PLATE XIII. 



Ascidia sordida A. & H. (p. 119) 

 KEPRODUCTION. 



FIGS. 



1 . Test and mantle laid open, showing reproductive organs 



ovary in centre, male caeca on either side, and 

 oviduct full of eggs mostly passing out in single 

 series : about twice natural size. 



2. Anal aperture, oviduct, and vas deferens : magnified. 



Cf. Plate XII, figs. 3 and 4. 



3. Aperture of oviduct (a) and of ras deferens (b} : more 



highly magnified. 

 4-6. Clusters of eggs : highly magnified. 



7. A single ovum, showing glassy layer (a) and yolk (b) : 



highly magnified. 



8. Male casca : magnified. 



