THK SKRTULARHXE. 101 



Sertularia t, ;<.-/,;, I,,/,, ALDER, Trans. Tyneside Field Club, V, 1862, p. 289. 



Sertitliu-iit lri<-i(xjiiiliil<i I'A< KAKh, Canadian Naturalist, ISO",, j>. 4. 



Cotullini trii'iif/iiilnlii A. AHAS.SI/, North. Amer. Acalephae, 1st 15, p. Mil. 



Sertularella trimtfpidata HIM KS, Brit. Hydroid Xuoph.. isos, p. i>.",9. 



,\'i-/ii/,ii-i'//n /I'ii-iixji ;,ln/,i VKKKII.L. I'p.c. Am. Assn. Adv. Sci., 1*7."., pp. :!5"., .".59, 364. 



sjiidiitit KIKCIIENPAIICH, Xweite deiitsche Nordpolarfalirt, 1st 19-70, II, 1874, p. 416. 

 i-irtixjiiilntii HIXCKS, Ann. and Mag., 4th SIT., XIII, 1*74, ]p. 151. 

 Sertularelln trinixjiidula VKRRII.L, Am. Jour. Sci. and Arts, VII, 1874, p. 44. 

 Serlidarella tricusjiiduta LUTKEN, Arctic Manual, 1875, p. 190. 

 Kerliilni-iU<i ti-iriixjiiiliita CLARK, Alaskan Hydroids, Is70, p. -.4. 

 Sertulardla li-inixpii.ln/n SMITH and HARGER, Trans. Conn. A cad., Ill, 1876, p. 7. 

 Serlitliiri'lln li-ifiixjiidiila. HIXCKS, Ann. and Mag., 4th ser., XX, 1877, p. 07. 

 \riiiliii-illn ti-ii'iixjiiilatu NORMAN, Ann. and Mag., 5th SIT., I, 1878, p. 190. 

 Sertulardla trirtiK/iiiluttt MERESCHKOWSKY, Ann. and Mai;., 5th SIT., I, 1878, p. 323. 

 N / -lii/nri'1/ti Irii-tixjiiditln PTnuAX, Ann. and Mag., 5th ser., VI, 1880, p. 268. ' 

 Xn-lnlnn-lla triru.yidatii WINTHEH, Naturh. Tidsskr., (Hi, Nit, 1SSO, p. 270. 

 X i-hi/iinlln ti-ii-iixjiidittii RIDLEY, Ann. and Mag., 5th SIT., VII, 1SS1, p. 455. 

 Sertularella iricuspidata RATHBUN, Proc. U. S. Nat. Mus., lss3, p. L'lii. 



i ti-ii-tisjiiiliitu TnoMi'S'iN. I'.ijilragi'ii to .!< Dierkunde, Afl. X, 1884, p. 6. 

 l'i li-ii'iiiijiiiliilii KiRCHEXPAi-EU, Nordische (Jattungen, 1884, p. 45. 

 Sertularella paUida KIHI'IIEXI'AI'ER, Nordische Gattuzigen, lss4, p. 48. 

 Serluliinllii trifiixjiiiltita MTRDOCII, Polar Kxpcd. IViint liarmw. 1SS5, p. 16H. 

 N i'hil<ii'ctl<i ti-iruxjiiJuta LoHENZ, Die intern. Polarforschting, Jan Mayrn, III, 1886, p. 2. 

 SertulareUatrieuspidataTHOKPSOV, Vega Expedition, Vet. Jarktai:.. IV. lss7, p. :i!>4. 

 Sertnliiri'l/ii. trii-iixjiiil'ilri P.EUIIII, Groplepolyper fra Kara Havet. 1SS7, ]>. ,":>5. 



Serial i nil i trirttxjiiilntit MARKTAXXER-TfRXERETs-ciiER, Hydroiden aus den k. k. naturhist. Hofuuiseunis, 1890, p. 222. 

 Sertularella {rlcu.--pii.htla FEWKES, Bull. Kssex Inst., XXIII, 1891, p. 88. 

