334 



BULLETIN OF THK UNITED STATES FISH COMMISSION. 



Ettdendrium capillare Alder. 

 (Catalogue of the Zoophytes of Northumberland and Durham, p. 105.) 



Trophosoine. Colony attaining a height of about one-half inch, sparsely branching, the branches 

 and pedicila being sparingly annulated. Hydranth body vasiform. 



< iononome. Male gonophores 2 or 3 chambered, borne on aborted hydranths springing either from 

 the branches or hydrorhiza. Female gonophores also borne on aborted hydranths. 



Color. Bydranths pale greenish. Male gonophores orange. 

 R. I., in shallow water. (C. C. N.) 



11. J-lttdcndi-iitm album Nutting. A."_Hydfanth with male gonophores. 



Eudendrium album Nutting. Fig. 11. 

 (Annals and Magazine of Natural History, May, 1898, p. 362.) 



Tropliozome, Colony minute, attaining a height of about one-third inch, branching in a strag- 

 gling manner, the ultimate branches or pedicils being exceedingly long and slender, pellucid, and not 

 decidedly or regularly annulated. Hydranths with vasiform bodies. 



Gonosomc. Male gonophores 2 or 3 chambered, borne on hydranths that are generally not 

 aborted, but may be considerably reduced in size. Female gonophores apparently not so numerous as 

 in allied species, borne on partially aborted hydranths. 



Color. General color white, hydranths almost entirely so. Male gonophores pale orange yellow. 



Distribution. Found on floating seaweed secured in taking the tow at Woods Hole; also on U. S. 

 Fish Commission wharf. 



HYDRACTINID^E. 



Trophoeome. Colony formed of "persons" of three sorts springing from an incrusting layer 

 beset with jagged spines. Perisarc not evident. Hydranths with a single whorl of filiform tentacles 

 and a conical proboscis. "Spiral zooids" or defensive persons slender, cylindrical, spirally coiled, 

 with large nematocyst batteries near their distal ends. 



Gonosome. Gonophores fixed sporosacs borne on blastostyles, forming a thin! or sexual person of 

 the colony. 



HYDBACTINIA. 



CharactiTH of the family us 



above.' 



