vine: polyzoa of the wenlock shales. 
183 
I have included in the above description of this Sub-order the 
reference to the " closure" of certain cells which cannot, however, be 
characterised as an operculum in the sense generally applied by 
wTiters on Polyzoa. 
Family 1. — Stomatoporid.e, Vine. 
Report Brit. Assoc on Fossil Polyzoa, 1883. 
Zoarium entirely adherent, simple or branched. Zo?ecia arranged 
in a single series, or in several, which take a linear direction generally. 
Genus I. — Ascodictyon, Nicholson and Etheridge, Jun. 
„ II. — Rhopalonaria, Ulrich. 
„ III. — Stomatopora, Bronn. 
Sub-genus Proboscina. 
Genus I. — Ascodictyon, Nich. & Etheridge, Jun. 
Ascodictyon Annals and Mag., Nat. Hist.,Ser. 4, vol. xix., pp. 463-468, 
pi. xix. 
Ascodictyon, Vine. Notes on Polyzoa of the Wenlock Shales, Quart. 
Journ., Geol. Soc, Feb. 1882. 
Ascodictyon, Vine. Notes on species of Ascodictyon, and Rhopalonaria, 
Annals Mag., Nat. Hist., Aug., 1884. 
Ascodictyon, Vine. Brit. Assoc. Report, Fossil Polyzoa, 1883. 
Generic Characters. Organism composite, adherent : composed of 
calcareous cells or vesicles, the walls of which are perforated by 
microscopical foramina, but which possess no single large aperture. 
The cells united by short tubular necks or disposed in clusters and 
connected with one another by hollow filamentous threads, which 
usually anastomose, and which in some cases at any rate, are likewise 
perforated by microscopic pores. 
1. Ascodictyon filiforme Vine. Plate XIL, tigs. 1 to 4. 
A. tiliforme, Ann. Mag. Nat. Hist., pp. 78-80 fig. 1. 
A. filiforme. Vine, Quart. Jour. Geol. Soc. Feb. 1882. 
p. 54. 
Habitat: On broken shells and stems of crinoids. 
Localities. Buildwas beds, Wenlock shale : Shales above Wen- 
lock limestone, but rare. 
2. Ascodictyon radiciforme Vine. PI. XIL, figs. 5 and 7-10. 
