GENLISEA ORNATA. 



fCnAP. XVIII. 



thrice enlarged, will illustrate the following description by 

 my son, which agrees in all essential points with that given 

 by Dr. Warming. The utricle (6) is formed by a slight en- 

 largement of the narrow blade of the leaf. A hollow neck 

 (n), no less than fifteen times as long as the utricle itself, 

 forms a passage from the transverse 

 slit-like orifice (o) into the cavity of 

 the utricle. A utricle which measured 

 A of an inch (.705 mm.) in its longer 

 diameter had a neck if of an inch 

 (10.583 mm.) in length, and tIv of an 

 inch (.254 mm.) in breadth. On each 

 side of the orifice there is a long 

 spiral arm or tube (a) ; the structrue 

 of which will be best understood by 

 the following illustration. Take a nar- 

 row ribbon and wind it spirally round 

 a thin cylinder, so that the edges 

 come into contact along its whole 

 length; then pinch up the two edges 

 so as to form a little crest, which will 

 of course wind spirally round the 

 cylinder like a thread round a screw. 

 If the cylinder is now removed, we 

 shall have a tube like one of the spiral 

 arms. The two projecting edges are 

 not actually united, and a needle can 

 be pushed in easily between them. 

 They are indeed in many places a 

 little separated, forming narrow en- 

 trances into the tube; but this may 



-tu 



Fig. 29. 

 (Genlisea omata.) 

 Utriculiferous leaf: en- 

 larRod about til recti iTies. be the result of the drying of the 



specimens. The lamina of which the 

 tube is formed seem? to be a lateral 

 prolongation of the lip of the orifice; 

 and the spiral line between the two 



I Upper part of lamina 



of leaf. 

 b Utricle or bladder, 

 n Neck of utricle. 

 o Orifice. 

 a Spirally wound nnns, 



with tlieir ends projecting edges is continuous with 



the corner of the orifice. If a fine 



bristle is pushed down one of the arms, it passes into the top 



of the hollow neck. Whether the arms are open or closed at 



their extremities could not be determined, as all the speci- 



