Tub ul aria. 
Z. HYDROIDA. 
113 
On examining- a few tubes under the microscope I perceived in one of 
them, and only in one, a crowd of minute elliptical bodies which were 
in active motion, running- up the tube on one side, and down on the 
other, but frequently crossing-, nor was it uncommon to see one ac- 
celerate its pace and beat the others in the race. The tube had lost 
its head, and the moving- bodies were evidently, as I think, infusory 
animalcules which had got admission into it ; — the currents they 
created are therefore to be distinguished from those observed by Mr 
Lister, analogous to the circulation in the Tubularia and Sertula- 
riadae. 
4. Tubularia,* Linnaeus. 
Character.— Polypidom rooted , more or less plant-like , hor- 
ny, Jistular , simple or branched ; no cells — Polypes protruding at 
the ends of the tubes or branchlets , non-retractile , the head crested 
with one or two circles of tentacula. 
* Tubes undivided. 
1. T. indivisa, tubes clustered , simple , cylindrical , narrowed 
and interwoven at the base : head of the polype crested with two 
rows of tentacula . E. Lhwyd. f 
Plate III. Fig. 1, 2. 
Remarkable Sea-plant, Lhwyd in Phil. Trans, abridg. vi. 73, pi. 3, fig. 1. 
(pessima.) Adianti aurei minimi facie planta marina, Raii , Syn. 31, 
no. 4. Jussieu in Mem. Acad. Roy. des Sc. 1742, p. 296, tab. 10, fig. 
2. Tubular coralline like oaten pipes, Ellis in Phil. Trans, xlviii. 
tab. 17, fig. D. Ibid, abridg. x. 453, pi. 10, fig. D. Corail. 31, no. 
2. tab. 16, fig. C. Tubularia indivisa, Lin. Syst. 1301. Soland. 
Zooph. 31. Berk. Syn. i. 214. Turt. Gmel. iv. 666. Blumenb. Man. 
272. Turt. Brit. Faun. 210. Stew. Elem. ii. 437. Wern. Mem. i. 
563. Lam. Anim. s. Vert. ii. 110. 2de edit. ii. 125. Lamour. Cor. 
* Formed from tubulus — a little hollow pipe. 
f Edward Lhwyd or Lloyd (as Dillenius spells the name) was born in 1670 
and died in July 1709. He was keeper of the Ashmolean Museum, Oxford, and 
was distinguished among his contemporaries for knowledge in antiquities and 
natural history. “ He is indeed,” writes Archdeacon Nicolson, afterwards 
Bishop of Carlisle, and a very competent judge, “ if I may judge of him, the 
greatest man (at antiquities and natural philosophy together) that I have had 
the happiness to converse with.” Letters to R. Thoresby, F. R. S. v. i. p. 206. 
Ray gratefully records his assistance in the Synopsis and Hist. Plantarum and 
Petiver frequently mentions him as his “ worthy,” “ curious,” and “ generous 
friend.” Of his life and writings the reader will find an account in Pulteney’s 
Sketches of Botany in England , v. ii. p. 110-116 : and some additional particu- 
lars in the “ Analecta Scoticaf especially in the Second Series published at 
Edinburgh during the present year. 
H 
