160 BRITISH SPONGES: 



Man. 534. Schweig. Handb. 421. Templeton in Mag. Nat. 



Hist. ix. 470. Stark, Elem. ii. 442. 

 Spongilla pulvinata, Lam. Anim. s. Vert. ii. 99: 2de edit. ii. 113. 



Gray, Biit. PI. i. 353. 

 Spongilla fluviatilis, Blainv. Actinol. 534, pi. 92, fig. 6. Hogg's 



Stockton, 39. Hogg in Ann. Nat. Hist. i. 478 ; ii. 370 -. iii. 58 and 



459 ; \'i. 315. Hogg in Trans. Lin. Soc. xviii. 363 ; and in 



Charlesicortli's Mag. Nat. Hist. iv. 259. 

 Spongilla lacustris, Blainv. Actinol. 5.34. 

 State /S. Erect and branched, plant-like. Plate xviii. 



Spongia ramosa fluviatilis Nevvtoni, Raii, Hist. PI. i, 81; Sjm. i^ 



30, no. 5. 

 Spongia fluviatilis ? Lin. Fl. Suec. 440, no. 1191. 

 Spongia lacustris, Esper, Spong. tab. 23, fig. 1, 2. 

 Spongia caiialium, Titrt. Gmel. iv. 662. Hose Vers, iii, 179. 

 Ephydatia canalium, Za?H02/r. Cor. Flex. 6. Corall. 148. Fleming 



in Edin. Phil. Journ. ii, 88. Flem. Phil. Zool. ii, 614, pi. 5, 



fig. 4. 

 Spongilla ramosa, Lain. Anim. s. Vert ii, 100; 2de edit, ii, 114. 



Gray, Brit. PI. i, 353. Dutrochet in " Ann. des Sc. Nat. Oct. 



1828, p. 205 ;" and in Bull, des Sc. Nat. xvii, 156. Stark, 



Elem. ii, 442. 

 Spongilla canalium, Blainv. Actinolog. 534. 

 Spongilla lacustris, Schweig. Handb. 421. 

 Spongilla pulvinata, Templeton in Mag. Nat. Hist, ix, 470. 



Hab. On rocks and other solid bodies at the bottom of deep 

 ponds, lakes and in still running waters, frequent, and found dis- 

 tributed very generally throughout the island. 



Wlien young this sponge " appears in small, round, convex 

 spots of a light grey-coloured, soft, downy substance, adhering 

 to the surface of stones under water, or spreading irregularly as 

 a flat woolly covering of a light greenish-grey colour, having a 

 line or two of thickness, and an extension of one or two inches. 

 But as it advances in growth, it becomes more compact in tex- 

 ture, and of a darker sea-green colour, acquires a thickness of 

 more than two inches, covers a continuous surface of several 

 feet in length, sends up from every part of its surface irregular, 



