44-J lil'U.KTl.N UK THK LIMITED STATES FISH COMMISSION. 



^ e !l j'urji/eit/ijii-uti'jii </; ' 'ampanutaridte found in Wood* Hole, 'region (based on trophosome alone). 



\. Sloni neither re imlnrly branched nor fascicled. This includes cases where a pedicel supports other pedicels springing 



from it in an irregular manner, 

 u. Pedicels siron.uly tmnulated throughout. 



b. Hydrothecal margin not toothed, but entire Campamitaria, poteritim 



b'. Hydrotheeal margin evidently toothed. 



e. Hydrotheca: small, tubular. Teeth very shallow ClytinvolubUii. 



*'. Tcet h sharp, deeply cut. Hydrotheca: .small, with a tendency to irregular branching. . Campatiularia laznuta. 

 a'. Pedicels not strongly annulated except at ends, 

 l<. Hydrothceal teeth squared off at ends. 



Hydrotheeae ornu mented with vertical 1 incs Campanularia Itiiickiii. 



b'. Hydrothecal teeth evenly rounded. Hydrothecae very large, with parallel sides and exceed- 

 ingly thin walls Clytia yrayi. 



li". Hydrothecal teeth sharply pointed, the extreme tips sometimes rounded. 



c. Pediet-ls usually more than three times the length of hydrothecae. Hydrothecae deeply 



campanulate Clytia bicop/iora. 



!'. i-cdicels seldom more than three times the length of hydrotheca:. 



d. Hydrothec;e broad, often subtriaugular in outline Clytia nolifonais. 



(/'. Hydrothec;e deep, cylindrical '. Clytia cylmdr'uxt. 



A'. Stein regularly branched. 

 ti. Stem fascicled. 



b. Hydrothec;e with pointed or regularly rounded teeth. Pedicels arranged in verticils around 



Mem Campamilaria verticitlata. 



b' . Hydrothecae with very shallow evenly rounded teeth. Colony with subverticillate branches. . Obelia Imiffiesima, 

 b". Hydrothcca? with square, or bimucrunate teeth. 



c. Hydrotheca: ornamented with vertical lines or longitudinal ridges. 



tf. Hydrothecae very deep, tubular. Pedicels with more than (i annulationa Obelia biaiKpid,ata. 



it'. Hydrotheeienot so deep. Pedicels with usually 3 to annulations Obelia bldf.nt.aia. 



f. f . Hydrothecae without evident longitudinal lines ..Obelia gelatinosa. 



a'. Stem not regularly fascicled. 1 

 a. Hydrothecal margin toothed. 



b. Pedicels usually in pairs or subopposite Campanvlaria cdwardei. 



b'. Pedicels regularly alternate. 



c. Pedicels longer than hydrothecae, not completely annulated Campanularia ntgtecto. 



c'. Pedicels shorter than hydrotheca:. 



d. Aperture of hydrothecaa broader than middle part Gonothyrza tenuit. 



d f . Aperture scarcely broader than middle part G&nothyrxa loveni. 



a'. H ydrothecal margin even, not toothed. 



b. Colony with a very slender central stem, from which much-branched short lateral branches 

 arise in a verticillate manner. 



c. Hydrothecse triangular in outline. Pedicels usually with 4 to 6 annulations Obelia flabclfata . 



c'. Hydrotheca! deeper, subtriangular in outline. Pedicels usually with more than 6 annula- 

 tions Obelia eommitturalit. 



r". Hydrotheca: deeply campanulate. Pedicels often considerably longer than hydrothecae, 



and with their middle portions not annulated Campanularia amphora, 



bi. Colony not branched in a regularly verticillate manner. 



r. Stem nearly straight, branches strong, suberect, and giving off bushy branchlets. Hydro- 



i In <;!: very deep, campanulate. Pedicels very short Obelia dicfiotonia. 



c'. Stem strongly flcxuose. or geniculate, usually not profusely branched, and giving off alter- 

 nate pedicels. 

 '/. Stem flcxuose. Hydrotheeae deep, with slightly everted margins. Pedicels sometimes 



quite long, with middle portions not annulated Campawflaria valccolifcra. 



<r. Stem decidedly flexuose, each pedicel forming a graceful curve continuous with the 

 intornode from which it springs. Hydrothecae campanulate. Pedicels with ti to 



12 annulations Otmpannlaria fictuosa. 



<l". Stem gcniculate, or abruptly bent at the nodes. 



r. Pedicels long, with many annulations Campamilaria anfiulaia. 



r'. PediceN short, borne on broad processes from stem. Hydrothecas subtriangular. . . Obdia i/c 

 ,\". Colony parasitic, usually growing iti a straggling or irregular manner over other hydroidH. Hydrothecie 



tubular, with even margins. Pedicels very short, sometimes hardly apparent.. (Genus 

 n. Hydrothec:c large, curved. Colony almost always found growing symmetrically over ,^ci-ttilaria 



rnrn iff/in ffebella catcarata. 



', Hydrothecu' much smaller. Colony growing in a straggling manner over various hydroids and 



other organisms Il'brtla pitfiiii.rfi. 



1 An appearance "i liiM'ieiilationis often produced when a simple stem is overgrown with parasitic hydroids, oruveii 

 when young colonies are growing over oldw ones of the same fpccies. 



