NO. 1 fraser: hydroids 21 



Family Hydractinidae 



Genus HYDRAGTINIA 



Hydractinia carolinae Fraser 



Hydr actinia carolinae Fraser^ Beaufort Hyd., 1912, p. 351. 



Distribution. — South Viradores Islands, 8-10 fathoms; Tangola- 

 Tangola, 15-20 fathoms. 



Hydractinia disjuncta, new species 

 Plate 4, Fig. 16 



Trophosome. — Nutritive zooids small, with 10-12 tentacles, scat- 

 tered over the surface of a gastropod shell, inhabited by a hermit crab. 



Gonosome. — Female generative zooids much smaller than the nutri- 

 tive, with the tentacles short and only four or five in number; sparsely 

 scattered throughout the colony. Sporosacs single or in pairs, opposite 

 (these may not be at the same stage of development), arising about 

 half way from the base to the tentacles; ova 6-8 in number. 



Male zooids not observed. 



Other zooids. — No dactylozooids or sensory zooids. The spines are 

 quite numerous; they may be almost as high as the generative zooids; 

 smooth, slightly curved to a blunt point. 



Distribution. — Jicarita Island, 30 fathoms; Port Culebra, 3-10 

 fathoms. 



Hydractinia epispongia, new species 

 Plate 4, Fig. 17 



Trophosome. — Colony growing over a dense calcareous sponge; 

 nutritive zooids small, the most extended 0.6 mm. long, with 7 or 8 

 tentacles. 



Gonosome. — Male generative zooids shorter and much more slender 

 than the nutritive; without tentacles but the distal end much swollen, 

 made up largely of batteries of nematocysts. Sporosacs of different sizes 

 appear on the basal half; sometimes these are distinctly pedicellate; up 

 to 5 in number. 



Female zooids were not observed. 



Other zooids. — Zooids like the generative zooids but without sporo- 

 sacs are numerous in some areas. Whether they, or any of them, remain 



