21, d) - such as may be noticed in the majority of the Lepidoptera - whose appendages are closely and immovably pressed to the body by a general hardening and fusion of the cuticle.
Appendages of 2nd pair folding in a horizontal plane, completely chelate, the claw immovably united to the sixth segment.
Remaining pairs of appendages with their basal segments immovably fixed to the sternal surface, similar in form, the posterior three pairs furnished with two claws supported on long stalks; the basal segments of the 6th pair bearing five pairs of tactile sensory organs or malleoli.
The prosoma and opisthosoma were broadly confluent and probably immovably welded together.
The under jaws are hinged on to the quadrate bones, which extend obliquely backwards, and are immovably wedged in between the squamosal and the lateral occipital wings.