14t) AMERICAN HYDKOIJDS. 



PLATE V. 



FIG. 1. Srrlulnrin iiini/i ri Nutting. P.asai portion of colony (enlarged). 



'2. Sii-inlnrin mayeri. Distal part of stem (enlarged). 



3. Ki'rliilnria nini/i'ri. Side view of stein (enlarged). 



4. XrrtiiUtrin nint/ri'i. Hydrothecie \vitli collapsible tiilnilar extensions ( en larked). 



5. Sertularia pourtalesi Nutting. Part of stem (enlarged). 



II. Si-rlnlnrin aliHil.-1-i/i Nutting. Part of stem anil gonanginm (enlarged). 



7. ^rtnlarin xtnuki'i/i. Pair of hydrothecse (greatly enlarged). 



PLATE VI. 



FIG. 1. >V( r/nlnrin hrrrici/ntlnix Yersliiys. I 'art .of stem (enlarged). 



2. Srrlitlnrin lii-rrii-i/nllinx. Side view of stem (enlarged). 



:!. ,\'i-ln!ni-in jinn -i -i:ii Nutting. Part of stein (enlarged). 



4. H-rliilnriaJInirrrsi. Side view of stem (enlarged) 



5. Si'i-lnlnrin liniiiiln Alhnan. Pair c>f hy(lrcithec:e (enlarged). (After Allman.) 



6. Sarttiluriii c.riijnii Alhnan. Pair of hydrotheciu (enlarged). (After Allman. ) 



PI.ATK VII. 



FIG. 1. Tlmumii tlmja (Limiieus) . Part uf lirani'li (enlarged). 



2. Thuiarin llmjii. Two hydruthei-.-e (greatly enlarged). 



3. TJniuir'ni lli'iju. Single hydrotheca (greatly enlarged). 



4. Tliniin-iii I'/i'i/iuix Kirchenpauer. Part of branch (enlarged). (After Kirchenpauer. ) 



5. Thiii, ir'ni i-uliiixtii. C'lark. Side view of branch (enlarged). 



6. Tliiiiitri/i i-tiliiixlii. Front view of branch (enlarged). 



7. Thuiarin rnlniKln. Part of branch with gonangia (enlarged). 



PLATE VIII. 



FIG. 1. Tliniariit tliiiiiiriniili'x (Clark). Part of stem, showing branch origin (enlarged). 



2. Tliiiinrin Iliiiiiii-iniili'x. Pair of hydrothec:r (greatly enlarged). 



3. Tlmiarin Ihiiiariwilca. Single hydrotheea, showing operculum (greatly enlarged). 



4. Tluiiariu tliniiiriuiili-it. Part of branch (enlarged). 



5. (i. Tliiiinrin tliniiiri/iiili'x. Gonangia (enlarge<l). 



7. Tliiiitii'!ii.]Hih/i-iii'jHi (Kirchenpauer). Part of stem, showing branch origin (enlarged). 



8. Thuiaria polycarpa. Part of branch (enlarged). 



9. TlinidriiijHili/nirjin. Siile view of two hydrotliee:e (enlarged). 



PLATE IX. 



FIG. 1. Tliiiinrin kiiril.r (Pieppig). Part of branch (enlarged). 



2. Tliiiinrin kurihi'. Single hydrotheea, showing margin (greatly enlarged). 



3. Tliiiinrin ininti'rsii Nutting. Part of branch '(enlarged ). 



4. T/ininrin iiiiuti'rsn. Hydrotheea! (greatly enlarged). 



5. Tliiiinrin Iniirtiitis ( P'llis and Solander) . Part of branch with gonangia (enlarged). 



6. 7, 8. Thuinrin /unrliilix. llydrothec;e, showing variation on margin (greatly enlarged). 

 9. Tliiiinrin /ilumtilifira Allman. Part of branch (enlarged). 



10. Tliiiinrin /iliimnlifrrn. Part of another colony (enlarged). 



11. Tlininrin /i/n uiiili/'irn. Part of main stem, showing branch origin (enlarged). 



12. 13. Thuiaria plumulif era. Ilydrothecie, showing margin (greatly enlarged). 



PLATE X. 



FIG. 1. Thtiariadiffu.ua. (Allman). Part of branch (enlarged). 



2. Thuinrin ilifftiKit. Two hydrothecie (greatly enlarged). 



3. Thuinrin i/ift'iiKii. Single hydrotheea (greatly enlarged). 



4. Tlininrin ilnl/i Nutting. Part of branch (enlarged). 



5. Tlininrin ilnlli. Part of stem, showing branch origin (enlarged). 



6. Thuiarin ilalli. Two hydrothec:e (greatly enlarged ). 



7. Thuinrin xiniilix (Clark). Part of colony with gonangium (enlarged). 



8. Tlininrin xiiiiili.t. Hydrotheea/ (greatly enlarged ). 



\i. Tlitiinrin Kimi/ix. Four hydrntheca- (greatly enlarged). 



