History of British animals - University of Guam Marine Laboratory

Flustra. ZOOPHYTA. FLUSTRADyE. 535Gen. LVI. FLUSTRA.— Foliaceous or encrusting, cells contiguous,arranged in regular series, formingmat-like expansions; polypi fixed to the bottom of the cell, retractile ;ovaria like pearly excrescences on the summits of the cells.* Foliaceous and branched, with cells on both sides of the leaves,139- F. Jbliacea.— Extremities rounded, cells narrow at theproximal, and arched at the distal, extremity, with scatteredmarginal denticles.Fucus telam lineam sericeamve textura sua semulans, Ray, Syn. Stirp. 42.— Eschara fol. Ellis, Coral. 70. t. xxix. f. 2 Flustra fol. Linn. Syst.i.1300 Escli. fol. Pall. El. 52.—Common on hard ground,in a fewfathoms water.Height several inches, dividing irregularly, frequently palmate the teeth;on the margin of the cells are short conical processes, usually in pairs, oneach side at the upper angles.The substance is rigid. Body of the animalis nearly twice as long as the cells, with about fourteen long slender tentacula.140. Y.papyracea.— Extremities hatchet-shaped; cells slightlyenlarged distally, margins smooth.Eschara pap. Ellis, Coral, t. xxxviii Sol. Ellis Zooph. 13.—T. chartacea,Lamour. Cor. 104.— English coast.Height about two inches, irregularly divided ;of a slender delicate texture,like thin semitransparent paper, and of a very light straw-colour. Isthis species distinct from the preceding? A specimen sent me from the coastof Devon by Mr Montagu, as the species referred to by Ellis, had the cellsof the same shape, with similar marginal denticles as F. foliacea, and onlydiffered in being less rigid, a character not to be relied on.141. F. truncata. — Strap-shaped, dichotomously divided,truncated at the extremities, with lengthened quadrangularcells, having smooth margins.Fucus rnarinus scruposus albidus angustior compressus, extremitatibusquasi abscissis, Ray, Syn. Stirp. 43 Narrow-leaved Horn- wrack, Ellis,Cor. 69. t. xxviii. f. 1.— F. trun. Linn. Syst.i. 1300.— Eschara securifrons,Pall. El. 56. — Common on hard ground,in a few fathoms water.Height several inches ; in some cases the branches are nearly of equalbreadth throughout in ; others, numerous leaves arise from the sides of theprincipal ones, which are at first narrow, but speedily reach their usualbreadth, rendering the coralline proliferous. It is less rigidin itsgrowththan F. foliacea, and smooth.** Foliaceous and branched, zoith cells toconfined one side.142. F.carbasea.— Irregularly divided, flat, thin, cells numerous,oblong, narrow, and truncated at the base.Sol. Ellis, Zooph. 14. t. cxi. f. 6, 7. Lamour. Cor. Flex. 104—Coast ofScotland, where it was first observed by Dr David Skene of Aberdeen-Height several inches ; base destitute of tubular roots ; leaves narrow atthe base, increasing in breadth towards the slightly rounded extremity. Thesubstance is thin and transparent, with a tinge of brown ; smooth, from the