SERTULARIA. 
57 
Mediterranean; it is about three inches long, is pale and 
horny; the stem is rather angular, with arched protuberances 
opposite the branches; the denticles are seated in a socket 
furnished with a short spine on the lower part. 
17. Sertularia hypnoides.—Denticles pointing one way, 
campanulate, toothed, and beaked; stems with pinnate 
branches, and very crowded subdivisions.—-It inhabits the 
Indian ocean, is six inches high; in colour it is brown, with 
yellowish imbricate radicles. 
18. Sertularia speciosa.—Denticles campanulate, effuse, 
toothed, and stipulate; the stem is pinnate, rigid, with in¬ 
curved branches, mostly pointing one way.—It is found in 
the Indian ocean, adhering to the tubular radicles of gor- 
goniae; it is brown, horny, and from three to four inches long. 
19. Sertularia falcata.—The denticles of this species point 
all oneway; they are imbricate and truncate; the vesicles 
are ovate; the branches are pinnate and alternate. There is 
a variety of this species described by Ellis, in his work on 
Corallines.'—It inhabits the European and Indian seas, and 
is from three inches to a foot long; the stem is a little flexu- 
ous ; the denticles in a single row. 
20 . Sertularia pluma.—In this the denticles point one 
way, they are imbricate and campanulate: the vesicles are 
gibbous and crested; the branches are pinnate, alternate, and 
lanceolate.—It is found on most European coasts, climbing 
upfuci; the branches are jointed; the denticles are serrate 
at the margin, and supported in front by a small hollow 
spine; the vesicles have a denticulate margin, and generally 
five oblique crested rrbs. 
21. Sertularia echinata.—Denticles qpposite, pointing 
one way, campanulate ; the vesicles are crested; the branches 
pinnate, alternate, and lanceolate.—It inhabits chiefly the 
shores of Sweden, on fuci. 
22. Sertularia antennina.—The denticles are verlicillate, 
in fours, setaceous; vesicles obliquely truncate, verticillate; 
the stems are generally simple. There is a variety which is 
branched.—They are both found on the British coasts, often 
nearly a foot high; it is yellow, with very fine capillary 
yellowish radicles; the stem is surrounded with small in¬ 
curved setaceous branches, on the upper sides of which are 
rows of small cup-shaped denticles; the vesicles are placed 
on pedicles obliquely open towards the stem, and placed 
round it at the insertion of the branches. 
23. Sertularia verticillata.—The denticles in this are 
obsolete; the vesicles campanulate, toothed round the rim, 
on long twisted pedicles, and placed in fours round the stem; 
the branches are alternate.—It is found on the British coasts; 
stem ribbed, very loosely branched; the denticles are not 
visible; the vesicles are nearly erect, and glutinous; the 
ovaries are oval, ending in a tubular mouth. 
24. Sertularia gelatinosa.—Vesicles campanulate : stem 
with numerous decomposite spreading branches.—It is found 
on the coasts of the Netherlands; is half afoot long, and of 
a greyish-brown colour. 
25. Sertularia volubilis.—The denticles in this are obsolete; 
the vesicles are alternate, campanulate, toothed round the 
rim, on long, twisted pedicles; the branches are alternate.— 
It inhabits the European seas, climbing up o therms t-Wu/mee ; 
it is whitish and minute; the ovaries are egg-shaped and 
smooth, or transversely wrinkled. 
26. Sertulariasyringa.—Denticles obsolete; vesicles cylin¬ 
drical, mostly alternate, and placed ou short twisted 
pedicles. 
27. Sertularia cuscata.—Denticles obsolete; vesicles ova], 
axillary; branches opposite and simple.—It is found in the 
European seas, adhering to fuci. 
28. Sertularia pustulosa.—Stem with alternate dichotomous 
branches, obsoletely denticulate on the upper part.—It in¬ 
habits the shores of the Isle of Wight, and is four inches 
long. The stem is seen rising into alternate dichotomous 
joints, with small denticles, haying a circular rim, with a 
point in the middle of each towards the upper part of each 
joint. 
