Antennularia. 
Z. HYDRQIDA. 
189 
pellucid, the stem nearly equal in diameter throughout, compressed 
upwards, finely wrinkled when dry, divided by joints not regularly 
equidistant, naked on the lower half, pinnated above and celliferous : 
pinnae simple, patent, rather close-set, not exactly opposite nor yet 
properly alternate. Cells in a single series along each side, semial- 
ternate, ovato-tubular, short with a round plain aperture. Vesicles 
issuing from both sides of the pinnae, most numerously from the up- 
per, subpedicellate, elliptical, smooth, the orifice contracted and even. 
Through the liberality of Mr Bean, I am enabled to give a figure 
— the most perfect one which has been yet published — of this rare 
species. Its synonymes are somewhat confused. Pallas affirms, cor- 
rectly in my opinion, that the Sea- Spleen wort of Ellis is not the Ser- 
tularia Lichenastrum of Linnaeus as generally asserted, and he has 
described a different species considered by him as identical with the 
Linnaean. The figure of Ellis is quoted by Pallas as an admirable re- 
presentation of his own S. articulata, but in the description of this 
the branches or pinnae are said to be opposite, whereas in Ellis’s fi- 
gure, and in our own, although less decidedly, they are regularly al- 
ternate. Ellis notices under his S. Lonchitis a foreign variety with op- 
posite cells and pinnae, having “ the joints both on the stem and branch- 
es much closer together and it will probably be found that this con- 
stitutes a distinct species, hitherto confounded with others nearly 
allied. 
8. Antennularia,* Lamarck. 
Character. Polypidom plant-like, horny , simple or branch- 
ed irregularly , the shoots fistular, jointed , clothed with hair-like 
verticillate branchlets : cells small , sessile , campanulate , unilate- 
ral : vesicles scattered , unilateral — Polypes hydraform . 
1. A. antennina. — Mrs Ward, f 
Plate XVI. 
Lobster’s -horn coralline or Sea-beard, Ellis , Corall. 15, no. 14, pi. 9, fig. 
a, b, A. B. C. Phil. Trans, xlviii. 630, tab. 22, no. 3. Phil. Trans. 
abridg. x. 491, pi. 12, fig. 3, C. Sertularia antennina, Lin. Syst. 
1310. Pall. Elench. 146. Ellis and Soland. Zooph. 45. Berk. Syn. i. 
217. Turt. Gmel. iv. 679. Wern. Mem. i. 564. Turt. Brit. Faun. 
* From Antennula , diminutive of antenna , a term applied to the feelers of in- 
sects. 
f “ Found on the rocks by Mrs Ward, an ingenious gentlewoman of Gisburgh 
in Cleveland, Yorkshire, arid by her named Sea-beard ; I suppose from its grow- 
ing in a thick tuft; Mr Lawson.” — Ray. 
