SERTULARELLA POLYZONIAS. 235 



of its calycles is accompanied by a peculiar and character- 

 istic habit of growth. The physiognomy, indeed, of the 

 group is very striking, and the principal characters are 

 well marked. The calycles have always a toothed orifice, 

 and are closed by a somewhat prominent operculum 

 composed of several convergent pieces. The reproductive 

 capsules, whilst exhibiting many varieties of form, are 

 always more or less wrinkled or ringed transversely ; they 

 have usually a denticulate aperture. The male and female 

 only differ in size and in the nature of their contents. 



The type species (S. polyzonias} seems to be very 

 generally distributed. Two or three of our British forms 

 range to the extreme north, and S. tricuspidata may be 

 said to have its metropolis there. In the same region 

 a remarkable variety of S. polyzonias occurs, of a very 

 robust habit and having its calycles more than double the 

 usual size. I have specimens from Iceland; and Sars has 

 obtained it near the North Cape. He also states that he 

 has received the same variety from Massachusetts, U.S. 



The genus is represented in the South Seas by a 

 number of forms distinct from those of Europe. One of 

 them (the S. Johnstoni, Gray) makes a near approach to 

 our S. tricuspidata. 



1. S. POLYZONIAS, Linn. 



" GREAT TOOTH CORALLINE," Ellis, Corall.5, pi. ii. figs. A, b B, and pi. xxxviii. 



figs. 1 & A. 



SERTULARIA POLYZONIAS, Linn. Syst. x. 813 ; Esper, Pflanzenthiere, Sert. t. yi. 

 figs. 1-6; Lamk. An. s. Vert. ('2nd ed.) ii. 142; Lama:. Cor. 

 flex. 190; Johnsf. B. Z. 61, pi. x. figs. 1 & 3; Ddyctt, Kern. 

 An. i. 134, pi. xxii. 



FLEXUOSA, Linn. Syst. x. 814, no. 34. 



ERICOIDES, Pall. Elench. 127. 



PINNATA, Templeton, Mag. N. H. ix. 468. 



HIBERMCA, Johnsf. B.Z. (1st ed.) 128. 



., ELLISII, M.-Edwarch, Lam. An. s.Vert, (2nd ed.) ii. 142; Johmt. 



B.Z. (1st ed.) 123. 



