HYDRO!!)* OK THK WOODS Hof.K RKOTON. 329 



Synceryaa mirabilis ( Ay. ). Fig. '.'. 



i fin-inn iiiinihillf Ajjassix. Cunt. Nut. Hist. I". S,, IV. p. 185.) 



r. Colony irregularly branching, without distinct hydrorhiza. Hydranths with terete 

 body and about lt> stout capitate tentacles. Perisare not annulated. 



<;,,unxntne. Mcdus;e borne on the hydranth body, with 4 radial canals and 4 marginal tentacles, 

 which are rudimentary and without evident eye-spots in the sessile medusae, and a very large proboscis 

 on which the sexual elements an; produced and east forth before the medu.se become free. The free 

 medussc are more hemispherical in shape and have fully developed tentacles with eye-spots on their 

 bases, and the proboscis is much smaller. 



< b/OT-.-^UuJwps rose-red owing to color of lining of body cavity. 



fHntrihutiim. Found attached to rocks, seaweed, and floating timbers (A. Agassi?.). Specimens 

 were found in both the II. S. Fisli Commission and Marine Biological Laboratories, but the labels did 

 not indicate the localities. Waquoit. ( Vinal Kd wards. ) 



CORYNITIS. 



Trr>)ili<>x<n:ii'. No evident perisarc. Colony consisting of single cylindrical hydranths with 

 spirally arranged capitate tentacles. 



(tintrmime. Gonophores on hydranth body producing medusa' with two tentacles which bear- 

 stalked batteries of ncmatocysts. 



Coryuitis agassizii McCrady. Figs. 4 and 80. 

 i I'riicoedings Elliott Suck'ty. vol. I. No. 1, p. 132.) 



Tm/iluixoini: Colony not branched. Hydranth with a long, cylindrical body and spirally 

 arranged capitate tentacles. 



Gommonif. Gonophores growing low down on the body of the hydranth. Medusa? almost 

 spherical, the surface dotted with clusters of nematocysts. Marginal tentacles 2 or 4, with swollen 

 bases and thickened ends. Ovaries on basal portion of the proboscis. Mouth lobed. 



Color. Medus;e with manubrium, eye-spots and ends of tentac.les red. Ovaries orange red. 



rHxIriliiillon. Found at Woods Hole. (Dr. Murbach.) 



I have not seen this species, but Dr. Murbach has kuidly allowed tracings to be iriade from his ' 

 drawings, to be used in this work. 



BOUGAINVILLIDjE. 



Tri>/iliimiinf. Colony branching (in our species) and with a distinct hydrocaulus. Ilydrantha 

 with a dome-shaped or conical proboscis, and a single whorl of rigid filiform tentacles. 



Gonomine. Gonophores borne on hydrocaulus below the hydranth body. (Never from the 

 hydrorhiza in our species.) Medusa with 4 radial canals. Marginal tentacles either single or in 

 clusters, with sense bodies at their bases. 



In iji'in'fii < if lliiin/iiiiii -il/itl;!' found in tlte Wiiorlx Hole region, 



Hydroeaulus with a strongly marked ohitinons perisarc. Medusse with clustered marginal tentacles and 



ramitk'd mouth tentacles ............................................................................... Sougmnrillia. 



Hydronuihis\vithagelatiiKius]iei-isiire. Medusar with asinglc marginal tentacle, and jio mouth tentacles.. Pm';/"" '''""" 



BOUGAINVILLIA. 



Troplwsomf.. Perisarc strongly marked, branched, and ending below the bases of the tentacles of 

 the hydranths. 



Gonosomr. Gonophores borne on pedicils springing from the hydrocaulus. Medusa; with 4 

 pairs of marginal tentacles when first set free, afterwards with 4 clusters of tentacles, each tentacle ' 

 with a black eye-spot above its base. 



Key to species of Bangui, irilliii fmmd in Hie Woods'Iffie region. 



Hydranths with small proboscis and 15 to 20 tentacles. Medusae with very broad proboscis ............. S. stipertiliaris. 



Hydranths with conspicuous conical proboscis. Medusae with a narrow proboscis ....................... B. carolinmsii. 



