94 CLASS II. 



Flustra L. Polypary of aggregate cells, membranaceous, fron- 

 descent, lobate or expanded into a crust, celluliferous on one or 

 both sides. The cells are often aculeate on the anterior margin, 

 their opening transverse, semicircular, or lunate. 



Sea-Crust. Sp. Flustra foliacea L., Eschara foliacea PALL., DE JUSSIEU 

 M6m. de FA cad. royale des Sc. AnneV 1742. PL ix. fig. 3 ; ELL. Coratt. PI. 

 xxix. fig. a, A, B, C, E ; Cuv. R. Ani. 6dit. ill. PI. LXXVIII. fig. i ; JOHN- 

 STON, Hist. Br. Zooph. pp. 342, 343. PL LXII. fig. i, 2 ; Flustra cornuta 

 MILNE EDW., Cuv. R. Ani. edit. ill. PL LXXVIII. 1. L fig. 2, &c. 



Eucratea LAMOUR., (in part). MILNE EDW. Ann. des Sc. nat., 2e 

 Serie, ix. Zoolog. pag. 204, PL vm. 



B.) Cell (the posterior harder part of the animal) without oper- 

 culum; a setose collar or a crown of seta3 in the anterior part of the 

 body in many, or a muscular ring in others, in place of operculum. 



Tendra NORDM. 



Sp. Tendra zostericola, Cdlepora pontica EICHW. 



Tubulipora. Polypary calcareous made up of crowded tubular 

 cells, parasitic or incrusting. Aperture of the cells orbicular. Ten- 

 tacles 12. 



Sp. Tubulipora verrucosa MILNE EDW., Tubulipora orbiculus LAM. (syno- 

 nymes excluded) ; Cuv. R. Ani. edit. ittustr., Zoophyt. PL LXX. &c. 



Comp. on this genus MILNE EDWARDS, Ann. des Sc. nat. ie Serie, vm. 

 Zoologie 1837. pp. 321 338. PL xxn xxiv. JOHNSTON, Hist. Br. Zooph. 

 pp. 265274. PL XLVI. fig. 3, 4. 



Subgen. Diastopora LAM. 



Cellularia PALL., Cellaria LAM. Polypary ramose, composed 

 of cells arranged in a single or double row or verticillate, tubular, 

 calcareous, with orbicular aperture. 



Sp. Cellularia ebumea, Crisia eburnea LAMOUB., Sertularia cburnea L., ELL. 

 Corall. xxi. fig. a, A ; Cuv. R. Ani. edit. HI. Zoophyt. PL LXXIII. fig. 2 ; 

 VAN BENEDEN, Nouv. Mem. de FAcad. de Brux. xvm. PL m. fig. 12 

 1 6, &c. 



Comp. MILNE EDWARDS, Mem. sur les Crisies, les Horneres et plusieurs 

 autres polypes vivans ou fossiles dont ^organisation est analogue a celle des 

 Tubulipores, Ann. des Sc. nat. ie Serie, Zoolog. Tom. ix. 1838. pp. 193 

 238, PL vi xvi ; VAN BENEDEN, Recherches sur les Bryozoaires, Nouv. 

 Mem. de VAcad. de Brux. Tom. xvm. 1845. PP- IX 2 9- 



On the Polypary of this and some other genera shear-like organs 

 are seen that have some resemblance to a bird's head ; they have joints 



