SERTULARIA. 



placed on pedicles, and full of pointed fpines from crafted 

 ribs. 



Secundaria. Denticles in a fingle row, campanulate ; 

 the velicles are axillary ; the ftem is minute, white, and in- 

 curved. This fpecies is found in the Mediterranean : 

 it is fcarcely three lines high, and not thicker than a fine 

 bnftle. 



MisENEXSls. The denticles are alternate, very thin, 

 fpreading ; the veficles are oval, peduncles axillary ; Item 

 much branclied, dichotomous. It inhabits the Mediter- 

 ranean, is very flender, pellucid toa-ards the tip, and fome- 

 times covered with the Cancer linearis. 



RacemosA. Denticles fcattered, pellucid ; veficles 

 cluftered ; ftem ftraight, round ; opaque, horny, with (lightly 

 curved branches. It inhabits the Mediterranean. 



* UvA. Denticles obfolete ; veficles ovate, cluftered ; 

 ftem (lightly branched, with alternate fubdivifions. It in- 

 habits the (hores of this country and Holland, adhering 

 to other zoophytes ; veficles tranfparent, with a white 

 nucleus. 



* Lendigeha. Denticles obfolete ; veficles cylindrical, 

 arranged in a fingle row along tiie branches, and growing 

 gradually lefs towards the top : the ftem and branches arc 

 jointed. This is found on the European coafts, on other 

 zoophytes. The branches are fubdivided and irregularly 

 interwoven ; the veficles are placed in parallel ranks along 

 the infide of the branches, and growing gradually fliorter to- 

 wards the top of the joints. 



* Geniculata. Denticles alternate, twitted ; veficles 

 obovate, with a tubular mouth in the centre ; the ftem is 

 branched, jointed, flexuous. It inhabits the European 

 coafts, adhering to fuci. 



* DicHOTOMA. Denticles obfolete ; veficles obovate and 

 axillary, on twifted pedicles ; the ftem is dichotomous, with 

 twifted joints. It inhabits the Britifti and Dutch coafts, and 

 is nearly a foot long ; it is white, but becomes teftaceous 

 with age. 



* Spinosa. Denticles obfolete ; veficles ovate, fubulate ; 

 the branches are dichotomous and fpinous. It is found on 

 moft European coafts, as well as on thofe of this country, 

 and is about eight inches long. The ftem is compofed of 

 interwoven tubular fibres ; the branches are flexuous, loofe, 

 forked, with pointed tips. 



* Pinnata. The denticles of this fpecies are obfolete ; 

 the veficles are oblong, and furrounded with a coronet of 

 tubercles at the rim ; ftem fimple, pinnate, and lanceolate. 

 It is found in Europe and in India, and is about three inches 

 high. The ftem is fimple, with alternate fubdivifions ; the 

 veficles are placed in clufters round the ftem. 



* Setacea. Denticles obfolete, remote, placed in a 

 row on the upper fide of the branches ; veficles oblong, ax- 

 illary ; the ftem is fimple, with alternate bent divifions. It 

 inhabits the European coafts, and is about an inch and 

 half high. 



* PoLYZONiAS. Denticles alternate, (lightly toothed ; 

 veficles obovate, tranfvcrfely wrinkled ; the ftem is loofe, 

 branched. It inhabits moll feas, adhering to marine fub- 

 ftances. 



Pennari.\. The denticles are placed in a row on one 

 fide the branches ; the veficles are oval ; the ftem is twifted, 

 and doubly pinnate. It inhabits the Mediterranean fea, 

 growing in tufts on rocks ; the ftem is ftraight, afcending, 

 flexile, horny, brown with whitifh branches. 



* LicHENASTRUM. Denticles alternate, obtufe, in two 

 imbricate rows along the ftem ; the veficles are ovate, in two 

 parallel rows along the branches ; the ftem is fimple, alter- 

 mately pinnate. It is found in the Irilh, Indian, Aiiatic, and 



Armenian feas. The ftem is ereft, jointed, comprefTed, and 

 denticulate ; the branches are alternate, denticulate, and 

 ftraight. 



