HYIiIMUI) ZOOPHYTKS 83 



1'IX 'IMITlnN n|- THK I'l.ATKS 



KEY TO THE LETTERING OF THE PLATES. 







ae., acrocyst ; bl., blastoctylc ; ej>., chitinoiu pellicle ; d., dactylozooid ; gph., gonophure ; gift., gonotheca ; 

 yt., gBStrosooid ; kr., hydrocunlus ; hrh., hydrorhiza ; AM., hydrotheca ; hyd., hydranth ; 

 M., nianubriiiiii ; /'., node ; j>/i., ncmatophorc ; "/-.. opcrcnlum ; <"'., ovum ; p., jierisarc ; 

 ihf., rbisocanlns ; */., sperm ; i<.r., sub-umbrella cavity ; /., tentacle ; M., umbrella ; :., zooid. 



PLATE I. 



Fio. 1 . Perigonimiit antarftifta growing on Halfium arboreum ( x 2). //. //., hydrocaiilus of 

 Hitltrium arbortum ; hyd., hydranth of Ptriyonimit* ; gph., gonophorc of Perujonimu*. 



Fio. 2. Pnigonimtu atitarctitiu <J ( x 20). lirli., hydrorhiza ; /., manubrium of gonophorc ; 

 /'., periiarc ; *p., sperm filling the 8nh-nnil>rella cavity ; u., umbrella wall. 



Fio. 8. Pirigotumut antaretirut 9 showing variability (due to contraction) of form of the hydranths 

 (X 20). kc., hydrocaolus; hrh., hydrorhiza; hyd., bydruntli ; m., mannbrium of conophorc ; 

 99., ova embedded in the ectoderm of the manubrium ; /<.., iul>-nml>rc)la cavity ; //.. umbrella wall. 



FIR. 4. Eiultndritim iiuignt. Hydranth (x :'><>) (, collar of deeply staining cclU ; /'.. pcrisarc. 



Fio. 5. Slylartit haltfU ( x 80). Outer region of colony growing on Haleciitm arboreitm ; d., dacty- 

 lozooid ; he. If., hydrocauliLs of ffttlrciiim ; hrh., hydrorhiza ; gz., gastrozooid. 



Fio. 6. Stytafli* luilffu ( x 20). Central region of colony growing on Haltciiim arboreum ; hi, blasto- 

 style ; M.I., tentoculate blastugtyle ; gz., gartrozooid ; he. II., hydrocaultu of HaUfium \ hrh. P. & C. 

 hydrorhiza: of Perigonimttt and Campanularia. 



PLATE II. 



Fio. 7. Hydratlinia dtndritita cncrnsting Halfcium arboreum ( x 10). bl., blaslontylc ; gph., gonophorc ; 



gz., gastrozooid ; r.rjt., ridge-like spine. 

 Fio. 8. Hyilraftinia dendritira. Fragment of rhizocanlns ( X 20). bl., blastoctyles ; gph., gonophorc ; 



gz., gastrozooid ; rhr., rhizocanlos. 

 Fio. 9. HydroftiiiM dmdritiea (x 2). Young rhizocanline colony developing from the encrusting 



basal region ; me. r., encrusting region ; fr. rhr., free rhizocanli. 

 FIG. 9i. Hydrartinia dtndritia, encrusting Halteium arbor f urn (x 1). 



Fio. 10. Ifydroftitua dmdritica. Part of adnlt rhizocanline colony ( x 1). rht., rhizocanlus ; z., zooids. 

 Fio. 11. Tuliularia longtlaffi (*. 1). gph., gonophores ; hrh., bydrorhiza. 

 Fio. li. Tubvlaria rnlphi ( X 2). 

 Fio. 13. Tubularia hodgtoni (x 1). 

 Fio. 14. Lampra mierorhua (x 1). c.p., chitinous pellicle; gph., gonophores; hrh. f., liydmrliiz.il 



filament*. 



PLATE III. 



FIG. 15. Lampra pamila. Young zooid (x 10). dJ., distal tentacles; fir., hydrocaulus ; hrh. f., 

 byrdrorhizal filament ; hyd., bydranth ; /./., proximal tentacles ; PJ., polyzoan colony to which the 

 zooid it attached. 



VOL. m. 2 (J 



