G. SERTULARIA. 83 



pointed lateral appendages ; colour, a reddish green ; 

 height, from one to two decimetres. — Plate 5. fig. 3. a. 

 B. C. 



Australasia ; also on the English coast, as well as 

 the Pectinata. 



Nota. This Sertularia is ren^arkable for its elegance. 



CLIMBING. 



8. Sertv LARi A scaride?is. Principal stem filiform, 

 with very few cells, and climbing upon Gorgonias or 

 other marine productions ; secondary stems numerous, 

 simple, dispersed, and pinnated ; cells with a toothed 

 border ; ovaria oval, truncated, and bicornous ; colour 

 inclining to rose ; height from two to four centimetres. 



Australasia. 



ZONED. 



9. Sertularia polyzonias. Cells oval ; border 

 with four slightly projecting teeth; ovaria inclining 

 to oval, marked with transverse zones. 



European seas. 



RIGID. 



10. Sertularia rigida. Dichotomous ; branches 

 diverging and fragile ; cells distant, rather large, and 

 conical ; opening oval, with a point on the external 

 border; colour greenish grey; size from three to four 

 centimetres. 



Australasia. 



distant. 



11. Sertularia distans. Stem slightly ramified; 

 cells campanulated, very distant from each other, 

 and gibbous ; opening contracted and toothed ; 

 height from one to two centimetres. 



Australasia. 



