Haiimeda. ZOOPHYTA. CORALLINADtE. 515 



81. C. squamata. — The short lateral shoots of the branches 

 compressed, and two-edged. 



Cor. anglica erecta, ramulis dense'pennatis, lanceolae forma terminantibus, 

 segmentis ad utrinque latus paululum compressis, Ellis, Cor. p. 49. 

 No. 4. tab. xxiv. f. c. C — English shores. 

 This species is considered both by Pallas and Linnaeus as a variety of the 

 preceding. 



Gen. XXXVI. HALIMEDA.—Joints compressed, crowded. 



82. H. Opuntia. — Branches trichotomou sly divided, the joints 



waved on the margin, and kidney-shaped. 



Cor. op. Ellis, Cor. p. 53. tab. xxv. fig. a. A. b. B. and Zooph. p. 110. 

 tab. XX. f. 6. 



This species has not hitherto been recorded as a British zoophyte, but is 

 said to inhabit the Atlantic and Mediterranean. I, however, possess a spe- 

 cimen, formerly belonging to the late Dr Walker, to which the following note 

 was annexed, in his own handwriting : " Submarine plant from the rocks at 

 Salterness, in Kirkbane. An Bombycina? It covers the rocks with a close 

 turf." It thus appears to be a native of the shores of the Solway Frith. 

 When a joint was macerated in weak acid, the branched tubes supporting the 

 polypi appeared as they are represented by Ellis, ib. tab. xxv. f. A. 1. 



Gen. ISIS. — Axis branched, striated, articulated ; the fleshy 

 crust deciduous after death. 



1. Remains of an Isis " found at Calne, in Wiltshire, in a light yellow co- 

 loured limestone." — Park. Org. Rem. ii. 73. 



Gen. XXXVII. LOBULARIA— InternaUy carneous, with 

 reticulated cartilaginous fibres, and distinct converging cells, 

 opening by stellate pores ; the base where it is attached is 

 broad and compact ; the polypi have a single opening, and 

 8 pinnated tentacula. 



83. L. digitata. Dead-man's-hand. — Polypi with thin pin- 

 nated, pointed, tentacula. 



Alcyonium ramoso-digitatum moUe asteriscis undequaque omatum 



Ray. Syn. p. 31. Ellis, Cor. 83. t. xxxii. a. A. A 2. Phil. Trans, liii. 



p. 431. t. XX. f. 10-13 — A. digitatum, Linn. Syst. i. 1294. Sol. Zooph. 



175. t. i. f. 7 — F. lobatum, Pallas, El. 351 Common in the British 



seas, adhering to shells, rocks, and fuci. 

 The figure is bluntly ovate, especially %vhen young, dividing with age into 

 short rounded lobes, varying from a reddish-orange to a greyish-white ; the 

 pores are stellate and prominent ; the cells are inversely conical. The poly- 

 pi, according to Ellis, when exserted, are conico-tubular, with 8 ridges ; these, 

 I have observed to be armed near the summit, on each side, with a row of 

 diverging spicula, like the particles composing the crust of the Gorgonia ver- 

 rucosa, Ellis, Cor. t. xxvii. No. i. A. 3. The tentacula are depressed, broadest 

 at the base, and terminate in a point ; the pinnulse, are opposite at first, but 



K k 2 



