the biological bulletin biology zoology biology marine biology 124 e a andrews in using the annulus as a sperm receptacle the male passes the sperm into the orifice and thence into the posterior part of the tube the anterior part of the organ the orifice itself and the following transverse part which may be called the vestibule is filled not with sperm but with a cement that protects the sperm from the water eventually the sperm issues out through the more posterior part of the suture at the right time to meet the eggs when the young c affinis hatches from the egg there is no rhpd47.jpg from içina sperm View Photo