372 Burt. — Development of Mutinies caninus. 
Fig. io. Median longitudinal section through an egg in which the rudiment of 
the stipe is differentiating into chamber-tissue and that of partition-walls. The 
lower part of the figure is from another section in the same series, x 8|. 
Fig. ii. Portion of rudiment of the stipe in about the stage of Fig. io, showing 
the chamber-tissue c, c and the portions between and about these which become 
partitions of pseudoparenchyma later. x 325. 
Fig. 12. Portion of the upper part of the fundament of the stipe of Fig. 10, 
showing a ‘pit’ and the tissues in its vicinity. x 325. 
Fig. 13. Median longitudinal section of the stipe and adjacent parts of an egg in 
a late intermediate stage. x 9. 
Fig. 14. Portion of Fig. 13 showing wall of stipe just below the ‘ spore-bearing ’ 
part, showing the connexion of the tissue A with the tissue c of chambers through 
passages which are perforations or openings in the external surface of the stipe 
after its elongation. ( Corynites Ravenelii , B. & C., with specimens of which my 
material agrees, was supposed to differ chiefly from M^^tin^^s caninus (Huds.) in 
this portion of the stipe. Comparison of this figure with Ed. Fischer’s (1895) 
Fig. 9 of European M. caninus in a somewhat older stage shows no essential 
structural difference.) 
Fig. 15. Longitudinal radial section through the wall in the ‘spore-bearing’ 
part of the stipe. Comparison with Fig. 12 shows the thickening of the wall 
in this part to be by the formation of a later zone of pseudoparenchyma k from the 
intermediate tissue A . A ‘ pit ’ c is on the right, x 325. 
