AMPHITRITE. SABELLA. 263 



2. AmpMtrite rosea, " Sow.'' 



Ampliitrite rosea, " Sow." Penn. Brit. Zool. edit. 1812, iv. 90. Turt. 

 Brit. Faun. 136. 



3. AmpMtrite lima. 



Amphitrite luna, Dalyell, Pow. Creat. ii. 249. pi. 31. f. 12, 13. 



" The higher extremity consists of forty-four or forty-six tentacula, 

 crowning the body, which projects from an indurated sandy surface 

 covering old shells for about four lines. The tentacula are disposed 

 in lunate or horse-shoe arrangement, resembling the higher portion 

 of Cristatella, fourteen or sixteen occupying the interlines. A web, 

 rising about a fifth up the tentacula, unites the roots of the whole. 

 Diameter of the head or tentacular plume a line and a half. Neither 

 cilia nor antennulae are visible. The animal rises erect from the 

 indurated sand, projecting the head, or hanging over the surface. 

 The termination of the intestinal canal is under the middle of the 

 interior row of tentacula, as in the Cristatella." — Dalyell. 



4. Sabella curta. 



Sabella curta, Montagu, Test. Brit. 554. Turt. Brit. Faun. 203. 

 Penn. Brit. Zool. edit. 1812, iv. 372. 



Hab. The littoral region at low-water mark. 



Desc. " S. with a small short tube composed of sand and minute 

 bits of flat stones, agglutinated to a tough membrane ; sometimes 

 formed wholly of the finest sand, depending entirely on the soil it 

 inhabits : the case is a little tapering to the lower end, by which it is 

 fixed, and which is generally, for a quarter of an inch, destitute of 

 any covering but a flexible membrane, by which it adheres to the 

 shingle under the surface, between high- and low-water marks, and 

 stands about a quarter of an inch above. Length scarce an inch ; 

 size of a crow-quill. 



"This Sabella is gregarious, covering the whole surface of the 

 shore in the inlet near Kingsbridge ; appearing like bits of straw 

 covered with mud, and as close and numerous as stubble in a field. 

 Animal a Terebella, small, of a pale yellowish-green colour ; pro- 

 boscis (operculum) pointed, with a few upright filiform green ten- 

 tacula, and numerous slender ciliated feelers of a pale colour ; these 

 are much longer and more slender than the others, and are in constant 

 motion ; but both are quickly protruded and contracted. When the 

 animal was immersed in spirits the tentacula instantly contracted, 

 and were totally obscured. Being divested of its case, a radiated 

 tuft was perceived on each side of the head : the annulations of the 

 body about sixteen, with as many fasciculi and short peduncles on 

 each side." — Montac/u. 



