HYDROTIW OK TITE V, 



"659 



SERTULARID.^E. 



T:-:i;i!i<:n>iii<'. Ily.lrotlu' "e sessile, more or less ad:u\tt' to t:i" stem, tip.'! :irr:mg."l on both sides of 

 tne - i-.uiHies. llvdranihs with conical pr.ibosei- anil a single whorl of lilimvni tentacles. 



Gonoxome, Son '>': planuKe. Xo medus;e. 



i-i< ';/' 



, -ill:, found in tin 1 \ViKnlt /In!'' 



.\. Hydrol'.i'.'c:]' in sirii'i!;. < : , ;i Kitr t<i c.u-h iiUrniin!' 1 m the - I'.MII or !>ran;-h. 



11. Opcl'culmn. v ', ' ,i pieces ................................................................... '//</ /arm. 



0,'. ' M'ei'cnlnm, when prc^'tit, in one piece imly ............................................................... Diiiln'tin. 



A'. Hydrothec D, subopposlto, usually ih-rjily Immenied more iiiMi: two in c.ii'li jciint ufstcni en- hnmch .......... Timim-in. 



A". Hyilrnt!K;i';v >' riri!>* ;iMrrn : 



a. Hydrotheceffi placed on oppo tte sides of Htexn ^n 1 ' branches ............................................. .svr/^ ' 



(f'. Hyilriitilrr:i; |il:'.l-r ! oil lilc UMIlt ill' hrilllclK-^ lillil rlir\-|Ml ^llrniMU'l;' iii ;hr ri\:!l! mill icfi ............ ii't'ilnt'tiu'ii, '<'. 



8EETULARIA. 



Ti-i>i>inKiinii: ( 'olony usually lininchcd; stfinsand lirandus iliviilcd into reiriilar intennxles, each 

 of \vliich bears a pair of -triclly o|i|Hisite liyilrothce.-i-. Hydrothecffl either witliout an operculnni or 

 with a very dclie-.it.- one eniniiosi'ii of two pieces. 



<iiin(jxn,ii<'. ' ionaniria without an internal marsupium. 



Key in tpeciet of Serttda/ria found in ///<' \\'n<ni.-< lll< ni/ii/u. 



A. The two hydrothecffi comporing a pair ^I'iircrly ti niching each other in front .................................. N. p u mil" 



\'. The two hydrotheeii' in contact inrat leust llalf their lenj;l!i. 



a. The width of a pair of liy.Iroiliccic at ;hcir IKI.M/S considerably less than di.-tancc from iKittoin of 



liydrot'ieca- !o ill" iiMil,> ^clow ................................................................ S. cni'iiiclnn , 



a'. The widtli ol" a pair of iiy-lrot!ici-:i' a! their bases not in ltd] less than distance from bolt out of hydro- 



ther;c to the node below ...................................................................... >'. COmpiatt, 



Sertxilaria pumila Linn. Fi,u'. ">"i. 

 (Syst. Nat., p. l::oii. ) 



Trophosome. C'olony final 1, branehed 

 or unbraneht'd; stem divided into regu- 

 lar internoiles, each bearing a pair of 

 hydrotheca?. Hydrotheeie slotil, rc<ru- 

 larly curved, the approximated sides of a 

 pair not in contact; aperture bilabiate, 

 often showing a very delicate Operculnm 

 composed of two valves. 



< niiiiiKoiiii'. ( Jonangia ovate, witli a 

 short pedicel and a terminal collar con- 

 taining the aperture. 



Dixtrilititioii. Rather common in the 

 Woods Hole region in shallow water. 

 Often found growing over seaweed. 



i i/utuilu Linn. 

 A. side view oi branch bearinggenangimn. 



Sertularia cornicina (McCr. ). Fig. 5fi. 



(It: inn, a mi diriiii-iiin Mct'r., (iyuinophthalinata of Charleston Hurlxir, p. 20-1.) 



ii'. Colony usually of a single upright stem not over half an inch high. Hydrothecse 

 more slender than in ,s'. piniiilii and the pairs are in contact for a considerable part of their contiguous 

 sides. Colony almost invariably overgrown by a campanularian (HebcUn rrtlearattt) which the original 

 describer took to be a part of the sertularian, the campanularian disposing its curved tubular hydro- 

 thecse symmetrically in pairs above the pairs of hydrothecfe of the sertularian. 

 Gonosomc. Unknown. 



l)i*li-iltiith>i.Vmcy&n\ Round, 8 fathoms on Halecium gracile, and on Xontern (Verrill). My 

 specimens were sent by Mr. \Vahnsley to Professor Osborn, of Hamline University, lalieled "S. pumila." 



gene 



i A satisfactory classification of this ijrmvp is still to be devised. The one adopted here will do fairly well for the 

 ra and species in the territory under consideration, but would be unsatisfactory it applied to the Sertularidsc in general. 



