lAG u:nivalvks..,^sf.rpula. 



Politum {Polished T. S) Nt'bulosum, 



Ebiirneinn (Tvonf I'nsk.) Pcllucidum. 



*Ent^]k {Do(/s-toot.h Shell.) ^'itl•eum. 



Arietiiuini. Minutuni. 



Coineum. *Imperforatiim. 



SERPULA— Worm-Shell. 



Animal — a Terehellti: Shell nnividve, tubular, generally 

 adhering to of her substances; ofteu separated internally 

 by divisions at U7icertain distances. 



The genus Serpiila contains forty-eight species; their 

 form throughout is (with few exceptions) exceedingly ir- 

 regular; they are moreover generally found in groups or 

 clusters, adhering to other substances, such as rocks, 

 stones, roots of trees, sides of ships, zoophites, sertulariae, 

 fuci, shells, and corals, &c. &c. They almost all agree in 

 being tubular or pipe-shaped, and are generally twisted 

 or twined into all sorts of spiral and grotesque figures-* 

 some, on the contrary, are nearly straight, and consist of 

 a single tube ; whilst others are collected into large mass- 

 es, containing many hundred spiral and twisted tubes, 

 curiously interwoven or interlaced with each other. 



Amongst those species which are spiral and single (hav- 

 ing their whorls nearly contiguous, something like a He- 

 lix) may be included the Serpula spirillum, Serpula spi- 

 rorbis, and Serpula afra. 



Those sj)eciestliat are single, and nearly straight, are 



