The porifera and coelentera . Fl(i. OS. Divelopiiiont of Clnthrina hlanca as seen in sections. 1, larva; 1-1, four staps in thonioilitiuitioii and inmii^tration of a riliatoil cell into the inner mass ; 2, section of pnjMi aftercompletion of meUtniorpliosis (llrst day); 3, section of pujia on tlie second day. Tlio iminl^ra-tion of cells from the dermal epithelium, to form the skoletogenous stratum, is goinn on actively,tho porocytes are agnregated in the centre, and the gelatinous ground substance is making itsappearance. 4, section of pupa early on the third day. The gastral cavity, lined by
The porifera and coelentera . Fl(i. OS. Divelopiiiont of Clnthrina hlanca as seen in sections. 1, larva; 1-1, four staps in thonioilitiuitioii and inmii^tration of a riliatoil cell into the inner mass ; 2, section of pnjMi aftercompletion of meUtniorpliosis (llrst day); 3, section of pujia on tlie second day. Tlio iminl^ra-tion of cells from the dermal epithelium, to form the skoletogenous stratum, is goinn on actively,tho porocytes are agnregated in the centre, and the gelatinous ground substance is making itsappearance. 4, section of pupa early on the third day. The gastral cavity, lined by imrocytes,and the spicules have ai)peared. 5, section of pupa towards the eu<l of the fourth day. Thegastral cavity is lined by gastral cells, whidi are commencing to develop collars and llagella,while their nuclei are migrating towards the bases of the c«m1s. The spicides are largi; theposition of the future oscubim is indicated ; the porocytes are migrating outwards ; and theamoebocytes have changed in appearance,
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
