PLATE XII. 



Fig. 



1. Galeolaria flifornm, magnified (after Gegenbaur). .4, proximal, B, distal nectocalyx; 



a, somatocyst ; b, nectocalycine canals ; c, aperture of the proximal, d, of the 

 distal nectosac ; e, valvular projection at the aperture of the distal nectosac ; 

 /, ccenosarc, with the polypites ; h, nectosac of the proximal, i, of the distal necto- 

 calyx. 



2. Praya maxima, slightly enlarged (after Gegenbaur). A, B, the nectocalyces ; a, a, their 



nectosacs ; b, origin of tlie coenosarc, d ; c, c, nectocalycine canals ; e, polypites, 

 with their hydrophyllia and tentacles. 



3. A single zooid viewed laterally (after Gegenbaur). a, hydrophyllium ; b, gonocalyx and 



manubrium ; c, polypite ; d, tentacle. 



4. Hippopodius neapolitanus (after Kolliker). a, perfect, b, undeveloped, nectocalyces ; 



c, nectosacs ; d, coenosarc, with six undeveloped polypites ; e, fully developed poly- 

 pites, near which gonophores, which are omitted, were seated ; f, tentacles. 



5. The proximal end of the coenosarc, with some nectocalyces still attached (after Leuckart). 



6. Vogtia pentacantha (after Kolliker). a, nectocalyces; b, polypites; c, androphore ; 



d, gynophore ; e, tentacles. 



7. Different views of the nectocalyces. a, aperture of the nectosac. 



8. Apolemia uvaria (after Gegenbaur). The proximal end of the hydrosoma, about three 



fifths of the natural size, a, pneumatophore ; h, hydrocysts among the necto- 

 calyces ; c, coenosarc ; d, hydrophyllia ; e, hydrocyst ; /, tentacles ; g, polypites. 



9. Halistemma rubrum (after Kolliker) ; less than the natural size, a, pneumatophore ; 



b, young nectocalyces ; c, fully formed nectocalyces ; d, e, coenosarc ; /, hydrophyllia ; 

 g, polypites ; /i, hydrocysts ; i, tentacles of the polypites ; /c, tentacles of the hydro- 

 cysts. 



9 a. The end of a tentacular branch, a, the pedicle ; b, the sacculus ; c, the filament. 



10. Fors/i-alia Edioardsii (after Kolliker). «, pneumatophore ; «', young nectocalyces ; b,b',c, 



cylinder formed by the nectocalyces, and traversed by the coenosarc, i ; d, poly- 

 pites ; e, hydrophyllia ; g, hydrocysts ; h, tentacles. 



11. The end of one of the full-grown tentacular branches oi PJigsophora Philippii, much 



magnified (after Kolliker). «, the pedicle ; <5, the outer layer of the involucrum; 

 r, its middle, and d, its inner layer ; e, its cavity, in which the sacculus lies, and 

 which opens at h ; f, the free end of the sacculus ; g, a muscular band fastened to 

 its other end. 



12. Phjsalia {utriculus)'^ Natural size (original), a, crest; b, c, pneumatophore and coeno- 



sarc ; d, its processes ; e, the polypites ; /, velvetty masses ; g, tentacles ; h, tenta- 

 cular sacs. 



13. Chrgsomitra striata; about twice the natural size (after Gegenbaur). a, gelatinous 



substance of the nectocalyx. 



14. Porpita mediterranea, seen from below (after Kolliker). a, the central polypite ; b,b,b, 



small or gonoblastidial polypites ; c, c, small tentacles ; d, d, large tentacles ; e, mar- 

 ginal limb. 



15. A perpendicular section through the same (after Kolliker). a, pneumatocyst, with its 



chambers; a', central chamber; b, proximal layer of the hydrosoma; c, limb; 

 d, small, e, large, tentacles ; / liver ; g, central polypite ; h, gonoblastidial polypites, 

 with the gonophores, h' ; i, renal organ, or white plate. 



