Antennularia. Z. HYDliOlDA. 139 



pellucid, the stem nearly equal in diameter throughout, compressed 

 upwards, finely wrinkled when dry, divided by joints not regularly 

 equidistant, naked on the lower halt, 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 oi'ifice 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 aflSrms, cor- 

 rectly in my opinion, that the Sea-Spleenwort 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 

 Linnsean. 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. Elhs 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^ hoimy, simple or hranch- 

 ed irregularly, the shoots fistular, jointed, clothed with hair-like 

 verticillate hranchlets : cells small, sessile, campanulate, unilate- 

 ral : vesicles scattei'ed, unilateral — Polypes hydraform. 



1. A. ANTENNiNA. — Mrs Ward, -f- 



Plate XVI. 



Lobster's -boin coralline or Sea-beard, Ellis, Corall. 15, no. 14, pi. 9, fig. 

 a, b, A. B. a Phil. Trans, xlviii. G30, tab. 22, no. 3. Phil. Trans. 



abridg. x. 491, pi. 12, fig. 3, C. Sertularia antennina, Lin. Syst. 



1310. Pall. Elench. 146. Ellis and Solaiid. Zooph. 45. Berk. Syn. i. 

 217. Tint. Gmel. iv. 679. Wern. Mem. i. 564. Turt. Brit. Faun. 



* From Antennula, diminutive oi antenna, a term applied to the feelers of in- 

 sects. 



•)• " Found on the rocks by Mrs Ward, an ingenious gentlewoman of Gisburgh 

 in Cleveland, Yorkshire, and by her named Sea-beard ; I suppose from its grow- 

 ing in a thick tuft; Mr Lawson." — Raij. 



