THE PINEAL BODY 107 



in irregular acini. The tractus pinealis persists. The anterior 

 epiphysis in the adult is reduced to a small mass of cells. 



5. Anguilla fluviatilis. Cattie ('82) . 60 In this species there 

 is a proximal portion and a cylindrical end-sac. Ley dig 239 in 

 1896 described the end- vesicle as very much reduplicated and 

 highly vascular. Galeotti 140 in 1896 saw a clear caryoplasm and 

 no granules or nucleoli in the end-vesicle. He, therefore, con- 

 cludes that there is no evidence of secretory activity in this 

 form. 



6. Clupea alosa. Cattie ('82). 60 A strand-like stalk and an 

 expanded end-vesicle are observed in this form both of which 

 are solid. 



7. Clupea harengus. Holt ('91). 189 In the late larval stages, 

 the epiphysis in this species is a solid body. In younger em- 

 bryos a nerve bundle extends from the pars intercalaris up the 

 stalk. In the later stages there is a saccular epiphysis with a 

 wide lumen three or four cells deep. The lumen is filled with a 

 coagulum. The tractus pinealis is present in the dorsal wall of 

 the stalk. 



8. Leuciscus rutilus. Rabl-Ruckhard ('83). 319 The distal end 

 of the organ in this form is flattened out against the inner 

 surface of the skull. There is a very thin but long stalk (fig. 56). 



9. Leuciscus cephalus. Galeotti ('96) 14 found in the cells of 

 the pineal organ those above-mentioned structural peculiarities, 

 which he considered indications of secretory activity. 



10. Amiurus catus. Ramsay Wright ('84). 43 The pineal 

 organ in this species is tubular and has the same thickness 

 throughout its entire extent. It ends in a fatty tissue. Its 

 end-vesicle does not reach the cranial roof. Its walls are thin 

 and form no folds. 



11. Callichthys asper and litioralis. Dean ('88). 81 In both 

 of these -forms there is a parietal foramen with a retinoid tissue 

 lying beneath it. Klinckowstroem 208 in 1893 found a parietal 

 foramen 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 species 

 there is a parietal foramen. 



