143 



DESCRIPTION OF THE PLATES. 



The letters have the same signification in Plates I to XI. The short ruled lines indicate 

 the natural sizes of the objects. 



a. Ccenosarc (koitoc, common ; aa^t., flesh). ^*- ' 



b. Polypite ; b^, vilh; b", pyloric valve. 



c. Tentacle; c\ pedicle of the sacculus (reniform body in PInjmlid); c\ involucrum ; 



c^ sacculus ; c*, filament ; c% median lobe ; e\ basal sac ; c', muscular band. 

 (I. Somatocyst ((TWiua, body ; /cuuric, a vesicle). 



e. Pneumatophore {vvivfia, air; foolu), I bear). 



/. Pneumatocyst (7n'tU|««, kvotiq); f\ the endoderm reflected over it; /", the cellular 

 processes of this layer of the endoderm ; f', the mesentery-like lamelke connecting: 

 the pneumatocyst with the pneumatophore ; /^ the air contained in the pneuma- 

 tocyst. 



</. Nectocalyx (i-i/ktoc, having the power to swim; Kukvi, a cup); (f, the proximal 

 nectocalyx of a Caiycophoridan ; /, the distal nectocalyx ; /, the nectocalycine 

 duct and canals, both radiating and circular, and in gonocalyces as well as in 

 nectocalyces ; /, the nectosac; f, its aperture, surrounded by its membranous 

 valve ; /, the hydroecium (oi/coc, a house) of the proximal and the hydroecial canal 

 of the distal nectocalyx. 



Ii. Hydrocysts. 



k. Hydropiiyllium ; /t\ phyllocyst (^uXXoi-, a leaf). 



/. Gonocalyx (yokoc, progeny). 



m. Gonoblastidium (jSAaarj), a bud). 



n. Androphore ; w\ its calyx ; n^, its manubrium ; M^ spermatozoa. 



0. Gynophore ; o\ calyx ; o^ manubrium ; o^ ova. 



X. Endoderm. 



y. Ectoderm. 



