SERTULARIA. 



* Argentea. Denticles nearly oppofite, pointed ; ve- 

 ficles oval ; branches alternate, pai.icled. This is an in- 

 habitant of the European and American ieas ; very much 

 refembles the laft, but the branches are ftiorter and loofer, 

 and the panicle is more obtufe. 



* RuGOsA. Denticles nearly oppofite, obfolete ; veficlcs 

 much wrinkled, and three-toothed ; the branches are fcat- 

 tered. This fpecies inhabits the European feas, and is 

 found growing on the Fluftra foliacea, and other fer- 

 tulariz:. 



* Halecixa. Denticles alternate, tubular, and two- 

 jointed ; the veficles ova!, each united along the fide to a 

 fmall tubular (talk ; the ftem is alternately branched and 

 pinnate. This is found in the European and Mediterranean 

 ieas. It is horny, and of a yellowi(h-grey ; the denticles 

 are nearly obfolete. 



* Thuja. The denticles in this fpecies are arranged in 

 "two rows, clofely adhering to the item ; the veficles obo- 



vate, margined ; item waved and ftiff, with a tuft of dicho- 

 tomous branches near the tip. It is found on tiie northern 

 coafts of England, and in the Mediterranean, and is about 

 half a foot long. 



* MvRlOPHVLLUM. The denticles are truncate, all leaning 

 one way on the ftem ; the ftem itfelf is gibbous on the fide 

 oppofite the branches ; the branches lean all one way. This 

 is found in moll European feas, and in the Mediterranean ; 

 it is about three inches long, is pale and horny ; the ftem is 

 rather angular, with arched protuberances oppofite the 

 branches ; the denticles are feated in a focket furnifhed with 

 a (hort fpine on the lower part. 



HvPNOlDEs. Denticles pointing one way, campanulate, 

 toothed, and beaked ; ftems with pinnate branches, and very 

 crowded fubdivifions. It inhabits the Indian ocean, is fix 

 inches high; in colour it is brown, with yellowifli imbricate 

 radicles. 



Speciosa. Denticles campanulate, eflFufe, toothed, and 

 flipulate ; the ftem is pinnate, rigid, with incurved branches, 

 moitly pointing one way. It is found in the Indian ocean, 

 adhering to the tubular radicles of gorgoniae ; it is brown, 

 horny, and from three to four inches long. 



* Falcata. The denticles of this fpecies point all one 

 way ; they are imbricate and truncate ; the veficles are 

 ovate ; the branches are pinnate and alternate. There is a 

 variety of this fpecies defcribed by Ellis, in his work on 

 Corallines. It inhabits the European and Indian feas, and 

 is from three inches to a foot long ; the ftem is a little (lexu- 

 ous ; the denticles in a finglc row. 



* Pluma. In this the denticles point one way, they are 

 imbricate and campanulate ; the veficles are gibbous and 

 crelted ; the branches are pinnate, alternate, and lanceolate. 

 It is found on moll European coafts, climbing up fuci ; the 

 branches are jointed ; the denticles are ferrate at the margin, 

 and fupported in front by a fmall hollow fpine ; the vefi- 

 cles have a denticulate margin, and generally five oblique 

 crefted ribs. 



Echinata. Denticles oppofite, pointing one way, cam- 

 panulate ; the veficles are crefted ; the branches pinnate, al- 

 ternate, and lanceolate. It inhabits chiefly the ftiorcs of 

 Sweden, on fuci. 



* Antenni.na. The denticles are verticillate, in fours, 

 fetaceous ; veficles obliquely truncate, verticillate ; the 

 ttcms are generally fimplc. There is a variety which is 

 branched. They are botii found on the Britifli coafts, often 

 nearly a foot high ; it is yellow, with very fine capillary 

 yellowifli radicles ; the ftem is furrounded with fmall in- 

 curved letaceous branches, on the upper fides of which are 

 rows of fmall cup-ftiaped denticles ; the veficles are placed 



Vol. XXXII. 



on pedicles obliquely open towards the ftem, and placed 

 round it at the infertion of the branches. 



