j46 ZOOPHYTA. SERTULARIAD^. Plumularia, 



Gen.LXVI. ANTENNULARIA — Stem verticiilated, with 

 slender simple branches ; cells distant. 



181. A. antennina. — Stem erect, simple or alternately branch- 

 ed ; branches of the whorls slender, incurved. 



Corallina Astaci corniculorum semula, Raj/, Syn. Stirp. 34.— -Lobster's 

 horn Coralline, Ellis, Cor. 15. t. ix. — Sertularia an. Linn. Syst. i. 1310. 

 Pall. El. 146. — Ant. indivisa and ramosa, Lam. Hist. 2. 123 — Nemer- 

 tesia antennina and ramosa, Lamour. Cor. Flex. 163 — On oyster-beds, 

 common. 



Height upwards of a foot; stem either straight and simple, or slightly 

 branched, arising from a matted tubular root ; cells on the inside of the ver- 

 ticillate branches, distant, unequal, slightly campanulate ; vesicles at the up- 

 per base of the branches, pedunculated, ovate, with obliquely truncated 

 mouths. 



Gen. LXVII. PLUMULARIA.— Stems not verticiilated ; 

 cells sessile, uniformly distributed on one side of the branch. 



* Stem simple. 



182. P. pluma. — Stem pinnated ; cells cup-shaped, with a 

 denticulated margin. 



Podded Coralline, Ellis, Cor. 13. t. xii. f. 12 — Sertularia pluma, Linn. 



Syst. i. 1309. Pall. El. 149 Plumularia cristata, Lam. Hist. ii. 125. 



— Aglaophenia pluma, Lamour. Cor. Flex. 178 — On fuci, near low wa- 

 ter mark, rare. 

 Height about two inches ; frond lanceolate ; branches alternate, simple ; 

 cells with a wide mouth ; the vesicles are pedunculated, ovate, compressed, 

 slightly bent, with a mesial band above and below, and transverse muricated 

 ribs. 



183. P. pennatula. — Stem pinnated; cells cup-shaped, Avith a 

 denticulated margin, supported on the under side by a length- 

 ened incurved spinous process. 



Sertularia pen. Sol. Ellis, Cor. 56. t. vii. f. 1, 2 — P. pen. Lamark, Hist. ii. 



128 Aglaophenia pen. Lamour. Cor. Flex. 168. — Sert. pen. Flem. Edin. 



Phil. Journ. ii. 83 Shores of Devon, Mr Montagu. 



Height from about 3 to 6 inches ; stem of a brown colour, jointed ; branches 

 opposite, curved ; the cells are short and wide — The late Mr Montagu de- 

 tected this species on the shores of Devon, in 1808, and to whom I am in- 

 debted for a specimen. 



184. P. fitlcata.' — Stems waved, dichotomously divided ; pin- 

 nated by alternate branches ; cells subcylindrical, crowded. 



Sickle coralline, Ellis, Cor. 12. t. vii. f. 1 1. and t. 38. f. 5 — Sertularia falc. 

 Linn. Syst. i, 1309.— Pall. El. 144 — PI. Mc. Lamark, ii. 123 — Aglaophe- 

 nia fal. Lam. Cor. Flex. 174 — Very common on old shells, a little be- 

 yond low Avater mark. 

 Height nearly a foot ; weak, leaning ; cells closely connected along the side 

 of the branch, and divided by the joints into pectinated masses (thus ap- 

 proaching a Serialaria), the summits obliquely truncated; vesicles ovate, 



