Fes. 1909.] BOTANICAL SOCIETY OF EDINBURGH 31 
in a large number of Bromeliacee in cultivation in the 
Royal Botanic Garden, Edinburgh. Plants from the 
Botanic Garden, Glasgow, also show the same attack. 
No anatomical details can, as a rule, be made out in these 
99. Practically all examined have been in the last stage— 
nothing more than sacs of eggs or more or less empty skins 
containing some protoplasmic debris. Occasionally large 
nuclei may be seen—apparently the last traces of the 
alimentary canal. <A section of the creature’s attack in 
a vas thus often shows merely a clear thick zone lining 
the cavity. Within there is a film of protoplasmic matter 
(Plate IV. fig. 5). The clear zone referred to is, of course, 
the thick and practically unstainable epidermis character- 
istic of Nematodes. 
I do not know of any measurements made in the case 
of H. schachtii and H. radicicola. The present attack may 
be the work of a distinct species or even of more than one 
species, should the form infesting plants in the Royal Botanic 
Garden, Edinburgh, prove to be different from that found 
in Glasgow. The following dimensions may be given :— 
Length. Breadth. 
1. Adult Q from Pttcairnia sp. 
(lemon-shaped). Edinburgh . 588 mm. 35 mm. 
2. Much younger ? from Piteairnia 
sp. (shaped like a Florence flask) 448 mm. 165 mm. 
(This example began to narrow at a point ‘21 mm. from the 
genital aperture. It there measured ‘07 mm. in breadth.) 
3. Eggs of 2 No. 1, still in the 
body of the mother ¢ : ‘084 mm. 028 mm. 
Satisfactory measurements of the endodermal galls have 
not yet been obtained for all three dimensions. In a number 
of sections taken from a root of Pitcairnia bracteata 
(Glasgow Botanic Garden) the length of the gall is -252 
mm. and the breadth ‘112 mm. 
In a gall from an Edinburgh plant (P. corallina) the 
transverse measurements are ‘154 and ‘112 mm. respectively. 
The length cannot be determined. 
The worm then, one would imagine, must be under 
pressure. Apparently, too, it may be folded on itself within 
the gall, but details are not easily made out. 
Changes in the tissue near the gall have now to be 
described. 
Very characteristic are the effects on the endodermis 
