6 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



Regeneration : A phenomenon particular to the Bryozoa. A dead polypide 

 in a cell is expelled in the form of a brown body and is replaced by another 

 polypide. The latter often produces a secondary calcification visible ex- 

 teriorly, which permits the recognition of this phenomenon in fossil species. 

 The polypide may be replaced by an avicularium. 



Rimule: Posterior small tongue observed often on the operculum. 



Sclebite: Marginal thickening of the operculum. 



Sinus : Proximal indentation in the aperture, corresponding to the rimule 

 of the operculum. It is the orifice of the compensatrix. The operculum 

 closes at the same time as the cell, the orifice of the tentacles, and that 

 of the compensatrix. 



Septulae : Very small perforations in the walls of the cells, serving for the 

 passage of the mesenchymatous fibers. They are uniporous or multiporous. 



Spicules: Small spines without internal canal. 



Spines : Small hollow projections more or less long. They are marginal when 

 placed around the cells and oral when around the aperture. 



Spiramen : Orifice opening into the peristomie above the operculum. 



Sulci: Longitudinal furrows decorating the Horneridae and some other tubu- 

 lar Bryozoa. 



Tentacles : Small ciliated arms serving in the nutrition of the polypide. They 

 do not capture the plankton, but they are cilia that by their synchronous 

 vibrations direct the water toward the mouth. 



Tremocyst: Perforated frontal of the cell. The perforations are the tremo- 

 pores. 



Vacuoles : Small perforations opening at the bottom of the sulci. 



Vibracularium : Small special cell without polypide. It contains the muscles 

 for the movement of the vibraculum. 



Vibraculum : A cilium of more or less length moving in every direction. 



Vinculaeian : Name applied to a colony with cylindrical growth form. 



Zoarium : Colony. 



Zooecium : Cell. 



ALPHABETICAL LIST OF VINCENTOWN LIMESAND BRYOZOA, SHOW- 

 ING GEOGRAPHIC DISTRIBUTION 



(V=Vincentown, N.J. ; T=Timber Creek and Mullica Hill, N.J. ; B=near 

 Blackwoodstown, N. J. ; N=Noxontov. n Millpond, Del.; 0=2 miles southwest 

 of Odessa, in branch of Oppoquinimink Creek, Del.) 



Cheilostomata 



Acanthionella typica Gabb and Horn, 1862 (V, T, B, N, O). 



Aeolopora grandis, new species (V, B). 



Alderina rustica D'Orbigny, 1852 (V, B, N, O). 



Alderina welleri, new species (V, N). 



Allantopora annuloidea Ulrich and Bassler, 1907 (V). 



Allantopora irregularis Gabb and Horn, 1S60 (V, T, B). 



AmpKiWestrumC!) abortivum Gabb and Horn, 1862 (V, T, B). 



Anornithopora(l) fragilis, new species (V). 



Aplotisina contumax, new species (V, B). 



Aplousina disjuncia Gabb and Horn, 1862 (V, B). 



Beisselina intermedia, new species (V). 



