178 
those carried on the first proximal stalk The stalk to which the 
blades are attached, more especially those between the teeth, are, as 
we have already stated, extremely slender They are, in fact, scarcely 
thicker than the fine marginal hairs of the labella, are filamentous in 
character, and in stained preparations present a well-marked granular 
appearance. The relative position of these organs in the everted 
sections may be seen in figs. 2, 3, j<j, 1 1. 
( 3 ) ROD-LIKE Hairs (ni in all the figs.). These are dark in 
colour, in fact almost black; they arc* long, more or less curved 
bluntly rounded at the tips, and apparently grooved on one side 
1 hey are articulated to strong cylindrical bases similar to those of the 
ventral external hairs, are fixed in a semi-erect position, and are 
arranged in the following order: One opposite the tip of the firs', 
(proximal) tooth, a pair opposite each of the second, third, fourth and 
fifth tooth, and one opposite the accessory tooth, making ten in all 
S ^ 1<?se Q1 gans are inserted on nucleated cells they are probably 
sensory in function. The position of these organs, when the labella 
are everted, is shown in figs. 2, 3, 10, 1 1 
ihe Operculate Hairs (n in all the figs.). These at 
lute cylindrical organs with suddenly truncate extremities, froi 
ie edge of which there arises a flat oval-shaped lid or flap, whic 
five of T angle ° f 45 ° 0r more froni ‘he margin There a. 
hrp-e ip f 1 Se cunous or £ ans » one opposite the tip of each of the fiv 
int~/ K y f ° rm 3 ***** curve d line and are fixed to th 
of the petiolL^bfedeT 3 Th etWeen ^ endS ° f teC ' h ““ '‘ P 
labella is shown in fig ,, ^ P ° S ‘ tlon of these O'S™* in the evertel 
lon& 5 lwolto, EC ii TE i? HA ' RS in a " lhe fi gs). These are rathe 
branched portion^ be’ ^ d ' V ' ded a little beyond the middle, th' 
marked and al extreme ly slender. They form six well 
operculate hairs "earl C ° nt,nu ® us ;& rou P s « slightly in advance of the 
rows (fig. 8). "phe r ' ^‘ r >U ^ iav,n f? a tendency to arrange itself in tc 
(figs. 10, 11') i, lcf 1 \ J>c< U P> ,l lateral position in the everted section? 
(6) The A 16 Ventml ***** of labella. 
These hairs clothTfte FR ™ GE ° F Hairs O’ in a11 the fip) 
of the labellum (firr q\ " ° f t,,e extreme anterior dorsal margin 
1 hls fnn ge is broad basally, but gradually 
