ss APPENDAGES ASS 
projection, the “ galea,” arising at its base, and extending beyond 
the jot in front. In the Obisiinae it is only represented by a 
slight prominence. 
Two other organs characterise the chelicerae of all the 
Chernetidea; these are the “serrula” and the “ flagellum.” 
Their minute size and transparency make them very difficult of 
observation, and for a long time they escaped notice. The 
serrula is a comb-hke structure attached to the inner side of the 
distal joint. The flagellum is attached to the outer side of the 
basal joint, and recalls the antenna of a Lamellicorn beetle, or the 
“pectines” of scorpions, a resemblance which gave rise to the 
supposition that they are olfactory organs. It is more likely, 
however, that they are of use in manipulating the silk. 
The pedipalpi are six-jointed and are very large, giving these 
animals a superficial resemblance to scorpions. According to 
Simon,’ the patella is absent, and the joints are coxa, trochanter, 
femur, tibia, tarsus, with an apophysis forming the fixed digit of 
the chela, while the sixth joint is the movable digit, and is 
articulated behind the tarsus. These joints, especially the 
tarsus, are often much thickened, but however strongly de- 
veloped, they are always narrow and pediculate at the base. 
The coxae of the pedipalps are closely approximated, and are en- 
larged and flattened. They probably assist in mastication, but 
‘there is no true maxillary plate articulated to the coxa as in 
some Arachnid groups. 
The legs are usually short and feeble, and the number of their 
articulations varies from five to eight, so that it is not easy to 
be certain of the homologies of the individual joints to those of 
other Arachnids, The coxae are large, and form the floor of the 
cephalothorax. They are succeeded by a short trochanter, which 
may be followed by another short joint, the “trochantin.” Then 
come the femur and tibia, elongated joimts without any inter- 
posed patella, and finally the tarsus of one or two joints, ter- 
minated by two smooth curved claws, beneath which is situated 
a trumpet-shaped membranous sucker, 
Internal Structure.—The internal structure of the Cherne- 
tidea, as far as their small size has permitted it to be made out, 
bears a considerable resemblance to that of the Phalangidea. 
1 4Arachnides de France, vii., 1879, p. 5. 
2 See Bernard, J. Linn. Soc. xxiv. (Zool.), 1893, p. 410. 
VOL. IV 2F 
