330 



Hl'l.l.KTl.N OK THK I'NITKD STATKS K'ISH COMMISSION. 



t'liiiiiisoiiu: Gonophores borne on shorter hydranths just below the tentacles and producing free 

 meduste with 4 radial canals, 8 rudimentary tentacles, and neither mouth nor eye-spots. Ova borne 

 on the very large manubrinm.. 



13B. 



13. Mytnrti* hnoitfri Sigerfoos. 



A. Nutritive hydranth or "person." ~ 



B. Reproductive hydranth or "person." 



14. Pfntmria ttai-elfa McCr. 



A. Branch of colony. 



B. Hydranth with medusae (enlarged). 



C. Single sessile medusa' (enlarged) . 



Color. A. specimen kept for some time in formalin is of a reddish flesh color. I have not seen 

 the free medusae, and the color is not given by the original describer. 



Distribution. Found on shells of a living gasteropod, Ilyanasxa obsolete!. A colony was found at 

 Woods Hole in 1886. Dr. Sigerfoos found numerous specimens at Coldspring Harbor, Long Island. 



PENNARID^E. 



oinr. Colony regularly branched (in our species). Hydranths with a proximal circlet of 

 filiform tentacles and a distal set of spirally arranged or whorled capitate tentacles. 



GfHioaome. Gonophores producing medusa; which are either attached permanently or become 

 free when mature, and which have 4 radiating canals and 4 rudimentary tentacles. 



