208 DEVELOPMENT OF CYSTOCARPS IN CALLOPHYLLIS. 
The spores sometimes lie in the position left by the last 
divisions ; more generally, in the ripe condition they are entirely 
free from each other. 
Dehiscence takes place by an opening in the wall on the side 
of the eystocarp. 
The conelusion, then, to which my E leads is, that 
the cystocarp of Callophyllis laciniata is a compound body, 
including the products of a number of procarps. 
The investigation was carried on at the Normal School of 
Science [now the Royal College of Science], in the Laboratory of 
Dr. D. H. Scott, to whom I have been indebted for continual 
advice and assistance. 
The material was collected and preserved at Plymouth during the 
summer of 1889 by Professor T. Johnson of Dublin, who kindly 
placed it at my disposal for investigation. I have also to thank 
him for much help and encouragement during the progress of my 
work. 
EXPLANATION OF PLATE XXXV. 
c=carpogone ; Z=trichogyne; a=auxiliary cell. 
Fig. 1. Carpogone unfertilized with 2 auxiliary cells. 444. 
Fig. 2. Semi-superficial section of a young cystocarp, showing several pro- 
carps and trichogynes. x170. 
Fig. 3. One or more procarps after fusion, showing the nuclei. The remains 
of a trichogyne are still to be seen. x444. 
Fig. 4. Procarp, showing the primary and secondary division- -stages towards 
the formation of spores. x 440. 
Fig. 5. Section through an almost ripe eystocarp, showing the grouping of 
the spores. x 166. 
