34 G H E L M I N T 
III, Testacea. Mollufca covered with a fhell. 
i. Multivalves; fells with many valves. 
Chiton. - - Valves placed in tranfverfe plates down 
the back.—The ofcabrion. 
Lepas. - - Valves unequal; body feflile.—The 
acorn-fhell. 
Phloas. - - Shell bivalve; with acceffory valves at 
the hinge.—Inhabits the fhores of moft 
feas, and fhines by night. 
2. Bivalves ; Jhell with tzoo valves. Conchs. 
Mya. ... Hinge with generally a broad thick tooth, 
not let into the oppofite valve. The 
pearl-oyfter.—Inhabits chiefly the bot- 
bom of the fea. 
Solen. - » Shell open at each end ; hinge with a 
Tingle or double Tabulate reflected 
tooth, not let into the oppofite valve. 
—The razor-fheath, or knife-handle. 
Tellina. - - Hinge with the lateral teeth of one valve 
not let into the other.—Inhabits all 
feas., 
Cardium. - Hinge with reiflote penetrating lateral 
teeth.-—The cockle. 
Madtra. - - Hinge with a complicated triangular mid¬ 
dle tooth, and an adjoining hollow.— 
Found in all feas. 
Donax. - - Hinge with a generally-remote lateral 
tooth, not let into the oppofite valve. 
—In all feas. 
Venus. - - Hinge with generally three approximate 
divaricate teeth.—In all feas. 
Spondylus. - Hinge with two teeth l’eparated by a fmall 
hollow.—Thorny oyfler. 
Chama. - - Hinge in one fhell, with two oblique ob- 
tufe teeth.—1 he gaper, or bafon-fhell. 
Area. - - Hinge with numerous penetrating teeth. 
—Noah’s ark. 
Ollrea. - - Hinge without teeth, but an ovate hol¬ 
low.— 1 he common oyfler. 
Anemia. - - Hinge without teeth, but generally a li¬ 
near depreflion on the rim, the beak of 
one valve curved over the hinge.— 
The fringed oyfler. 
Mytilus. - - Hinge without teeth, with a Tubulate de- 
preflion, and generally fixed by a filky 
beard.— 1 lie mulTel. 
Pinna. - - Hinge without teeth; valves united at 
one end and open at the other.—The 
nacre. 
3. Univalves, with a regular fpire. 
Argonauta. - Shell with one cell, fpiral involute. —The 
argonaut. 
Nautilus. - Shell with many cells, with a hole of 
communication.—The nautile. 
Conus. - - Aperture eft’ufe, longitudinal, without 
teeth.—The cone. 
Cypraea. - - Aperture ert'ufe, linear, longitudinal, 
toothed each fide.-—The cowry. 
Bulla. - - Aperture a little contracted, and placed 
obliquely'.—The dipper,or pewit’s egg. 
Voluta. - - Aperture etfufe; the pillar plaited.— 
The mitre, or volute. 
Buccinum. - Aperture with a fmall canal leaning to 
the right.—The wnelk. 
Strombus. - Aperture with a fmall canal leaning to 
the left.—Spiral (hells. 
Murex. - - Aperture with a f;nall ltraight canal.— 
Muncated or rocky fhells. 
Trochus. - Aperture contraCtedand lomewhat fquare. 
—Sea-tops. 
Turbo. - - Aperture contrafled and orbicular.—Tur¬ 
binated or wreathed fhells. 
H O L O G Y. 
Helix. - - Aperture contracted, lunate on the inner 
fide.—The fnail. 
Nerita. - - Aperture contracted and femi-orbicular. 
—The nerite. 
Haliotis. - - Shell with a row of orifices along the 
furface.—The fea-ear, 
4. Univalves , without a regular fpire. V 
Patella. - - Shell conic, the aperture widened like a 
bafon.—The limpet. 
Dentalium. - Shell (lender, Tubulate, open at both 
ends.—The dentale, or fea-tooth. 
Serpula. - - Shell tubular, moftly ferpentine, adher- 
, ‘ ing to other bodies. 
Teredo. - i Shell thin, pierced into wood.—The 
fli ip-worm. 
Sabella. - - Shell compofed of agglutinated grains of 
fand. 
IV. Zoopkyta. Compofite animals efflorefeing'like 
vegetables. 
1. With a hard calcareous fem. Lithophytes. 
Tubipora. - Coral, with cylindrical tubes.—The tU’ 
bipore. 
Madrepora. Coral, with concave (tars.—The niadre- 
pore. 
Millepora. - Coral, with fubulate pores.—The mille. 
pore. 
Cellepora. - Coral, with hollow round cells.—The 
cellepore. 
Ifis. - - - Stem (tony.—The true coral. 
2. With a fof ter fem. 
Antipathes. - Stem horny, befer with fmall fpines, and 
covered with a gelatinous flefby coat. 
Gorgonia. - Stem horny, and covered with a cellu¬ 
lar or vafcular coat —The gorgon. 
Alcyonium. - Stem corky.—The fea-purfe ; fea-fig, See. 
Spongia. - Stem ftringy, flexile, bibulous.—The 
fponge. 
Fluftra. - - Stein covered with minute cellularpores. 
—The horn-wrack, or Tea-mat-. 
Tubularia. - Stem tubular, filiform. 
Corallina. - Stem with filiform calcareous joints.— 
The coralline. 
Sertularia. - Stem with filiform fibrous joints. 
Pennatula. - Stem coriaceous, relembling a quill.—- 
The fea-pen. 
Hydra. - - Stem medullous, naked.—The polype. 
V. Infusoria. Simple microfcopic animalcules. 
1. With external organs. 
Brachionus. - Body covered with a fhell, and ciliate at 
the tip. 
Vorticella. - Body naked, and ciliate at the tip. 
Trichoda. - Body hairy on one fide. 
Cercaria; - Body rounded, and furni/hed with a tail. 
Leucophra. - Body every where ciliate. 
2. Without external organs, fattened. 
Gonium. - Body angular. 
Colpoda. - Body finuate. 
Paramecium. Body oblong. 
Cyclidium. Body orbicular or ovate. 
3. Without external organs, round. 
Burfaria. - Bouy hollow li*e a purfe. 
Vibrio. - - Body elongated. 
Enchelis. - Bouy cyiindraceous. 
Bacillal ia. - Body compofed 01 ltraight firaw-like fila¬ 
ments, varying in pontion. ' 
Volvox. - - Body lphericai. 
Monas. - - Body a mere point. 
Of INTESTINAL WORMS. 
The denomination, “ Vermes Intef inales , 11 given to this 
order by Linnaeus, is not to happily cnoicn as might be 
wilhed 5 
