TiiuiARiA. Z. HYDIIOIDA. 137 



of corallines, a sessile vesicular body filled with milk-white granules, 

 resembling- very exactly the oviferous vesicle of a Sertularia, but of 

 what species I am unable to say, if indeed it belongs to any. It is 

 rooted, subsessile, roundish, slightly flattened on the sides, smooth, 

 with a short tubulous even aperture. Fig. 10, page 92. It has no at- 

 tachment to any organized body. Can it be the nidus of some mi- 

 nute Fusus or Purpura ? 



7. Thuiaria, * Fleminor. 

 Character. Pulypidom plant-like, rooted hy a tubular Jihre, 

 erect, dichotomously branched or pinnated ; the cells sessile, bise- 

 rial, adnate to the racliis or " imbedded in the substance of the 

 stem and branches ;" vesicles scattered. — Polypes hydraform. 



1. Th. Thuia, cells ovato-elliptical, rather acute; vesicles 

 pear-shaped. Sir Robert Sibbald.f 



Plate XIV. and XV. Fig, 1, 2. 



Plaiita marina equiseti facie, Sib- Scot. ill. ii. lib. iv. 55, tab- 12, fig. 1 



Fucus equiseti facie, Ibid- lib. i. 56. Rail, Syn. 50, no. 47 — ^ — Bottle- 

 brush Coralline, Ellis, Corall. 10, no. 9, pi. 5, fig. b. B Sertularia 



thuja, Z(«. Syst. 1308. Pall. Elench. 140. Ellis and Soland. Zooph. 

 41. Berk. Syn. i. 217. Turt. Gmel. iv. 678. Wern. Mem. i. 564. 

 Turt. Brit. Faun. 213. Bosc, Vers, iii. 109. Slew. Elem. ii. 442. La- 

 moitr. Cor. Flex. 193. Corall. 84. Hogg's Stock. 32. Risso L'Europ. 



Mend, v, 311 Cellaria thuia, Lam- Anim. s. Vert ii. 339. Stark, 



Elem. ii. 439 Thuiaria thuia, Flem. Brit. Anim. 545. Johnston in 



Trans. Newc See. ii. 261 — La Biseriare thuia, Blainv. Actinol. 482, pi. 

 81, fig. 3. 



Hab. On shells from deep water. " They are found on the coast 



Formed from ^u'ttt — a cedar. There is a Thuarea in Botany, so near to 

 the zoophytical genus in sound as to render this name objectionable. The Thu- 

 area is formed from the name of the botanist A. du Petit-Thouars. 



■f There is a very interesting life of Sir Robert, written by himself, in the 

 Analecta Scotica, v. i. p. 126 et seq. It is printed in a separate form with the 

 title " The Autobiography of Sir Robert Sibbald, Knt. M. D. ; to which is pre- 

 fixed a short account of his MSS." 8vo, published by Thomas Stevenson, Edin. 

 1833. The pamphlet forms the basis of his Life prefixed to the 20th vol. of 

 the " Naturalist's Library," with which a portrait is also given. Sir Robert was 

 born 15th April 1641 ; graduated in 1662 ; was knighted in 1682 ; and died 

 probably in 1 722, for the precise date has not been ascertained. See Pulteney's 

 Sketches of the Progress of Botany, v. ii. p. 4-8. The following Elogium is 

 from the Second Series of the ATialecta Scotica, p. 153, Edin. 1837. 



" Illustrata simul decorat, pariterque Sibaldum 



" Scotia, scriptori lumine grata suo." 