 Sertulin-illii ti-ii-iixjiiiliita LEVINSEX, Vid. Meddel. naturh. Foren., 1892, p. 59. 

 fii-rtiilnn-llit. triritsjiiilttta MARKTAXXER-TTRXERETSCIIER, Hydroiden von ost Spitzb., 1895, p. 425. 

 Sertularellii trifuxjiiilnln . J.VDERHOLM, Bihang svensk. Akad., XXI, 1896, p. 1-. 

 Sertularella tricusiiidata ROULE, Kiihler, Ri'sultats sr. ( 'anipagne du Caudan, Pt. 2, 1896, p. 301. 

 Sertuliinlln tririin/iiiliilii PEDASCHEXKO, Trav. Sor. Nat. St. I'edTsbourg, XXVIII, 1897, p. 226. 

 fjt'i-liiliii-t'l/ii . triciii'jiiiJiitii SINI/.IN, Arl>. '/.< HI]. Inst. Wai'M-hau, 1S9S, ]>. 1'1'S. 

 Sertularella tricuspidalu BIKTLA, Ann. Mus. I J etersbourg, ls98, p. 203. 

 Ki'i-tiiltiriltit triciixjii'lti/tt v. ADHLI'.M;, 7ncil. C'cntralblatt, 1899, p. 518. 

 Sertularella tricuspidata NI-TTIXH, Ilydmids from Alaska and Pugrt Sound, 1899, ]>. 741. 

 Sertulari'lln li-ii-ux/iidnln P.OXXEVIE, Norwegian North Atl. Kxped., 1899, ji. 78. 

 X,-itl<irfl/tt ti-iciif/iiiliil/i CAI.KIXS, Hydroids from I'lv.'ct Sound, 1*99, p. 360. 

 Sertularella trii-itxjii/lu/u THTET and BEDOT, Ilydraires de I'llirondelle, 1900, p. 222. 

 Seiiiiliiri'llit ti-iriifsjiidalu HARTI..M-H, Revision der Sertularella-Arten, 1900, p. 23. 

 Xt'i-hiliiri'l/it li-lfiix/iidnlii HARTLAFU, Ilydroiden aus di-in Stillcn Ocean, 1901, p. 354. 

 l-!i-i-lii!iiri'l/ii ti-iriixjiii/i/td NUTTING, Hydroids of the Woods Hole Region, 1901, p. 302. 

 injiiiliiiii Xi'TTixii, Harriman Expedition, the Hydroids, 1901, p. 183. 

 trii.-tisjiiilattt HAKGITT, Amer. Naturalist, 1901, p. 391. 

 Sertularella tricuspidata WIIITEAVES, Cat. Marine Invert. Eastern Canada, 1901, p. 20. 

 iVrrtiitiin-llii trlciix/iiiliitu S I:MI \nssn\-. I'.idra;.' til ICundskaben islandske Hyilroider, 1902, j>. 68. 

 Sertulitri-l/ii lii-Kjii-rii.i TORUKV, Hydroida of the I'acitic coa-t, 1902, ].. 63. 



Trophosome. Colony ;i nnittcd muss of shoots and twigs soinotimos sittaining 1 a height of 5 or 

 6 inches. Stem not fascicled, slender, divided into intcrnodc* carh of which hears a hydrotheca 

 or a branch with its axillary hydrotheca. Branches irregularly alternate, often branching 

 profusely either alternately or dichotomously, divided into regular internodes each of which 

 bears a hydrotheca, some of the nodes being double and oblique, which gives a twisted appear- 

 ance to the branch. IIydrothec:c distant, small, cylindrical, without corrugations, the distal half 

 or more being free; margin with three strong, equal and equidistant teeth: operculum composed 

 of four flaps. 



Gon-O80tne*Gcou8.ngiin borne profusely on the main stem and branches, laro-e. oblong-ovate, 

 marked throughout with very prominent compressed annular ridges, the uppermost of which 

 forms a bowl-shaped structure from the center of which arises the tubular neck which ends in a 

 slightly everted margin and ro.md aperture. 



Distribution. Abundant throughout the north polar and north temperate regions of the 

 world. New England coast (Verrill); Gulf of St. Lawrence (Dawson): Labrador (Packard); 



