Zooecia sentence example
- - Zooecia prismatic or cylindrical, with terminal, typically circular orifice, not protected by any special organ.
- The ovicells are modified zooecia, and contain numerous embryos which in the cases so far investigated arise by fission of a primary embryo developed from an egg.
- - Zooecia with soft uncalci fled' walls, the external part of the introvert being closed during retraction by a membranous collar.
- Zooecia either arising from a stolon, without lateral connexion with one another, or laterally united to form sheets.
- - Part of a branch of Bowerbankia pustulosa, showing the thread-like stolon from which arise young and mature zooecia.Advertisement
- - Zooecia of Umbonula pavonella, showing a pair of minute avicularia on either side of the orifice of each zooecium.
- The alternate increase and diminution of volume is easily understood in forms with flexible zooecia.
- As indications that the conditions described in Membranipora and Cribrilina are of special significance may be noted the fact that the ancestrula of many genera which have well-developed compensation-sacs in the rest of their zooecia is a Membranipora-like individual with a series of marginal calcareous spines, and the further fact that a considerable proportion of the Cretaceous Cheilostomes belong either to the Membraniporidae or to the Cribrilinidae.
- In the majority of Cheilostomes, the avicularia are, so to speak, forced out of the ordinary series of zooecia, with which they are rigidly connected.
- But avicularia or vibracula may also occur in other places - on the backs of unilaminar erect forms, along the sutural lines of the zooecia and on their frontal surface.Advertisement
- In the Cyclostomata, further distinguished by the cylindrical or prismatic form of their highly calcified zooecia, the orifice is typically circular, without any definite closing organ.
- - Zooecia, long and coherent, prismatic or cylindrical, with terminal orifices, their wall thin and simple in structure proximally, thickened and complicated distally.
- Orifices of the zooecia often separated by pores (mesopores).
- The ovicells commonly found as globular swellings surmounting the orifices are not direct modifications of zooecia, and each typically contains a single egg or embryo.