197 



verse slit, and have a simple, semi-elliptical operculum, ending in a straight 

 proximal margin. The stem-internodes have a small depressed cryptocyst with 

 one pore at the bottom; and excepting the partitions of the stolon the other in- 

 dividual forms have their inner cavity divided into a series of segments (gener- 

 ally four), separated by more or less sharp constrictions. The distal walls have 

 a single-pored rosette-plate. Ooecia and avicularia wanting. 



Chlidonia Cordieri Aud. 

 Eucratea Cordieri Audouin, Descript de I'Egypte, Hist. Natur., Tome 1, 



explic. sommaire d. Planches pag. 242, Polypes PI. XIll, fig. S^— Sg. 

 Eucratea Cordieri Waters, Annals Nat. Hist., ser. 5, Vol. Ill, 1879, pag. 116, 



PL XV, figs. 9, 10, 11. 

 Chlidonia Cordieri d'Orbigny, Paleontologie Franqaise, Terrain cretaces, 



Bryozoaires, 1850 — 52, pag. 40. 

 Cothurnicella dsedala, Wyw. Thomson, Nat. Hist. Rev., Vol. V, pag. 146. 

 — — Wyw. Thomson, Dublin Univ., Zool. Bot. Assoc, 



1859, pag. 85. 

 Chlidonia Cordieri Busk, Challenger, Zoology, Vol. X, 1884, pag. 8, 



PI. XXVIII, fig. 11. 



— — Hincks, Annals Nat. Hist., ser. 5, Vol. XVII, pag. 258. 



— dsedala Mc Coy, Zoologie of Victoria, dec. XI, pag. 35, 



PI. CVIII, fig. 2. 

 — - — Mc Gillivray, Catalogue of the Marine Polyzoa of Vic- 



toria, pag. 10. 

 Chlidonia Cordieri Waters, Journal Linnean Soc, Zoology, Vol. XXVI, 

 1896, pag. 18, PL 1, fig. 8—9. 



— — Calvet, Bryozoaires Marins de la Region de Cette, 



pag. 13, PL I, fig. 1 et 2. 

 (PL Vffl, fig. 6 a— 6 y). 



As our knowledge of this often examined species still leaves a great deal to 

 be desired, I may here give a connected description of it. It occurs as compound 

 colonies, a number of small colonies springing from a reticularly branched, fili- 

 form stolon (fig. 6 i), which may cover various substances. This stolonate net- 

 work is composed of rather long partitions, separated two and two by a single- 

 pored rosette-plate (fig. 6 e), which is surrounded by a thickened, diaphragmatic, 

 projecting part of the inner wall. Each small colony (6 a, 6 b) is furnished with 

 a jointed stem, bearing two main branches likewise jointed, each of which termin- 

 ates in from 4 to 6 long cylindrical internodes. From each internode of the 



