiating furrows; pores normally contained in single cells.
External membrane closely adherent to the sponge except immediately round the oscula.
osculum os·cu·lum (ŏs'kyə-ləm)
n. pl. os·cu·la (-lə)
A pore or minute opening.