PL cell. ctph. 2.TPIALASSIOPHYT7E. 52. Alcyon. 353 
Alcyonidium dxaphanum . Transparent kalcyonide . 
Thallus nearly round, branched ; branches short. 
Fucus spongiosus nodostis, liaii Syn. 49, 42; Ger. cm. 1570. 
Spongia ramosa altera Anglica, Park. 1304. 
Alcyonium geiatinosum. Lin. Syst. Nat. 1, 1295. 
Ulva diaphana, Huds. Fi. stngl. 570 ; Engl. Bot. 36 3. 
Alcyonidium diaphanum, Lamour . Thai. 71. 
Sea ragged staff. 
Thallus 6 to 12 inches long; branches irregular, rather 
acute; sporidia large, yellowish. 
Q.flavescens. Branches obtuse. 
Ulva fiavescens, Huds. FI. Angl. 570. 
XXVIII. 53. EPHIDATIA. Lamouroux. Ephidaie . 
Thallus sessile, orbicular, lobed, gelatinous, cellular* 
greenish ; cells long, pentagonal, radiating from a common 
point, open at top; sporidia elliptical, enclosed in the cells. 
— ~F resh- water. 
Ephidatia Gihbsii. Gills ’ ephidate* 
Thallus sessile, thick, slightly lobed, more or less orbi- 
cular, fetid. 
Bottom of the reservoir in the Green Park, Mr. Gibbs. 
Thallus orbicular or oblong. — 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 ; cells unequal, formed of membranaceous laminae, 
scattered without any order; sporidia free, in the cells. 
1. Spongilla pulvinala. Cushion spongille. 
Thallus rather incrusting, sessile, thick, convex, slightly 
lobed ; lacuntz 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. 
yol. i. 2 a 
