70 ANTIIOZOA HYDROIDA. 



of the vesicles. The former arise not from the sides exactly, but 

 rather on the edge of the pinnules, (" in alterum stirpis latus ver- 

 gentes,") and this character is obvious enough with a good magnifier : 

 the latter are comparatively small, ob-conical, with a series of 

 tubercles or segments above, while the centre projects in the shape 

 of a cone or nipple open on the top. (Fig. 10, 6.) The cells are 

 semialternate, appressed, the upper portion scarcely everted, the 

 mouth wide with a plain rim usually sinuated next the side of the 

 rachis The description which Mr. Couch has given of the imma- 

 ture vesicle of S. nigra applies to the vesicle of this species. 



8. S. PUSCA, pinnate, llacJcish ; pinna filiform ; cells very 

 small, appressed, tubular, four-rowed; vesicles pearsliaped, 

 smooth. Robert Brown." 



WOODCUT, No. 6, ON PAGE 57 : AND FIG. 11. 



Sertularia nigra, Jameson in Wern. Mem. i. 565. Johns. Brit. Zooph. 128. Mac- 

 ffillivray in Ann. Nat. Hist, ix, 463. Dynamena nigra, Flem. Brit. Anim. 545. 



Hah. Coast of Aberdeenshire, R. Brown. Coast of Northum- 

 berland at Dunstanborough Castle, from deep water, E. Enibleton. 

 Scarborough, W. Bean. Whitburn, co. Durham, Miss M. Dale. 



* The author of the "Prodromus Florae Novae Hollandise." 



