BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 5 



Cribiumorphs: Cells with costulated frontals. 



Cryptocyst: Calcareous lamella bordering the mural rim and serving as a 



frontal to cells deprived of a compensatrix. Between it and the ecto- 



cyst there is a cavity or hypostege operating as a hydrostatic apparatus. 

 Dietellae : Small chambers placed around the cells. 



Distal,: Portion of an image (or of an organ) most distant from the observer. 

 Ectocyst: Thin membrane entirely surrounding the colony. 

 Endocyst : Thin inner membrane containing all the organs located in the cell. 

 Endozooecial (or Entozooecial) : Cavity (ovicelled) located in the interior 



of the cell. 

 Eschara : Name applied to a free colony formed of two erect lamellae, back 



to back. 

 Genesies: Cells containing only female organs; they are often deprived of 



polypides. When they are ovicelled, the ovicell is endozooecial. 

 Gymnocyst : Inferior calcified portion of certain Membranipores. 

 Heterozooecia : Small cells without polypide, or different forms of normal 



cells. 

 Hyperstomial : Placed above the aperture, referring to a form of ovicell. 

 Hypostege : Cavity situated between the cryptocyst and the ectocyst. 

 Lacunae: Small pores between the costules of the cribrimorph cells. 

 Lumen : Clear longitudinal line in the middle of the costules of cribrimorph 



cells. 

 Mandible : Small chitinous organ, triangular or rounded, attached to the avic- 



ularia. It always moves in the same direction. 

 Oectopore: Orifice of the ovicell of tubular Bryozoa (Cyclostomata). It is 



surrounded by an oeciostome more or less salient. 

 Olocyst: Calcified frontal of a cell provided with a compensatrix. It is 



always thin and smooth. 

 Onychocellarium : An avicularium in which the mandible is provided with 



lamellar expansions. 

 Operculum and Opercular Valve: Small chitinous organ closing the orifice of 



the cells. 

 Opesiules and Opesiular Indentations : Small perforations in the cryptocyst 



for the passage of the muscles attached to the ectocyst. 

 Opesium : Large orifice left on the Membranipore cells after the disappearance 



of the chitinous ectocyst. 

 Oral: Any organ (spines, avicularia, mucron, etc.) placed in the neighborhood 



of the aperture. 

 Orifice : Aperture of the tubular cells. 

 Ovicell: Chamber of incubation for the embryo until its metamorphosis into 



a free larva. It is formed of two lamellae, the ectoecium and entoecium. 

 Pericyst : Calcified frontal in certain families never covered by the membranous 



ectocyst. 

 Peripores : Pores of the frontal surrounded by a salient circle. 

 Peristome : Salient calcification around the aperture or a pore. Its orifice is the 



peristomice ; the exterior free portion is the peristomie. 

 Pleurocyst : Calcareous pellicle generally granular, placed on the olocystal 



frontal of a cell surrounded by areolar pores. 

 Polypide: Animal with tentacles placed in the interior of the cell and of the 



tubes. It has a mouth, a stomach, an intestine, and an anus. 

 Poster: Anterior proximal portion of the apertura. 



Protoecium: Small initial disk of the ancestrula of a tubular colony (Cyclo- 

 stomata). 



