266 T. H. Burtenp, The pronephros of Scyllium canicula. 
Fig. 91 (Section 3,70). The groove becomes converted into a duct 
on the left side of the figure in this section. Compare with figs. 79 and 80. 
Fig. 92 (Section 3,71). Notice the closure of the groove on the 
right side of the figure. 
Fig. 93 (Section 3,72). The pronephrie duct on the right side of 
the figure still has a solid connection with the epithelium, whereas on the 
left side the duct is absolutely free. 
Fig. 94 (Section 3,73). The last trace of the second pronephric 
nephrostome on the animal’s left side is seen in this and the next figure. 
Fig. 95 (Section 3,74). There is still a trace of the second left 
nephrostome showing on the right side of this figure as a solid connection 
between duct and coelomic lining. 
Fig. 96 (Section 3,75). The duct is quite free from the coelomic 
epithelium in and after this section at this stage, viz. embryo K. 
G. Pätz’sche Buchdr. Lippert & Co. G. m. b. H., Naumburg a. d. S. 