29. Sertularia frutescens.-—Denticles cylindrical, campanu¬ 
late, placed in a single row on the inside of the branches; 
V 04 ,. XXIII. No. 1554. 
the branches are alternate, and pinnate—This is chiefly 
found on the British shores; rather hard, blackish with 
brown branches; the stem is composed of small united 
tubes. 
30. Sertularia pinaster.—In this species the denticles are 
opposite, sessile, with an incurved tubular tip; the vesicles 
are large, ovate, quadrangular; the angles terminating in a 
spine, and furnished with a tubular mouth in the centre, 
placed in a row along the branches; the branches are alter¬ 
nate. 
31. Sertularia pennatula.—The denticles in this are in a 
single row, crenate on the rim, and supported by a slender, 
truncate, incurved horn; the branches are opposite.—It is 
found in the Indian ocean; is five or six inches long; 
yellowish-brown; the denticles have two opposite spines on' 
the rim. 
32. Sertularia filicula.—Denticles opposite, ovate, with a 
single erect one at the junctures of the branches; vesicles 
obovate, with a tubular mouth in the centre; the stem is 
zig-zag, with alternate branches. — It inhabits the British 
shores, is very tender, and the stem is much branched. 
33. Sertularia quadridentata.—Denticles in fours, oppo¬ 
site, at the joints of the stem; the stem is simple, with the 
joints tapering and twisted towards the base.-—It inhabits the 
African shores on the fucus lendigerus. 
34. Sertularia spicata.—Denticles in three, cylindrical, 
terminal, and nearly closed at the mouth; vesicles ovate, 
axillary; steba tubular, panicled, annulate, with trichotomous 
branches disposed in whorls round the rings. 
35. Sertularia Evansii.—The denticles are short and op¬ 
posite; the vesicles are lobed, arising from the branches 
which are opposite.—It inhabits the British coasts, and is 
found on fuci: it is two inches high, very slender, and yel¬ 
low, with fulvous vesicles. 
36. Sertularia muricata.—The denticles of this species are 
pedicled, proceeding alternately from the joints of the 
branches; vesicles oval, spinous; the stem is jointed.—It is 
found on the shores of Scotland; the vesicles are nearly glo¬ 
bular, placed on pedicles, and full Of pointed spines from 
crested ribs. 
37. Sertularia secundaria.—Denticles in a single, campa¬ 
nulate ; the vesicles are axillary; the stem is minute, white 
and incurved.—This species is found in the Mediterranean : 
it is scarcely three lines high, and not thicker than a fine 
bristle. i 
38. Sertularia misenensis.—The denticles are alternate, 
very thin, spreading ; the vesicles are oval, peduncles axil¬ 
lary; stem much branched, dichotomous.—It inhabits the 
Mediterranean, is very slender, pellucid towards the tip, and 
sometimes covered with the cancer linearis. 
39. Sertularia purpurea.-—Denticles sub-ovate, tubular, in 
four imbricate rows; the vesicles are erect and campanulate; 
the branches are dichotomous and square.—It inhabits the 
sea round Kamtschatka, and is of a blackish-purple. 
40. Sertularia articulata.—Denticles pressed together; the 
vesicles are ovate, rather large, covered with the lid, and 
placed in a single row; the stem is jointed and pinnate.—It 
is found in the Atlantic ocean, creeping on shells, and is about 
two inches long; pale yellow. 
41. Sertularia filicina.—Denticles imbricate, placed on 
one side only; vesicles jointed; stem granulate, branched 
and pinnate, the subdivisions alternate.—It inhabits the 
Indian ocean, is pale, and about three inches long. 
42. Sertularia fruticans.—The denticles of this species are 
in a single row on one side, semi-campanulate ; the stem’ is 
granulate, woody, with alternate setaceous subdivisions.—It 
inhabits the American seas in tufts, on shells: it is six inches 
long, and of a yellowish-grey. 
II.—The species of this division have a crusfaceous stem, 
inclining to stone, and composed of rows of cells; they 
have no vesicles, but in the place of these there are small 
globules. 
43. Sertularia bursaria.—Denticles opposite, compressed 
and truncate; the stem is branched, and dichotomous.—It is 
Q found 
