llVDltolDS OK THE WOODS HObK KK<ilo\. 



PEBIGONIMUS. 



.. Colony attaining a height of about 1 inch, either branched or simple; perisarc of a 

 jelly-like consistency and reaching to the bases of the tentacles. Hydranth body terete, the proboscis 

 being large and conical. 



(iiniiixiinii: I loiiophoivs borne on the branches or hydranth bodies, in our species. Medusa; bell- 

 shaped, with a simple or lobcd proboscis. Marginal tentacles 2 or 4, not in clusters, and with bulbous 

 bases and no eye-spots. 



Perigonimus jonesi Osborn & Hargitt. Fig. (i. 

 (AmiTioln Naturalist, vol. xxvm. p. '27.) 



1'm/iliiixiiiiii'. Colony attaining a height of about one-fourth inch, freely branching, the branches 

 erect and continuing insensibly into the hydranth body; gelatinous perisarc very thick and often 

 wrinkled, reaching to the bases of the tt-sitacles, and sometimes appearing to include the proximal 

 part of the latter. Ilydranths with about 1(1 tentacles held rigidly, but alternately depressed and 

 elevated; proboscis dome-shaped or snbconical. 



GonOMnnr. (ionophoros borne' on the hydranth body or branches. Medusa! ovoid, with 2 

 tentacles, 4 radial canals, and 4 eye-spots; rnanubrium short with a 4-lobed mouth. 



Co/or. Colony flesh-colored. 



I>ixtrilnitiii. Found on the abdomen and walking legs of Luliinin > imirffhiata. Collected at 

 Coldspring Harbor, Long Island. 



This species does not come strictly within the Woods Hole region, but as it is the only American 

 Peri(/iiiiiiiiiin vet dcscrilx'd it. seemed desirable to include it here. 



7. Kiidrinlritiiii tm HUSHM Linn. A. Hydranth bearing female gonopnorea 



- 



EUDENDRID^E. 



Trophosome. Colony branching, often profusely; perisarc evident, often regularly annulated. 

 Hydranths with a single verticil of filiform tentacles, and a proboscis that is at times trumpet-shaped 

 and at times hemispherical, the 'distal end being the larger. 



Gonosome. Gonophores (male) forming verticils just beneath the tentacles of the hydranth, each 

 verticil being composed of a number of gonophores radiating like the spokes of a wheel, each gono- 

 phore having 2 to 4 chambers in linear series; female gonophores not in regular verticils, and usually 

 clustered around the hydranth bodies. No medusae. 



