EXPLANATION <)F PLATES. 



Unless otherwise indicated all uf the lignres iii thr i il all's \\ ere drawn by Mr-. Lilian Hulsebus Crone after origi- 

 nal camera luciila sketches from nature by Prof. ( '. ( '. Xi it ting. Where li'_'mvs were copied from tin- Works uf 1 her 

 authors tin' source is indicated, ami thr copies were mailf l>y Mrs. Crone. 



Tin- text figures illustrating tin- stem, liydranths, ami gonophmv,-. unless otherwise indicated, were drawn by 

 Mr. .1. II. I'aannaiin after camera lueida sketches liy the author. All nf the ntlirr texi figures were drawn hy Mr. 

 Paarmann with tlie aid of the camera lucida, except \vhen copies were made In. in other publications, in which case 

 Ihe sniirce is indicated in the exjilanatimi nf the ligurcs. 



I'I.VTK I. 



Kn;. 1. K' rln In riii /nnni/n Linn.-cus. I'nrtinn nf main stem and branches ( enlarged i. 



'2. ,^1-iiiiliii-in /iiniiilii. Side view nf branch, slinwin;,- :_'nnani;ium I enlarged I. 



3. Si-i-liiliiriii /nun iln. I 'air nf Imlrnthec.-e and expanded hydra ntli i greatly cnlarj.-' I ). 



4. Sertularia n-ivlui/x! Xutlin^'. I'nrtinn nf main stem and branches lenlanjeil ). 

 "i. Hfrtnliii'iii I't'ivliii/.ii. I'ai-t nf liranch (enlarged . 



II. Si-rlnliii-iii i-i'ivliiii.*!. P.ranch fmni aimther ccilmiy (cnlaruedi. 

 7, S. !l. S,-,'lnlni-ni 1-,'iv/ni/xi. Pairs of hydrotlie.'.'i- i greatly cnlarL'ed ). 



1'I.ATK 11. 



FK,. 1. Sertularia,. chattengeri Nutting. I'nrtiim nf siem and branches from Allman'a type of Demnoscyphus pectinalw 



. Mlmaii i. enlarged i . 



1'. Si'i-liiliiriii <'liti//i-iii/fi'i. I 'art nf branch from same specimen (greatly enlarged I. 

 :;. K'rtiiliii'iu ii/i,ri-iiliilii LiniKciis. I'nrtinn nf branch with gnnangiuin lenlargeil . 



4. Srrhilnrin n/>,-i-i-iiliiln. A pair nf hydrothec.-e (greatly enlarired I. 



5. Hi-1-lnliirin njii'ri'iil'ilii. Side view of hydrntheca (greatly enlarged i. 



(i. Sertularia pulchella id'Orbiguy). Portion of branch with L'onanginni (enlarged), i Lfter d'Orbigny.) 



7. Sfi'tnliiriii /mli'li, Iln. Part of branch with gnnangiuin (enlarged). (After Clarke's drawing of Serlularia 



fm-nitii Trask. i 



s. ,v, lin/m-iii liix/iiiHisii ((irayi. '"art of branch (enlarged). 



0. Si-rlnlnriii liiitjiiiKiiai. Pair of hydrothec;r (greatly enlarged). 



10. Si-rliiliirin l>!x/i!iiint. Side view nf branch (enlarged). 



11. &i-ltiliii-i,i liix/iiiinxii. Side view of hydrntheca ( u'reatly enlarged ). 



PI.ATU III. 



FK;. I. Sertularia desmoides Torrey. Part of branch i enlarged i. 



L'. Si-rliilitrin ili'xiiiniili-x. Pair nf hydrnthecie I'jreatly enlarged I. 



3. Xi'i-lii/in-iii ili'xiiiiiiili 1 *. Knd of hydrotheca, showing a]ierlure iL'i'eatly enlar.'edK 



4. .^'rln/iiriii i-iillilmni Nnlting. I'nrtinn of branch i cnlar.-cd I. 



5. Ki-rliiliirin rnllilmiii. Pair of liydrotlieca- (greatly enlaru'cd i. 



I), 7. Sri-hiliiriii riilliliinii. Lateral views of hydrothec.-r, slm\vin : _. tridentale margin- ii;really i-nlarircd ). 

 s,;i. Si'i-liiliii-!ii i-iillilmii!. Two other \ie\\s nf mar.'ins i. irreatly enlaru'i-di. 

 In. SiTtnltir'ni ,/nifilix Hilicks. Part nf branch with gnnangiuin (enlarLrcd). 



PI.ATI. IV. 



Kn.. I. Xir/ii/i iriii I'lirniriiiii \ Mel 'ready ). Cnlnny with gnnan^'ia and expanded hydranlhs. Drawn Inun 



(enlarged |. 

 L'. Si'rtiiliiriii riiriiiriiin. Pair of hydrntlicc.-c i^'reatlv enlaru'cd ). 



:i. Sertularia carnicina. Gonangium (enlarged). 



4. H'rtiilitriii corntcina. Side view of colony with parasitic campanularian and its gonangium i enlaiv 



."i. Sertularia comidna. Pan of same colony i enlarged i. 



l \5 



