270 SERTULARIID.E. 



(Sars): Southern Labrador, Caribou Island, in 8 fath., not 

 common (A. S. Packard, jun.): Nova Scotia (Dawson): 

 Grand Manan, common in 4-6 fathoms, attached to stones 

 (Stimpson): Massachusetts Bay (Agassiz): South Africa 

 (Busk).] 



7. S. CUPRESSINA, Linnaeus. 



" SEA-CYPRESS," Ellis, Corall. 7, pi. iii. figs, a, A. 



SERTULARIA CUPRESSINA, Linn. Syst. 1308 ; (in part) Pallas, Elench. 142 ; 



Lamk. An. s. V. (2nd ed.) ii. 144; Lamx. Cor. flex. 192 ; 



Johnst. B. Z. 80, pi. xvi. 

 DYNAMENA CUPRESSINA, Flem, Br. An. 543. 

 SERTULARIA ARGENTEA, Dalyell, An. Scotl. i. 189, pi. xxxvii. 



Plate LVII. 



SHOOTS long and slender, tapering off very gradually towards 

 the apex, which is much produced ; STEMS stout and 

 straight, branched ; branches alternate, fan-shaped, nar- 

 row, rather distant, somewhat spirally arranged, dicho- 

 tomously divided, the pinnules long and few in number ; 

 HYDROTHEC^E subalternate, tubular, pellucid, adherent 

 through most of their length, and scarcely divergent 

 above, aperture wide, bilabiate, rising into a point on 

 each side; GONOTHEC.E elongate, tapering below, with 

 a sharp spine above at each side, or sometimes at 

 one only, and a central aperture slightly raised and 

 margin ate. 



THE difference in habit between this and the preceding 

 species is so strongly marked, that each of them may be 

 recognized at a glance. Pallas, indeed, regarded them as 

 identical, but he seems to have formed a very imperfect 

 conception of the sum total of the distinctive characters. 

 Dr. Johnston confesses himself doubtful ; but Ellis seized 

 the main points of difference with characteristic quickness, 

 and saw their true value. His name for the present species, 



