. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KOFOID AND RIGDEN: SCHIZOGONY IN GONYAULAX. :u:; known species of the genus. It is evidently closely related to G. triacantha. Further material is necessary to determine the character of this region in the form we have found. The accompanying figures, A and B, give the arrangement of plates and structure of the ventral area in G. triacantha. They will make clear the affinities of the organism here described to Gonyaulax and also the general resemblance between G. triacantha and G. catenata, in form, plates, and antapi
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KOFOID AND RIGDEN: SCHIZOGONY IN GONYAULAX. :u:; known species of the genus. It is evidently closely related to G. triacantha. Further material is necessary to determine the character of this region in the form we have found. The accompanying figures, A and B, give the arrangement of plates and structure of the ventral area in G. triacantha. They will make clear the affinities of the organism here described to Gonyaulax and also the general resemblance between G. triacantha and G. catenata, in form, plates, and antapical spines. Our analysis of G. triacantha is based upon actual separation of the elements along the suture i/.a. ^ \- — . —...2' 1 _fll Jj'l r ^.—.^ /" NV -"-£"' K A Fig. A. Gonyaulax triacantha showing arrangement of plates. Fig B. Ventral view of the same. X 467. lines as drawn. The analysis of the theca here given is a correction of the analysis previously given by the senoir author (see Kofoid, 1906) in that two anterior intercalaries are added and the inter- pretation of the apical region is modified, one small postcingular Y" is added and the "accessory plate" is here called the posterior intercalary. It is not possible to determine from Levander's (1894) or Vanhoffen's (1897) figures of G. catenata or from Levander's discussion whether the skeleton undergoes fission or not, that is whether the chain forma- tion is of the same type as in Ceratium or similar to that described here for G'. scries. The fact that the schizonts are of uniform size and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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