Francis E. Lloyd — 282 — Carnivorous Plants 



lo, ii), but physiologically the traps behave differently, there being 

 three sets, one growing downward, one growing laterally and one up- 

 ward {20 — 9). 



There are still other varieties of traps displaying various permu- 

 tations of size and shape of the appendages. So far as known these are 

 represented in plate 35. 



Lastly the genus Polypompholyx {36 — ■ 1-9), the trap of which was 

 described with respect to the entrance mechanism on p. 257. It has a 

 very special form in this genus (there is little variety), in which the 

 stalk plays a special part of the approach to the door. 



The form of the trap and a number of anatomical details were 

 described by F. X. Lang in 1901 from material in the Goebel collec- 

 tion, which I examined later. 



The traps are of various sizes, the largest measuring 4 mm. in 

 length. For the most part they are smaller, about 1.5-2 mm. In one 

 species (possibly P. latifolia, though Bentham did not admit this 

 species) the traps are dimorphic both in size and structure {36 — 8, 9). 

 In all the species (probably four) they present the following characters. 

 Viewed from above, the body of the trap is seen to be roundly trian- 

 gular with a forked rostrum in front and a broad wing on either side. 

 The margins are entire but carry stiff hairs. The fork of the rostrum 

 is seen to clasp the stalk, over which the whole forward part of the 

 trap is incHned. The top of the trap body is almost fiat — this is the 

 upper side of the three sided body. Seen from below the trap body evi- 

 dently has two. lateral faces, from the upper angles of which the 

 wings extend. The stalk, which now hides the rostrum, gradually 

 swells on its approach to the trap, and is molded into two low 

 ridges, one on each side, just before the insertion is reached. These 

 ridges are strongly ciliated, forming guiding fences directing prey to 

 the entrance of the trap, which is approached only laterally because of 

 the contact of the rostrum on the stalk. The wings complete two 

 funnel effects, one on each side. Viewed now from the side the stalk 

 is seen to be increasingly massive as it approaches the trap, and this is 

 due to a large intercellular space which inflates the lower moiety 

 below the rostrum. The upper half is expanded into a ridge which 

 becomes deeper under the rostrum, then to be reduced. The loss of 

 height is, however, compensated for by a comb of stiff hairs with long, 

 tapering capitals, and their ends curiously distorted (Lang) as if bent 

 during development by impinging against the rostrum. This ridge 

 being tightly pressed against the rostrum divides the approach to the 

 door into two lateral vestibules, so that the prey must advance under 

 the wings from behind, to be diverted by the combs of bristles on the 

 sides of the stalk toward a space beneath the rostrum. This space has 

 the wall of the trap for its floor and the rostrum and door for its 

 roof, and is an antechamber leading to the entrance proper. Its floor 

 is clothed with mucilaginous hairs with long whip-lash capitals, lying 

 pointed toward the entrance. The roof, which is chiefly the door, 

 bears similar hairs, longer toward the door insertion, shorter toward 

 its free edge. The entrance is a small semi-circular hole in the trap 

 wall, which stands at a steep angle with the floor of the antechamber. 

 The semicircular edge of the entrance is clothed with pavement epi- 



