106 NATURAL HISTORY OF 



and are often three or four times tlie length of the 

 polyp." — Hlncks. 



FAMILY VIII. SERTULAMD^. 



Calyclcs ijerfedly sessile, mere or less inserted in the 

 stem and branches. Polypites wholly retractile, with a 

 single ivreath of filiform tentacles round, a conical pro- 

 boscis. Gonozooids always fixed. — T. H. 



Genus I. Sertularella, Gray. (Dimin. of Sertularia.) 



Zoophyte plant-like. Stem more or less branching, 

 jointed, rooted by a creeping stolon. Calycles biserial, 

 alternate, with a toothed orifice and an operculum 

 composed of several pieces. Gonothecce scattered, 

 transversely ringed. — T. H. 



1. S. POLYZONiAS, Linn. Plate V. fig. 3. 



Sertularia flexuosa (Linn.), S. erecoides (Pal.), S. pin- 

 nata (Templeton), S. hibernica (G. J.), S. EUisii {M. 

 Edw., G. J., R. Q. C), S. polyzonias {E. and 8., Linn., 

 Esp., IjamJc., Lamx., Flem., G. J., Dal., D. L., R. Q. 0., 

 P.H. G., McA.), La Sertulaire Zonee [De B.), Cotulina 

 polyzonias {Ag.). 



Hab. : Generally distributed, on shells, seaweeds, 

 &c. Stem slender, straw-coloured, irregularly branched. 

 Calycles alternate and distant, urceolate. Aperture 

 wide, with 4 teeth. GonothecfB ovate, wrinkled, with 

 4 teeth at the orifice. Polypite with about 20 tentacles. 



This is the "Great Tooth Coralhne'-' of Ellis 

 {" Corallines," 5), who says, respecting it, "There are 

 two kinds of this coralline, the one upright, the other 

 more branched and climbing-. When this coralline 

 was put into sea water, I observed through the micro- 

 scope a polyp occupy the inside of the whole, and 



