280 PLTJMULARIID^. 



1. A. ANTENNINA, Linnaeus. 



"LOBSTER'S-EIORN CORALLINE Or SEA-BEARD," Ellis, Corall. 15, pi. ix. figS. U, 



A, B. 



SERTULARIA ANTENNINA. Linn. Syst. 1310; Pallas, Elench. 146; Esper, 



Pflanz. Sert. t. xxiii. figs. 1-4. 

 NIGELLASTRUM ANTENNiNUM, Oken, Lelirb. Nat. 93. 

 NEMERTESIA ANTENNINA, Lamx. Cor. flex. 163. 

 ANTENNULARIA INDIVISA, Lamk. An. s. Vert. (2nd ed.) ii. 156. 

 ANTENNINA, Johnst. B. Z. 86, pi. xix. figs. 1, 3. 



Plate LXI. 



STEMS clustered, simple or slightly branched, elongate, erect, 

 filiform, and springing from a sponge-like mass of inter- 

 lacing fibres ; BRANCHLETS short, incurved, swollen at the 

 base a whorl on each articulation of the stem divided 

 by oblique joints into internodes, which are alternately 

 larger and smaller, the former bearing the calycles ; HY- 

 DROTHEOE small, campanulate, distant, with an even rim, 

 always separated by two joints ; NEMATOPHORES conical 

 cup-shaped, a pair almost immediately above each caly- 

 cle, and one below it one on the small intervening in- 

 ternode, and two (one on each side) at the base of the 

 branchlet ; GONOTHEC^E produced singly in the axils of the 

 branchlets, oval, subpedicellate, with a subterminal cir- 

 cular aperture, looking towards the main stem. 







THE long thread-like shoots of A. antennina grow in clus- 

 ters of as many as 40 or 50, and are inserted at the base 

 in a compact fibrous mass of considerable size, in which 

 fragments of shell, stones, &c. are usually imbedded. The 

 delicate chitinous threads or rootlets which compose this 

 curious appendage grow out in whorls from the lower 

 region of the stem, and represent the branchlets of the 

 iipper portion. 



This species attains a height of 8 or 10 inches, and is 



