9 



peduiu'lo or protopnditc hcariiio-* a stout many-joiuted 

 flugellum, which may correspond to the endopodite, and 

 Avliich is about the lengtli of the last two joints of the 

 pedun(de combined. This fiagellum bears a numl)er of 

 settc, some being' plumose, as Avell as two spines, on each 

 segment. In addition, on the upper margin of the distal 

 end of each segment is a calceolus (PI. I., fig. o, calc). 

 This is a cup-shaped, stalked piojection, witli a 1)eade(l 

 rim, within the body of which may be distinguished a 

 darker, curved mass, which Blanc (2) considers may be a 

 sensory nerve mass. Since, contrary to the belief of 

 earlier observers, calceoli are present on the antenna) of 

 females as well as males in G. pitlcx (thougli apparently 

 absent in female G. luci/Ma), Blanc (2) thinks they are 

 probably organs of hearing rather than of smelling or 

 clasping. (Jbservations of the behaviour of the antenna 

 during the chiming of a bell do not confirm this. The 

 first joint of the second antenna is enlarged and fits into 

 a notch in the cephalic ring. On its ventral surface it 

 bears the antcnnary cone (PL I., lig. 2, ant. c; PI. II., 

 ant. c), on the pointed apex! of wliich opens the duct of 

 the excretory (ugau, which occupies the basal joint of the 

 antenna. 



The mandibles (PL I., fig. 4:) each consist of a strong- 

 undivided protopodite bearing two jaws armed with 

 double rows of saw-like teeth (PL L, fig. 4, mn. t.) and 

 furnished in front and at the sides with, scooplike pro- 

 jections, which occupy the deep sinus between the lateral 

 corners of the cephalic shield (PL II.) and apparently aid 

 in holding up tlie food between the saw-like jaws. Each 

 mandible is provided with a three-jointed mandibular 

 palp, which is probably the endopodite, and is armed with 

 slanting rows of setse, projecting in three planes at right 

 angles to one another (PL I., hg. 4, mn. p.). 



