96 ANTIIOZOA HYDROIDA. 



PLATE XXL Fig. 4, 5. 



Fucoides setis minimis indivisis constans, Raii Syn. i. 39, no. 7, tab. 2, fig. 2, lit. a. 

 (injured and deprived of the pinnae.) Sertularia pinnata, Lin. Syst. 1312. Ellis 

 and Soland. Zooph. 46. Oliv. Zool. Adriat. 290. Aglaophenia pinnata, Lamour. 

 Cor. Flex. 1 72. Plumularia pinnata, Lam. Anim. s. Vert. ii. 127 : 2de edit. ii. 

 164. Risso L'Europ. merid. v. 313. Johnston Trans. Newc. Soc. ii. 260 ; and 

 in Mag. Nat. Hist. vi. 498. Hassatt in Mag. and Ann. N. Hist. vii. 285. 

 Macgillivray in Ibid. ix. 464. Couch Zooph. Cornw. 17. Corn. Faun. iii. 34. 



Hob. On shells, stones, and other corallines in deep water. 



In general about one inch and a half, but sometimes attains the 

 height of four, or even six inches, very delicate, of a white, or, 

 rarely, horn colour, simple, plumous, and pretty. The rachis is 

 compressed, straight, jointed, the internodes about six times longer 

 than their diameter, and each giving origin to three pinnae, in 

 which character I find a ready distinction between this and the follow- 

 ing species. There is a minute tooth-like spine, only visible under 

 the microscope, between the cells, which are perfectly transparent, 

 and admit a distinct view of the polypes. These have a reddish 

 body and numerous tentacula. The vesicles are rarely produced, 

 but then profusely, and most of the specimens on which I have 

 seen them have lost almost all their polypiferous pinnae. At the 

 base of the remnants they occur clustered, and are pear-shaped, 

 with an aperture which, after the expulsion of the ova, is cut into a 

 circle of spinous teeth, or, as Ellis expresses it, "the tops of the 

 ovaries are divided like a coronet." 



Plumularia pinnata, Mr. Hassall observes, "is generally found 

 growing on a long filamentous sea-weed, up the stem of which 

 it creeps often for more than a foot in extent, and round which 

 the root-fibres form a complete sheath. The specimens thrown 

 up by the sea are usually denuded of the short branches which 

 proceed from the pinnae. The vesicles are produced in great 

 abundance, pyriform, blunt and plain above : each vesicle contains 

 three or four dark-coloured ova." 



Mr. Peach has specimens with five, four, and three pinnae on the 

 internodes of the stem, and all proceeding from the same polypidom. 

 The specimens are from deep water, and are remarkably fine. 



p. 154, &c. ; Thomson's Hist. Roy. Soc. p. 26 ; and Brewster's Edin. Encyclopaedia, 

 v. vii. p. 742 ; a good article contributed by my worthy friend Dr. Neill. Haller's 

 notice of his friend is short, but interesting ; Bib. Bot. v. ii. p. 124 : and not less so 

 the eulogium of his admirer, Dawson Turner. Richardson's Correspondence, p. 210. 



