220 F. A. BEDWELL ON A METHOD OF EXAMINING 



forward and begins to appear on the under side of the disc, where 

 the craspedum terminates, and then follows the line of each septum 

 down to the free edge' of the stomach-wall. In fact, it was 

 by lifting up that edge that I found it. There is a line of it on 

 the back of the stomach wall answering to each septum, and where 

 the quaternaries occur, it follows a rib-like projection, looking very- 

 like a prolongation of a septum along the disc, and down the stomach- 

 wall, and it clings to that rib/ but at the angles where the two 

 gonidia lie, it will be found that about a quarter of an inch of the 

 stomach-wall is free and unattached to any septum ; and even there 

 the fluted organ will be found lying at the back of the wall. 



In S. parasitica and A.dianthus its attitude is particularly striking. 

 Here, again, the relation of the parts changes — the eggs take an 

 entirely novel attitude — the craspedum now, as in A . mesembryanthe- 

 mum, never appears on the quaternaries, but only on primries, 

 secondaries, and tertiaries, and at first only at the lower or basal 

 portions of their edges. When the eggs first appear they are seen 

 on the edges of the secondary, tertiary, and quaternary septa, but 

 not on the primary septa, and they lie in separate bunches. 

 Before the eggs appear the upper portion of the edge of each 

 secondary and tertiary, and the whole of the quaternary septum is 

 occupied by the fluted organ, as in A. mesembryanthemum, so that 

 when the eggs do appear they actually lift the organ up into the 

 position seen in Fig, 7, pi. XII, a position in wlrch it can be dis- 

 tinguished through the disc of S. parasitica, waving backwards and 

 forwards over the bunches of eggs, and at the same time holding on 

 to the septum at each extremitv, as in the figure. A magnified 

 group of eggs is seen in Fig. 10, pi. XII. In November, as the 

 autumn advances, the eggs assume in A. parasitica a different appear- 

 ance, and on extracting a quaternary septum it was found that the 

 eggs, which in September were in separate bunches, now lay in four 

 rich continuous longitudinal masses projecting from the edge of the 

 septum, as in Fig. 11, pi. XII ; but still there was no craspedum on 

 the quaternaries. On turning, however, to the secondary and 

 tertiary septa, and extracting portions of them, it was found that 

 there the eggs were not continuous, but the craspedum, which in 

 September was confined to the lower or basal portion of the septum, 

 had ascended it, and appeared in tufts between the bunches of eggs ; 

 and it seems to be due to the fact of its non-appearance on the 

 quaternaries that makes those septa so profusely rich in ova, there 



