Manchester Memoirs, Vol. xlvi. (1902), No. 16. 5 



consist of a large number of scales of fusiform or con- 

 centric outline, which are disposed roughly speaking in 

 concentric layers forming a kind of cup, in which the 

 central mass is lodged. Tangential sections show these 

 to be rounded scales, under which name, as it implies no 

 theory as to their function, we may conveniently speak of 



^4'. 3- 



Median section of one of ihe large ocular organs: a.c, 

 anterior cap ; /;., hasal layer of cartilage ; c, connective tissue 

 capsule; c.p., conical projection of central mass; /, round 

 bodies near external surface ; i.e., inner cup ; i.co., inner cone; 

 /., lacuna ; ;/., nerve ; p.c, posterior cup ; s., space between the 

 anterior cap and external surface ; s.k., spheroidal knob of 

 central mass. 



them. In my preparations, stained with haematoxylin, 

 these scales are very darkly coloured and stand out in 

 marked contrast to the surrounding tissues. A difference 

 in structure between the inner and the outer cells is at 

 once apparent. The former are much more regular in 

 shape and with much more even outline than the latter ; 



