544 ZOOPHYTA. SERTULAMADjE. Dynamena. 



subdivided and panicled ; cells subcylindrical, obliquely trun- 

 cated, and rather close to the stem. 



Sea cypress, Ellis, Cor. 7 — Sertularia cup. Linn. Syst. i. 1308. Pall. 

 El. 141. Lamour. Cor. Flex. 192 — Common on oyster-beds. 



Height upwards of a foot ; subordinate branches twice or thrice divided ; 

 the cells are short, subopposite ; the vesicles are narrow at the base, ovate, 

 truncated, with a subtubular orifice, and a wing-like pointed process at each 

 side. 



171. D. argentea. — Stem with alternate branches, which are 

 subdivided and panicled ; cells conical, diverging, pointed. 



Squirrel's tail, Ellis, Cor. 6. t. ii. f. 4. — Sertularia cupressina, var. arg. 

 Linn. Syst. i. 1308. Pall. El. 141 — Sert. arg. Lamour. Cor. Flex. 192. 

 — Common on oyster-beds. 



Height upwards of a foot ; branches sometimes thin and bifarious, or close 

 and panicled; cells subopposite, diverging; vesicles oval; nearly related to 

 the preceding, of which, by many, it is supposed to be a variety. 



172. D. opcrcidata. — Dichotomously branched, divisions dis- 

 tant ; cells opposite, inversely conical, truncated. 



Sea-hair, Ellis, Cor. 8. t. iii. f. 6 Sertularia op. Linn. Syst. i. 1307. — S. 



usneoides, Pall. El. 152. — Dynamena op. Lamour. Cor. Flex. 176. — 

 Common about low water-mark, on fuci. 



Height two or three inches; growth usually in tufts; cells pointed exter- 

 nally ; vesicles ovate, narrow at the base, rounded at the summit, with a short 

 tubular operculated centre. 



173. D. pumila. — Irregularly branched bifariously ; cells op- 

 posite, subcylindrical, diverging and free towards the aperture, 

 which is blunt and emarginate. 



Sea oak coralline, Ellis, Cor. J. t. v. f. 8. — Sertularia pum. Linn. Syst. i. 



1306- Pall. El. 130 Dynamena pum. Lamour. Cor. Flex. 179."— On 



Fucus serratus, common. 



Height about an inch ; growth tufted ; each cell seems jointed towards the 

 base; vesicles subglobular, with a narrow foot-stalk, and a slightly contracted 

 truncated summit. 



174. D. rosacea. — Thinly branched bifariously ; cells oppo- 

 site, cylindrical, and spreading. 



Lily coralline, Ellis, Cor. 8. t. iv. f. 8 — Sertularia ros. Linn. Syst. i. 130C. 

 S. nigellastrum, Pall. El. 129 — Dynamena ros. Lamour. Cor. Flex. 178. 

 On old shells beyond low water-mark. 



Height two or three inches ; branches few ; cells, where united with the 

 stem, becoming tubular and narrow, suddenly diverging nearly at right 

 angles, and slightly truncated at the extremity ; the vesicles are subcylindri- 

 cal, slightly enlarged at the summit, with several spinous processes. 



175. T>.Jilicula. — Dichotomously branched, with a cell in the 

 angle; branches short; cells opposite, oval, diverging, with a 

 tubular orifice. 



Sertularia fil. Sol. Ellis, Zooph. 57. t. vi. f. c. Lamour. Cor. Flex. 188 — 

 On the stems of fuci, about low water-mark; not common. 

 Height about an inch ; branches alternate ; cells wide at the base, contract- 

 ed towards the orifice, which is slightly tubular, with a wrinkle or depression 