* Verticillata. The denticles in this are obfolete ; 

 the veficles campanulate, toothed round the rim, on long 

 twifted pedicles, and placed in fours round the ftem ; the 

 branches are alternate. It is found on the Britifti coafts ; 

 ftem ribbed, very loofely branched ; the denticles are not 

 vifible ; the veficles are nearly ^reft, and glutinous ; the 

 ovaries are oval, ending in a tubular mouth. 



Gelatinosa. Veficles campanulate ; ftem with nu- 

 merous decompofite fpreading branches. It is found on the 

 coafts of the Netherlands ; is half a foot long, and of a grey- 

 i(h-brown colour. 



* VoLUBiLis. The denticles in this are obfolete ; the 

 veficles are alternate, campanulate, toothed round the rim, 

 on long, twilled pedicles ; the branches are alternate. It 

 inhabits European feas, climbing up other fertulari^ ; it is 

 whitifti and minute ; the ftem is loofely branched ; the 

 ovaries are egg-fhaped and fmooth, or tranfverfely wrinkled. 



* Syringa. Denticles obfolete ; veficles cylindrical, 

 moftly alternate, and placed on fliort twifted pedicles. 



* Cuscata. Denticles obfolete ; veficles oval, axil- 

 lary ; branches oppofite and fimple. It is found in the 

 European feas, adhering to fuci. 



* PusTULOSA. Stem with alternate dichotomous branches, 

 obfoletely denticulate on the upper part. It inhabits the 

 ftiores of the Ifie of Wight, and is four inches long. The 

 ftem is fcen rifing into alternate dichotomous joints, with 

 fmall denticles, having a circular rim, with a point in the 

 middle of each towards the upper part of each joint. 



* Frutescens. Denticles cylindrical, campanulate, 

 placed in a fingle row on the infide of the branches ; the 

 branches are alternate, and pinnate. This is chiefly found 

 on the Britifli fliores ; rather hard, blackifti with brown 

 branches ; the ftem is compofcd of fmall united tubes. 



Pinaster. In this fpecies the denticles are oppofite, 

 felfile, with an incurved tubular tip ; the veficles are large, 

 ovate, quadrangular ; the angles terminating in a fpine, and 

 furniflicd with a tubular mouth in the centre, placed in a row 

 along the branches ; the branches aie alternate. 



Pennatula. The denticles in this are in a fingle row, 

 crenate on the rim, and fupported by a flender, truncate, in- 

 curved horn ; the branches are oppofite. It is found in the 

 Indian ocean ; is five or fix inches long ; yellowifh-brown ; 

 the denticles have two oppofite fpines on the rim. 



* FiLicuLA. Denticles oppofite, ovate, with a finglc 

 ercft one at the junttures of the branches ; veficles obovate, 

 with a tubular mouth in the centre ; the ftem is zig-zag, with 

 alternate branches. It inhabits the Britilh fliores, is very 

 tender, and the ftem is much branched. 



QuADRiDENTATA. Denticles in fours, oppofite, at the 

 joints of the ftem ; the ftem is fimple, with the joints taper- 

 ing and twifted towards the bafe. It inhabits the African 

 fliores on the Fucus Icndigerus. 



Spicata. Denticles in tliree, cylindrical, terminal, and 

 nearly clofed at the mouth ; veficles ovate, axillary ; ftem 

 tubular, panicled, annulate, with trichotomous branches dif- 

 pofed in whorls round the rings. 



* EvANsn. The denticles arc fliort and oppofite ; the 

 veficles are lobed, arifing from the branches which are op- 

 pofite. It inhabits the Britifli coafts, and is found on fuci : 

 it is two inches high, very flender, and yellow, with fulvouj 

 veficles. 



* MunicATA. The denticles of this fpecies are pedi- 

 clcd, proceeding alternately from thrjoints of the branches ; 

 veficles oval, Ipinous ; the ftem is jointed. It is found 

 oil the fliores of Scotland ; the veficles arc nearly globular, 



S f placed 



