UNIVALVES_— SABELLA. 199 
SABELLA.—SaBELLA. 
DESCRIPTION OF PLATE XXXVI. 
Fam. 1. Fig. 1. S. alveolata. Fam. 1. Fig. 2. S. belgica. 
Fam. 1. Fig. 3. §. chrysodon. 
Fig. 4. A fragment of a gigantic specimen of the preceding species. 
Shell tubular, composed of particles of sand, broken shells, and ve- 
getable substances, united toa membrane by a glutinous cement. 
THE covering of the animal of this very extraordinary 
genus is composed of fragments and particles of different 
marine and vegetable productions, adhering to a tubu- 
lar membrane: some are detached, and others are affix- 
ed by the base. The S. ammoniata is covered with 
fragments of the Cornu-Ammonis; the S. Indica, with 
particles of quartz; and the S. clavata, with various small 
stones. The S.alveolata consists of numerous parallel 
tubes, communicating by an aperture, forming when in 
mass the appearance of an honey-comb; the tubes are 
nearly straight, and from two to three inches long: it ad- 
heres to rocks in extensive clusters. The S. rectangula 
is one of the largest of the genus, and often measures 
nine inches in length. 
The S. vegetabilis, and S. arundinacea are covered 
with fragments of twigs, the bark of stems, and broken 
pieces of the Tellina Cornea. 
The greater number of the species inhabit the rivers 
and fresh waters of Thuringia and Belgium, and the 
remainder the Indian, American, Northern, and Euro- 
pean seas. 
Sabulum, whence Sabella is derived, signifies fine 
