148 AMERICAN HYDRO1DS. 



PLATE XVIII. 



Fir;. 1. Sertularella i.-m-lln (Alder). Part of colony (enlarged). 



1'. Nn-tiiltii-i-/li.t Irii, /In. F.nd nf hydrotheca, showing operculum (greatly enlarged). 



:;. H,i-ltil,i,;-/lii iilliniiiii Ilartlanb. Part of colony (enlarged). 



4, "). H-i-tiiliii-i-l/ii nHuKiiii. Ilydrotherae, showing margin and npercnlnm (greatly enlarged). 



li. Sertularella allmani. Gonangium (enlarged). 



7. S:-Hiiliii-i'/ln i;,ni, 11-1,1 Kirchenpauer. Part of branch (enlarged). 



8. Siiiiilnn-llu i-niilni-lu. Hydrntheca, slmwing margin lirreatly enlarged). 



9. Si-i-li'liirillii mull ii-ln. Gonangium (enlarged). 



10. ,sv -,-tiiliii -i-l/ii lulu (Male). Part nf branch (enlarged). 



PLATE XIX. 



FK;. 1. Xfi-tii/iti-i-/lii iilliii/,1 Kirchenpauer. Part of branch (enlarged). 



'2. N i-lii/in; /In iilliiiln. Branch with gouangium (much less enlarged). 



:;. s,'i-liiliii-i'lln j,ii iiiii/ii-it Hartlaub. Part nf branch, slmwing hydranths (enlarged). (After Allman.) 



4. K,-iin/in-,'U,i i-i/liiiiiri/liii-n I Allman ). Part nf branch (enlarged). (From Allman's type specimen.) 



:"i. Sii-liiliirilln ilixlimx (Allman). Part of branch (enlarged). 



li. Si'i-lnliii'i'llti ilixlimx. Two hydrothecae (greatly enlarged). 



7. X rln/iin -lln i/ii/iiiili-<i Mereschkowsky (slightly enlarged). (After Mereschknwsky.) 



PLATE XX. 



Fie. 1. Sertularella amphorif era Allman. Part of branch (enlarged). 



1'. Sertularella amphorifera. Knd nf hydrntheca (greatly enlarged). 



::. S,'i'liilin-,llii j'uxifiiniiix llincks (enlarged). (After llincks.) 



4. Sertularella Jusiformis. linnanginm (enlarged). (After Hincks. ) 



fi. SiTliiliri'Hn /lirln (Meyen). Part < if colony (enlarged). (After Meyen. ) 



(i. Sirlii/ni-i'/lii /lirln. Single hydrntheca I greatly enlarged I. (After Ilartlanb. ) 



7. Hi' ill i In i; Hi i jiii'lu. Part nf branch with gonangium (enlarged ). ( After Hartlaub. ) 



8. Si-rliiliri'lln iHi i i/ii.itiii/t<i Nutting. Part nf branch (enlarged I. 



!i. Xi-i-tii/iin-llii ini-ijnxliiniii. Part nf branch with gonangium (enlarged). 

 10, 1 1. Kn-ln'iii'i'/lii xnliliii-iii Nutting. Single hydrothecie (enlarged). 



PLATE XXI. 



FIG. 1. S,-rliiln;llii /i,i/i/:nninx ( Kills and Si dander I. Part nf branch (enlarged). 



i'. Sertularella polyzonias. Gonangium (enlarged). 



.'!. Si'iinlii-i'lln I'/imxii ( Allman ). Part of branch from Allman's. type (enlarged). 



4. Sirtiilun-lli i-liiiixn. IMK! nf liydrntlieca, slmwing npercnlnm, frnm Allman's type (greatly enlarged). 



,~i. \'i-lii/ni;'l/ii fiiiiijili'.i'ii Nutting. Part nf branch (enlarged), 



li. Si-fliiliii-i-lli i-iiiiiji/i i;i. Knd of hydrntheca, slmwing npercnlmn (greatly enlarged). 



7. Sertularella c.omplexa. Gonangium (enlarged). 



8. SI. Si-rtiilin-i-llii i-niii/i/i'i-ii. Gonangia viewed frnm abnve, slmwing teeth (enlarged I. 



10. Si'rlnlin-ill'i jiiiiiinlii ( 'lark. Part of colony with gonangia (enlarged I. 



11. N liii/iirrl/ii jiiiiniilii. Part nf branch, front view (enlarged). 

 IL'. Sertularella pinnata. Single hydrntheca (greatly enlarged). 



PLATE XXII. 



Fin. 1. Si-rliiliri-lln iiKtri/Ki-iiiiri'ii Allman. Part nf branch with gonangium (enlarged). (After Allman. ) 

 i'. Sii-iiilui 'I'llu lurijiili (Traskl. Part of colony with gonangium (enlarged). 

 :'.. x, i-iiiliri-llii tiinj'ulii. Distal part of branch (enlarged). 

 4,5. Sertularella Im-i/liln. Knds of hydrotheca?, showing teeth (greatly enlarged!. 



6. Sfrtnlnn'llii xii'laihli Kirchenpauer. Part of branch (enlarged). (After Kirchenpauer.) 



7. .s 1 . i-hi/in;llii xi,l,nlili. ( iouangium (enlarged). (After Kirchenpauer.) 



s. X. i-liiln; Hi Kiiliilii-liiiliiiiin Kirchenpauer. Part nf cnlnny, slmwing liranching (enlargedl. 



9. Sertularella milxHi'liiitniiiii. Hydrntheca, slmwing margin (greatly enlarged). 



10. Hi'i-iiiliin-llii subdichotama. I'-nd nf hy<lrntheca, slmwing nperculum (greatly enlarged). 

 11,11'. Xi-rliiln-i-llii xiilH<-liiitii;iin. (iiiuangia (enlarged). 



PLATE XXIII. 



Fi::. 1. Si'flnliirillii ji/ifiii'inix i Allman). Branch with gonangium, from Altaian's type specimen (enlarged). 

 I',.'!. K-i-liilni-fllii lilij'i' i-niix. IIydrnthec;r, frnm same specimen (greatly enlarged). 



4. Sertularella i/innli-ijiiln Ilartlaub. Part nf Allman's type nf Xi-rlu/nrid i/nmlriili'iix Allman (enlarged). 



5. Sertularella i/inn/i-ijiiln. Three hydrothecae frnm same specimen (greatly enlarged). 



li, 7. x,;-tiiliti;-/ln i]iiinli-(tiil,i. Hydrntliec.-r frnm same specimen, slmwing teeth and npercnla (greatly enlarged). 



8. H, i-iiiliii'i-lln nn-i-iiliiiiiii/i.-: Nutting. Part of branch with g<manginm (enlarged). 



Si. Ni i-lii/iii'i'l/H meridional-is. Single hydrntheca, slmwing teeth and n]iercnlum (enlarged). 



