9 
9) 
Appenpa.—Of the specimens received from Mr. Lawson, some individuals 
are younger than either of Dr. Blake’s. In these the polyp-rows are farther 
apart, and there are not so many polyps in the row ; neither do the ends of the 
rows approximate so closely on the side opposite the axial edge ; the polyps being 
not nearly so many in the same length, or presenting (as do some of Dr. Blake's 
specimens) so crowded an.appearance. In cross-section through the polypiferous 
portions, the younger individuals are less ovate or acutely oval than in the older 
specimens. The general aspect of this species. judging from the figure in Plate 
XXXI. of Johnson’s British Zoophytes (2d ed.), is like P. quadrangularis from 
Oban. 
