HYDKOIDS OF THE WOODS HOLE REGION. 
329 
Color. — Hydranths rose-red owing to color of lining of body cavity. 
Distribution. — Found attached to rocks, seaweed, and floating timbers (A. Agassiz). Specimens 
were found in both the U. S. Fish Commission and Marine Biological Laboratories, but the labels did 
not indicate the localities. Waquoit. (Yinal Edwards. ) 1 
CORYNITIS. 
Tropliosome. — No evident perisarc. Colony consisting of single cylindrical hydranths with 
spirally arranged capitate tentacles. 
Gonosome. — Gonophores on liydranth body producing medusae with two 
tentacles which bear stalked batteries of nematocysts. 
Corynitis agassizii McCrady. Figs. 4 and 79. 
(Proceedings Elliott Society, vol. I, No. 1, p. 132.) 
Tropliosome. — Colony not branched. Hydranth with a long, cylindrical 
body and spirally arranged capitate tentacles. 
Gonosome. — Gonophores growing low down on the body of the hydranth. 
Medusae 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. — Medusa; with manubrium, eye-spots and ends of tentacles red. 
Ovaries orange red. 
Distribution. — Found at Woods Hole. (Dr. Murbach.) 
I have not seen this species, but Dr. Murbach has kindly allowed tracings 
to be made from his drawings, to be used in this work. 
BOUGAINVILLIDHL 
Tropliosome. — Colon}' branching (in our species) and with a distinct hydro- 
caulus. Hydranths with a dome-shaped or conical proboscis, and a single 
whorl of rigid filiform tentacles. 
Gonosome. — 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. 
4. Corynitis agassizii McCr. 
(After Murbach.) 
Key to genera of Bougainvillidse found in the Woods Hole region. 
Hydrocaulus with a strongly marked chitinous perisarc. Medusae with clustered marginal tentacles and 
ramified mouth tentacles Bougainvillia. 
Hydrocaulus with a gelatinous perisarc. Medusse with a single marginal tentacle and no mouth tentacles ..Perigonimus. 
BOUGAINVILLIA. 
Tropliosome. — Perisarc strongly marked, branched, and ending below the bases of the tentacles of 
the hydranths. 
Gonosome. — Gonophores borne on pedicels springing from the hydrocaulus. Medusae 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 Bougainvillia found in the Woods Hole region. 
Hydranths with small proboscis and 15 to 20 tentacles. Medusse with very broad proboscis It. super ciliar is. 
Hydranths with conspicuous conical proboscis. Medusse with a narrow proboscis B. carolinensis. 
1 Since the above was written this species has been found in abundance growing on the piles of the U. S. P. C. wharf at 
Woods Hole. 
