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Quarterly Journal of Microscopical Science, Vol s2-67, 85-100, Copyright © 1923 by Company of Biologists

Memoirs: On the Strobilization of Aurelia

E. PERCIVAL B.Sc.1

1 Department of Zoology, The University, Leeds

The manubrium of a primarily non-terminal ephyra is formed from the connecting tube between two ephyra rudiments.

The proboscis of the polyp remaining arises in a manner similar to that of the manubrium of the non-terminal ephyra.

The apical opening of an ephyra normally closes before liberation.

The connecting strands are covered with endoderm.

The longitudinal muscles of a polyp may be hollow and the cavities are not in communication with the peristomial pits.

The formation of the peristomial pit is associated with the development of the manubrium.

The gastral filaments are formed as paired outgrowths of the endoderm of the columella. They do not involve the longitudinal muscle in their production. They originate early in the history of an ephyra.

There are definite currents over the ectoderm caused by flagellated ectoderm cells.

The segments of a strobila may give rise to ephyrae or polyps and the oral disc may separate unchanged to continue its existence as a polyp.






© The Company of Biologists Ltd 1923