214 OPHELIACE^. 



the circular aperture of the furrow, which is plain, and on a level 

 with the surface. The filaments are laid along the shell, and kept 

 quiet, or moved about like independent worms ; nor could I discover 

 that the proper tentacula were used otherwise than the filaments. I 

 never saw them capture any prey. The excrements are pushed out 

 at the same aperture, and may be seen occasionally collected in small 

 earthy pellets about the margin. They are, probably, moved along 

 the ventral surface by a kind of intestinal motion, and by invisible 

 ciliary currents. 



The worm imparts to diluted spirits a fine sap-green colour. 



(a) Berwick Bay, Dr. Johnston. 



(b) Falmouth. ' 



II. LIMIVORA. 



Les Tubicoles, Cuv. Regn. Anim. iii. 189. M.-Edwards, Elem. 



Zool 2de edit. ii. 224. 

 TuBicoL^, Griff. Cuv. xiii. 7- 

 TuBicoLA, Jones, Anim. Kingd. 189, 221. 

 Annelides sedentaires, Lam. Anim. s. Vert. v. 332. 

 Cephalobranchta, Latr. Fam. Nat. 241. 

 Serpulina, Macleay in Ann. Nat. Hist. iv. 385. 

 Heterocrisia, Blainville in Diet, des Sc. nat. Ivii. 427- 

 LiMivoRA, Grube, Fam. Annel. 29-69. 

 Arexicolid^, Johnston. 



Char. Worms distinctly annular, the rings dissimilar, and dividing 

 the body into head, thorax aud abdomen : head indistinctly defined, 

 without eyes or antennae, and the mouth without teeth or proboscis : 

 thorax with stigmata encircled with short peculiar bristles : feet 

 prominent, armed with bristles, which are always simple, and either 

 setaceous or hooked: branchiae well developed, various in form, 

 labial or attached near the head, and independent of the feet : anal 

 segment without styles. — Tubicolous and marine. The tube is cal- 

 careous, arenaceous, earthy, or membranous. 



Food swallowed in a fluid form, mixed with mud. 



Fam. XL OPHELIACE^. 



Opheliacea, Grube, Fam. Annel. 69. 



Les Ophelies, Cuv. Regn. Anim. iii. 205. Sars in Ann. Sci. Nat. 



ser. 2. vii. 247- 

 OpHELiADiE, Williams in Rep. Brit. Assoc. 1851, 236. 



Char. Body semicylindrical, compressed laterally, the ventral 

 surface flattened ; or nearly cylindrical, fusiform, or rarely exactly 



