G. SPONGIA. 157 



LANK. 



26. Spongia macida. White, crustaceous, and 

 rising in spines. 



Norwegian seas. 



BREAD-LIKE. 



27. Sv O'SG] A panicea. Shapeless and diffuse masses, 

 not more than a finger in thickness ; substance white, 

 very finely cellular; surface sleek, and slightly porous. 



European seas. 



PAPILLARY. 



28. Spongia papillaris, Crustaceous; surface co- 

 vered with conic protuberances more or less elevated, 

 either distinct or coalescent, and in some measure tu- 

 bulous ; substance soft and friable by desiccation. 



American seas. 



BURNING. 



29. Spongia vrens. Of various shapes, porous, 

 somewhat prickly, and downy. 



Western shores of Europe and of North America ; 

 said also to be found in Africa and India. 



NEEDLE-FORMED. 



30. Spongia acicularis. White and solid, exter- 

 nally porous and hard ; internally composed of bun- 

 dled and upright fibres, converging towards the 

 centre. 



Gulf of Genoa. 



N. B. Not improbably an Alcyonia. 



