340 



REPORT — 1894. 



Such, then, are the bare facts of the chromatic reductions in these carti- 

 laginous fishes. But it must not be supposed that they are more than the 

 "rossest features presented by a mass of material which will take many 

 months in fully working up. 



Nor yet are they in a strictly anatomical sense by any means the most 

 interesting features in relation to these cells ; the large clear elements of 

 the Elasmobranch testes present a splendid field for more purely cyto 

 lo"ical research, and I gave the briefest account of the direction in which 

 such investigations seemed tending in the article above referred to. Very 

 little is really known respecting cellular metamorphosis, or the morpholo- 

 gical value of the intercellular structures relating to it ; in fact, we are only 

 just beginning to extend morphological conceptions to cellular anatomy at 

 all. Consequently it is with the profoundest interest that I find among 

 other things the archoplasmic vesicle of the Elasmobranch spermatid to 

 have an intra nuclear origin, although it remains identical in structure 

 and minute relationship with that of the Mammalia, a pui'ely cytoplasmic 

 construction. 



In conclusion, I would express my thanks to the British Association 

 for the opportunity of completing my work, and to the Directors of the 

 Naples Laboratory for their unremitting kindness during my stay. 



JI. — A List of Naturalists who have worked at the Zoological Station from 

 the end of Jime 1893 to the end of June 1894. 



