SERTULARIA. 127 



See Dr. Johuston's figure of Sertularia nigra, plate xii. 

 fig. 1, 2. 



7. Sertularia pinnata, Pallas. 



Hab. At the Lizard, Cornwall, Pallas ; Devonshire, Mrs. 

 Griffiths. I have it from Mr. Bean, Scarborough. 



Mrs. Griffiths mentions respecting this rare zoophyte that 

 when fresh it is entirely of a deep blood-red colour, and 

 when dried, brown. Pallas remarks that there is the closest 

 resemblance betwixt it and S. nigra; and Dr. Johnston 

 states that the real difference between them hes in the posi- 

 tion of the cells and in the form of the vesicles. The cells 

 arise, not from the sides exactly, but rather on the edge of 

 the pinnules ; the vesicles are comparatively small, obconi- 

 cal, with a series of tubercles or segments above, while the 

 centre projects in the shape of a cone or nipple. See Dr. 

 Johnston^s figure, plate xii. fig. 3, 4. 



8. Sertularia fusca, Robert Brown. 



Hab. Coast of Aberdeenshire, E. Brown; coast of North- 

 umberland, Mr. Embleton ; Scarborough, Mr. Bean ; Whit- 

 burn, county of Durham, Miss Daje; Stonehaven, Lady 

 Keith Murray. 



It is about three inches high, rigid, pinnate, dusky, 

 blackish-brown, varnished. The cells are arranged in a 



