THE CAMPANULAKID^ AND THE BONNEVIELLID^. 57 



CLYTIA NOLIFORMIS (McCrady). 



Plate 11, figs. 7-10. 



Campanuiaria noUformis McCradt, Gymnopthalmata of Charleston Harbor, 1859, p. 92. 



Platypyxis eylindrica (part) A. Agassiz, in North Amer. Acalephse, 1865, p. 80. 



Epenthesis folleata (medusa form) Bkooks, Studies from Johns Hopkins Biological Laboratories, vol. 2, 1882, p. 138. 



Clytia noliformis Pictet, Hydraires d'Amboine, 1893, p. 31. 



Clytia noliformis Nutting, Hydroids of the Woods Hole Region, 1901, p. 343. 



Clytia simplex Congdon, The Hydroids of Bermuda, 1907, p. 471. 



Clytia volubilis Hargitt, Hydroids of Woods Hole, 1909, p. 373. 



Clytia folleata (medusa form) Mayer, Hydroids of the World, vol. 2, Hydromedusse, 1910, p. 264. 



Clytia simplex Stechow, Hydroiden der Miinchener Zoologischen Staatsaammlung, 1912, p. 352. 



Trofhosome} — Colony consisting of a creeping rootstock from whicli unbranched pedicels 

 arise. Rootstocks sometimes irregularly and coarsely annulated, but usually smooth. The 

 pedicels are short, none in the specimen described being more than twice as long as the hydro- 

 theca, excessively annulated at the ends and sometimes tliroughout their length, stiff and strong. 

 Hydrothecae conoid in shape with the margin much wider than the basal parts and the sides 

 often nearly straight, although they may be shghtly bulging. The margin bears about 14 very 

 strongly developed teeth, deeply cleft in some cases and much more shallow in others, with evenly 

 rounded points or ends. Diaphragm low, not strongly marked. In specimens collected by 

 the author in the GuK Stream the hving hydranths were a Hght clear green due to a symbiotic 

 alga. 



Gonosome? — Gonangia flask-shaped, with well-marked collar and hd. The general form is 

 ovoid, but the flaring collar gives it an appearance which can well be termed urn-shaped, a word 

 used in this connection by McGrady in his original description. Developing medusae are seen 

 within the gonangia. The medusse are described and figured by Mayer under the name Clytia 

 folleata. A condensed description is as follows: 



Bell hemispherical or slightly flatter. Tentacles 16, 4 radial canals, 16 closed marginal lithocysts. Velum well 

 developed, manubrium about half as long as bell cavity, with four simple lips. Gonads very near the ring canal. 



Distribution. — The type-locality is Charleston Harbor. It has been found also on floating 

 sargassum weed in the GuK Stream. According to Mayer the medusse are very abundant off 

 the southern coast of New England in summer and off the Dry Tortugas, Florida, in the spring. 

 It has also been found off the Bermudas by Congdon, in the Bay of Amboina by Pictet, and 

 on the Japanese coast by Stechow. 



The above-described species fits the original description by McCrady very closely, and 

 appears distinctly different from Clytia eylindrica Agassiz. 



CLYTIA SARGASSICOLA, new species. 



Plate 12, figs. 8, 9. 



TropJiosome.^ — Colony consisting of a creeping rootstock from which arise unbranched 

 pedicels bearing hydrothecse, pedicels rather long and slender with a disk-shaped internode just 

 below the hydro theca followed by one or more rather indistinct annulations. There are a few 

 faint annulations near the proximal end of the pedicel. Hydrothecse campanulate, subcyhn- 

 drical, with sides not flarmg and with 12-15 roimded marginal teeth. Hydro thecse about 1.5 

 times as long as broad and the lower part of the hydrothecal wall distinctly thickened forming 

 a sort of pseudodiaphragm. Distal portion of walls very thin and collapsible, this portion 

 being differentiated from the thicker part by a circular hne which is evident when the thin 

 part is folded over the retracted hydranth. The arrangement is the same as is illustrated by 



' Description of specimens sent me by Doctor Osborn, labelled Beaufort, North Carolina. 



^ Described from a specimen collected by the Bahama Expedition from the State University of Iowa, growing on 

 seaweed in the Gulf Stream off the Carolinas. 



' Description of a specimen taken from the surface on the southern edge of the Gulf Stream by the Bahama Expe- 

 dition from the State University of Iowa, May 9, 1893. 



