The porifera and coelentera . Fic. 5j.—Liiuiiociiida from the oral surtiUM (afti-r Guiitlier). manubrium and sliallowness tif the gastric cavity, it strangely rescmliles many Cuninae, ami in bud-ding from the mauubriuni,it a]>proaches the Antho-mediisae. No hydroid stagelias been observed in its life-history. Lininocodiuni, on theother hand, resembles moreclosely Lejitomedusae andTrachomedusae (Figs. 52,53). Its generative orgjins, ofwhich the male only havebeen obscrvetl, are i)laced onthe radial canals, as in bothtliosse orders ; but it has ahydroid stage, a thing notknown in any Tracho-n
The porifera and coelentera . Fic. 5j.—Liiuiiociiida from the oral surtiUM (afti-r Guiitlier). manubrium and sliallowness tif the gastric cavity, it strangely rescmliles many Cuninae, ami in bud-ding from the mauubriuni,it a]>proaches the Antho-mediisae. No hydroid stagelias been observed in its life-history. Lininocodiuni, on theother hand, resembles moreclosely Lejitomedusae andTrachomedusae (Figs. 52,53). Its generative orgjins, ofwhich the male only havebeen obscrvetl, are i)laced onthe radial canals, as in bothtliosse orders ; but it has ahydroid stage, a thing notknown in any Tracho-niedusan, known not tooccur in many Trachome-dusae, and probably universalamong Leptomedusae; yetthe firm character of the bell and tentacles suggest Trachomedusin Kio. 55n.—UiiiRrain of tin- p-niniation of tin iiiimIu-soiil of /.iiiiiiiHVKiiinii. a, cxti-nwil poUkIitiii ; h, tMiiio-diTin of tli nuliiil caimls ; c, cofltiitoron of tlic hydroiit ;(f, cavity of railial i-anal; r, fctiMli-riii of iiiaiiiil>riiiin ;/, rudiiniiit of sul)iiiiil>nil cavity ; ii>lo<l<nii of niaimliriiini, »itli liliml canals0); i ^y fctixli-rm of ciitocotlon. (Aft<i Kowli-r.) THE HYDRO MEDUSAE 49 The continuation of the tentacles along the exumbral surface into aroot, which occurs in both of tht; \vater genera, although not quiteof the character known in Trachoinedusae and Narconiedusae, is never-theless suggestive, and the presence of some-thing corresponding to peronia points in thesame direction. As regards the character of the sense organs,which are of great diagnostic value throughouttlie class, Lininocodium and Limnocnida agreewith each other in possessing similar organs, ofa type not know
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