102 THE STRUCTURE AND ECONOMY 



3. Acephalocystis armatus (Mihi). 



Parent sac opaque, membranes distinct, germinal membrane composed of a soft granular 

 matter, in which the germs are arranged irregularly ; they are globular and armed with an 

 irregular circlet of teeth at the part opposite that of attachment. 



ii. ASTOMA (MIHI). 



Not buried, but attached by means of a pedicle, which becomes very 

 slender as the animal increases in size. Young, globular and corru- 

 gated ; adult, botryoidal and smooth ; epithelial cells ; with some appear- 

 ance of tubuli in external coat. Young remain and increase in size 

 within the membranes of the parent, till she bursts, when they become 

 attached to the peritoneum. 



4. Astoma acephalocystis (Mihi). 



Botryoidal, that part of the interior not occupied with the young, filled with a yellowish 

 gelatinoiis matter. 



III. DI3KOSTOMA (MIHl). 



Peduncular. Whole group covered by a disk bearing tubular 

 membrane. 



5. DisJcostoma acephalocystis (Mihi). 

 Globular interior filled with gelatinous matter, of a transparent greenish yellow colour. 



IV. SPHAIKIDION (MIHI.) 



S. Animal enclosed within a cyst which is composed of two mem- 

 branes. Sac single, containing the pedicle or reproductive body in its 

 centre, and presenting a number of concentric coloured rings. Hab. 

 Peritoneum of Crested Balearic Crane. 



