192 VANDE^. Chap. VU, 



of SO forcible an ejection no doubt is to drive the soft 

 and viscid cushion of the disc against the hairy thorax 

 of the large hymenopterous insects which frequent the 

 flowers. When once attached to an insect, assuredly 

 no force which the insect could exert would remove 

 the disc and pedicel ; but the caudicles are ruptured 

 without much difficulty, and thus the balls of pollen 

 might readily be left on the adhesive stigma of the 

 female flower. 



Gafasetum callosum. — The flowers of this species * are 

 smaller than those of the last, but resemble them in 

 most respects. The edge of the labellum is covered 

 with papillae ; the cavity in the middle is small, and 

 behind it there is an elongated anvil-like projection, 

 — facts which I mention from the resemblance in some 

 of these points between the labellum of this species 

 and that of Myanthus iarbatus, the hermaphrodite form 

 of Oatasetum tridentatum, presently to be described. 

 When either antenna is touched, the pollinium is 

 ejected with much force. The yellow-coloured pedicel 

 is much bowed, and is joined by a hinge to the ex- 

 tremely viscid disc. The two antennae stand sym- 

 metrically on each side of the anvil-like projection, 

 with their tips lying within the small cavity of the 

 labellum. The walls of this cavity have a pleasant 

 nutritious taste. The antennae are remarkable, from 

 their whole surface being roughened with papilla). 

 The plant is a male, and the female form is at present 

 unknown. 



Gafasetum tab ulur e.^Thia species belongs to the 

 same type as C. saccatum, but differs greatly from it in 

 appearance. The central portion of the labellum con- 

 sists of a narrow, elongated, table-like projection, of 



• A fine sp'ke nf flowers of this Mr. Eucker, and was named for 

 species was kindly sent me by nie by Dr. LindLy. 



