PL cell. aph. 2.THALASSI0PHYT/E. 57. Spong. 361 
11. Spongia plumoss. Feathery sponge. 
Thallus irregular, rather soft, tough when deprived of its 
jelly. 
Spongia plumosa, Montague TVern. Tr. 2, 1 16. 
Sea-shores. 
Thallus 3 inches high, 2 inches broad, paler than com- 
mon sponge, not so compressible or elastic, resembles com- 
pressed tow. 
d. Thallus sessile , simple , irregular , creeping on other lodies. 
12. Spongia coriacea . Leathery sponge. 
Thallus indefinite, wrinkled, cavernous. 
Spongia coriacea, Montague Worn. Tr. 2, 116. 
Thallus 4> inches long, 2 broad, not unlike a piece of 
burnt leather. 
13. Spongia tomentosa. Clothlike sponge. 
Thallus irregular, soft, brittle, full of pores, interwoven 
with minute spines. 
Alcyonium ramosum inolle, medullas panis intus simile, Raii $yn.3 1, 1. 
Spongia tomentosa, Lin. Syst. Nat. 1, i299. 
Spongia urens, Ellis Zooph. 187. 
Spongia panicea, Pallas Zooph. 308. 
Sponge like crumb of bread, Ellis Corail. 80. 
Sea-shores and adhering to fuci. 
Thallus orange-colour, soft ; when dry white, extremely 
light, and brittle; when broken resembles crumb of bread, 
and causes a stinging pain like cowage. 
1 4. Spongia sulerosa. 1 Corky sponge. 
Thallus crustaceous, compact, tough, without visible 
pores externally. 
Spongia suberosa, Montague Wern. Tr. 2, 100. 
On old univalve shells, covering them and filling up the 
aperture. 
Thallus indefinite, orange-brown turning brown when 
; a O 
dry. 
XXXIII. 58. TETHYA. Lamarck. Tethya. 
Thallus tubercular, orbicular, inside fibrous ; fibres in 
bundles, stiff; asbestine, radiating from the centre to the 
circumference, scarcely gelatinous. 
