4 
a tube by the action of the animal, the arms or tendrils are 
employed in laying hold of the particles of sand and applying 
them to the yet adhesive surface. 
TEREBELLA. 
GENERIC CHARACTER: Tube lengthened, cylin- 
drical, slender and pointed at the base; membranous, 
with grains of sand and fragments of shells adhering 
round it; open only at the top. 
* T. CHRYSODON. Sabella C. Mont. Test. Brit., vol. 2, 
p. 546. Common in firm sand, near low water mark; in 
some places thickly studding the ground. 
4 T. CONCHILEGA. Sabella C. Pen. Brit. Zo., vol. 4, 
p|. 26, lower figure. Stew. Elem., vol. 2, p. 423. Mont. 
Test. Brit., vol. 2, p. 547. On dead shells from deep 
water. 
* T. LUMBRICALIS. Sabella L. Stew. Elern , vol. 2, 
p. 423. Mont. Test. Brit., vol. 2, p. 549. Common, on 
shells, from deep water. 
T. CTRRATA. Sabella C. Mont. Test. Brit., vol. 2, p. 550. 
This is the largest, stoutest, finest, bnt most brittle, of the 
British species. It lives in deep water, and is probably 
less rare than it seems to be. 
The above form the whole of the species comprized in 
the kindred Genera Sabellaria and Terebella that I can 
venture to include in the list of Cornish Shells. But 
although differently allied, Siphunculus Strombus (Fleming's 
British Animals, p. 491) must also be enumerated among 
creatures which construct their habitation of agglutinated 
sand. This it does by straitening the orifice of the shell of 
Rostellaria Pes Pelecani; and forming it into an elevated 
nest, within which its takes up its permanent abode. 
AMPHITKITE. 
GENERIC CHARACTER. Tube lengthened, cylindrical, 
the hinder extremity tapering, membranous or leathery; 
the outer surface generally naked. 
A. PENICILLUS. Sabelia' P. Mont. Test. Brit., vol. 2, 
p. 541. Cylindrical, size of a crow quill, 3 inches long* 
tapering and a little flexuous at the base, where alone it is 
fixed; the upper portion free, and floating. The surface 
smooth, as if covered with a muddy coaling, nearly black, 
and finely marked witli circular lines. On the Pinna 
Ingens, and sometimes on Sertularia Abietina growing 
on it: from the depth of 40 or 50 fathoms. 
SERPUL/EA. 
Tube solid, calcareous; the branchiae covered with an 
operculum. 
