Pl. cell. aph. 2. THALASSIOPHYT A. 52. Aleyon. 353 
Alcyonidium diaphanum. Transparent halcyonide. 
Thallus nearly round, branched; branches short. 
Fucus spongiosus nodosus, Raii Syn. 49,42; Ger. em. 1570. 
Spongia ramosa altera Anglica, Park. 1304, 
Alcyonium gelatinosum, Lin. Syst. Nat. 1, 1295. 
Ulva diaphana, Huds, Fl. Angl. 5170; Engl, Bot, 363. 
Alcyonidium diaphanum, Lamour. Thal. 71. ' 
Sea ragged staff. 
Thallus 6 to 12 inches long; branches irregular, rather 
acute; sporidia large, yellowish. 
_ B. flavescens. Branches obtuse. 
Ulva flavescens, Huds, Fl. Ang!. 570. 
XXVIII. 53. EPHIDATIA. Lamourovux. Ephidate. 
Thallus sessile, orbicular, lobed, gelatinous, cellular, 
greenish; cells long, pentagonal, radiating from a common 
point, open at top; sporidia elliptical, enclosed in the cells. 
—Fresh-water. 
Ephidatia Gibbsii. Gibbs ephidate. 
Thallus sessile, thick, slightly lobed, more ox less orbi- 
cular, fetid. 
Bottom of the reservoir in the Green Park, Mr. Gibbs. 
Thallus orbicular or ocblong.—This may be the following 
species, but Lamarck describes the cells of spongilla as ir- 
regular; or it may be an alcyonella; I could not, however, 
perceive any polypi in it, but plenty of sporidia. 
XXIX. 54. SPONGILLA. Lamarck. Spongille. 
Thallus sessile, polymorphous, irregular, cellular and 
lacunose ; ce//s unequal, formed of membranaceous lamin, 
scattered without any order; sporidia free, in the.cells. 
1. Spongilla pulvinata. Cushion spongille. 
Thallus rather incrusting, sessile, thick, convex, slightly 
lebed ; lacune longish, scattered. 
Spongilla pulvinata, Lam. Hist. 2, 100, 
Ephidatia fluviatilis, Lamour. Pol, 6. 
Bottom of rivers. 
2. Spongilla ramosa. Branched spongille. 
Thallus sessile, branched; branches long, roundish, un~ 
equal, rather lobed. 
VOL, 1. ZA 