Cedrina. Denticles fubcylindrical, tubular, in four 

 imbricate rows ; the branches arc irregular, quadrangular, 

 and thicker upwards. Inhabits the ieas of Kamtfchatka ; 

 the branches are dichotomous, obtufe, with four rows of 

 veficles. 



* Imbric.\ta. The veficles of this fpecies are fubcla- 

 vate, irregularly imbricate upwards ; the ftem is (lightly 

 branched. This fpecies is defcribed and figured in the jth 

 vol. of the Linnsan Tran factions. It inhabits the weltem 

 coaft of Britain, on the Fucus nodofus ; it very much re- 

 fembles the laft, but the veficles are not placed in any re- 

 gular feries ; it is about three inches high ; the (mailer 

 branches have the veficles placed bifarioufly, but towards 

 the tip they become imbricate. 



Purpurea. Denticles fubovate, tubular, in four im- 

 bricate rows ; the veficles are ereft and campanulate ; the 

 branches arc dichotomous and fquare. It inhabits the fea 

 round Kamtfchatka, and is of a blacki(h-purple. 



Articulat.v. Denticles prcfted together ; the veficle* 

 are ovate, rather large, covered with a lid, and placed in a 

 fingle row ; the ftem is jointed and pinnate. It is found 

 in the Atlantic ocean, creeping on (hells, and is about two 

 inches long ; pale yellow. 



Filicina. Denticles imbricate, placed on one fide only ; 

 veficles jointed ; ftem granulate, branched and pinnate, the 

 fubdivifions alternate. It inhabits the Indian ocean, is pale, 

 and about three inches long. 



Fruticaks. The denticles of this fpecies are in a fingle 

 row on one fide ; femi-campanulate ; the ftem is granulate, 

 woody, with alternate fetaceous fubdivifions. It inhabits 

 the American feas in tufts, on (hells ; it is fix inches long, 

 and of a yellowi(h-grey. 



B. The fpecies of this dlvlfton have a cruflacmus flem, inclining 

 tojlone, and compofed of rows of cells ; they have no -vejicks, 

 but in the place of thefe there are fmall globules . 



* BuRS-ARLii. Denticles oppofite, compreded and trun- 

 cate ; the ftem is branched, and dichotom.ous. It is found 

 on the Britilh coafts, adhering to fuci ; it is minute, flexile, 

 hyaline ; the denticles are carinate, with a fmall clavate tube 

 at the top. 



* Loriculata. Denticles oppofite, obliquely truncate, 

 and nearly obfolete ; the branches are ereft and dichotomous. 

 It inhabits the Britilh coafts, on old fertularii. 



* Fastigiata. Denticles alternate, pointed ; branches 

 dichotomous, ereft. This is found in the Britilh feas ; the 

 denticles are marked with a black fpot in the middle. 



* Aricularia. The denticles all point one way, nearly 

 oppofite, and furnilhed with two mucroiiate appendages ; 

 the globules appendaged ; the ftem is branched and dicho- 

 tomous. It is found in the European leas ; is from one to 

 two inches long ; in colour it is of a dirty grey. It is very 

 brittle. 



* Neritina. The denticles are alternate, acute, and 

 pointing one way ; the branches are dichotomous, unequal, 

 and ftraight. It is found m the European and American 

 feas. It is foft ; the globules have an opening furrounded 

 by a dark-coloured margin. 



* ScRurosA. Denticles alternate, angular, fpinous ; the 

 branches are dichotomous and creeping. It inhabits moft 

 feas ; is very brittle, linear, and pale, with a double row of 

 cells. 



PiLosA. The denticles are alternate, oblique, with a 

 long mouth ; the branches are dichotomous, faftigiate, and 



llrong. 



