The morphology and evolutional significance of the pineal body : being part I of a contribution to the study of the epiphysis cerebri with an interpretation of the morphological, physiological and clinical evidence . catus. Ramsay Wright (84).43° The pinealorgan in this species is tubular and has the same thicknessthroughout its entire extent. It ends in a fatty tissue. Itsend-vesicle does not reach the cranial roof. Its walls are thinand form no folds. 11. Callichthys asper and litioralis. Dean (88).81 In bothof these forms there is a parietal foramen with a retinoid tissuelying beneath it. K
The morphology and evolutional significance of the pineal body : being part I of a contribution to the study of the epiphysis cerebri with an interpretation of the morphological, physiological and clinical evidence . catus. Ramsay Wright (84).43° The pinealorgan in this species is tubular and has the same thicknessthroughout its entire extent. It ends in a fatty tissue. Itsend-vesicle does not reach the cranial roof. Its walls are thinand form no folds. 11. Callichthys asper and litioralis. Dean (88).81 In bothof these forms there is a parietal foramen with a retinoid tissuelying beneath it. Klinckowstroem208 in 1893 found a parietalforamen closed by connective tissue in these forms. An end-vesicle was located here, but showed no particular specialization. 12. Doras, Clarias, Loricaria. Dean (88).81 In these speciesthere is a parietal foramen. ION FREDERICK TILXEY AND LUTHER F. WARREN 13. Coregonu* albus. Hill (91).179 In the embryonic stateof this species the anlagen of the pineal and parapineal organsboth occur. 14. (( feres. Hill (94)I8° found the anlagen of theanterior and posterior epiphysis in embryos of this form. Thesewere almost transversely placed in relation to each Kiii. •>(> Transverse sect ion t hroujili t lie end -vesicle of 1 lie pineal oruan in Leu-riscus riitilus, according to Ralil-Riickhanl, pineal or^ini; /////., lieiiiis|ilieres. IT), (ohm* ./V/. and Studnicka ClMi).386 Thepineal oru,;in in these sp(Hies is tubular. The distal (Mid forms alariie sac which lies beneath the skull. The pinealis ispresent. THE PINEAL BODY 109 16. Belone acns. Studnicka (96).38i In this species there isa long, tubular stalk. Ependymal cells form the walls of thisstalk and have an arrangement reminiscent of the retinal sen-sory cells of the retina of Petromyzon especially of the region ofthe large end-vesicle (fig. 57). 17. Cyprhius carpio. Studnicka (96).383 The end-vesiclein this form is a circumscrib
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