| One of the most interesting features in the elasmobranch development is the formation of the notochord from the hypoblast. |
| Systematic, paleoecologic and paleobiogeographic analysis of the Plio-Pleistocene Mediteranean elasmobranch fauna. |
| Next in point of time to the paper of Schenk, is my own preliminary account of the development of the elasmobranch Fishes. |
| The development of the elasmobranch excretory system has been mainly studied by Semper and myself. |
| This difference no doubt depends upon the greater quantity of yolk particles present in the elasmobranch ovum. |
| In this layer nuclei appear, which are equivalent to those in the elasmobranch ovum. |
