CODIUM. 193 



therefore deserving of being spoken of among the pioneers 

 of civilization, which prepare a resting place for colonies of 

 other plants and animals. In Brongniart's ' History of Fossil 

 Vegetables ' a fossil is figured (PL 9 bis, Jig. 1) under the 

 name Fucoides hypnoides, which bears a very close resem- 

 blance to Caulerpa hypnoides, a. recent species from New Hol- 

 land; and several other fossils, which appear to be the 

 remains of species of Caulerpa, are known to palaeontologists. 



SYNOPSIS OF THE BRITISH (MARINE) GENERA. 



I. CODIUM. Filaments closely combined into a sponge- 



like frond. [Plate 24, A.] 



II. BRYOPSIS. Filaments free, pinnately branched. [Plate 



24, B.] 



III. VAUCHERIA. Filaments free, irregularly branched. 

 [Plate 24, C.] 



I. CODITJM. Stackh. [Plate 24, A.] 



Frond spongy, dark green (crustaceous, globular, cylindri- 

 cal or flat), composed of an interwoven mass of tubular, con- 

 tinuous filaments. Fructification : opaque vesicles attached 

 to the filaments, near the surface of the frond. Grev. Name, 

 fco&ov, the skin of an animal ; from the soft substance. 



1. C. Bursa, L. ; frond spherical, hollow. Grev. Ala. 

 Brit. p. 186; Hook. Br. Fl. ii. p. 318. Fucus Bursa, E. 

 Bot. t. 2183. 



On rocks iu the sea, very rare. Perennial ? Summer. " Coast of Sus- 

 sex, plentifully, Pallas;" Turner. Shores of Cornwall, Mr. Rashleigh. 

 Near Torquay, Mrs. Griffiths. Belfast, Mr. Templeton. Frond a globu- 

 lar, spongy, hollow ball, 1 8 inches in diameter. Structure similar to the 

 preceding. 



2. C. adhaerens, Ag. ; frond forming a velvety crust on 

 the surface of rocks. Harv. in Hook. Journ. Bot. p. 305 ; 

 Wyatt, Ala. Damn. No. 127; Harv. Phyc. Brit. t. xxxv. A. 



On rocks in the sea, near low-water mark ; very rare. Annual? At 

 Torquay, Mrs. Griffiths. Land's End, Mr. Ralfs. Gorran Haven, &c., 

 Mr. Peach. Falmouth Harbour, Miss Warren. Bathlin Island, Antrim, 

 Mr. Moore. Tory Island, Mr. Hyndman. Spreading over the rock in 

 irregular patches of two feet or more in extent, resembling " fragments of 

 beautiful green velvet." Substance gelatinous, dense, closely adhering to 

 paper. Mrs. Griffiths, who has watched this plant from its first appear- 



O 



