34 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL, II 



called serridae, and finally they are the seat of important sense 

 organs. The serrulae have different forms in different species (fig. 

 II B, E, Ser), but characteristically the structures so called are thin 

 folds or more or less free appendages either indented along the outer 

 margin (C, Ser), or incised to form a comblike organ (E). The 



,-Ser 



Chelonethida. 



A, a pseudoscorpioii (probably Chelanops sp.), female, prosoma and append- 

 ages, ventral. B, same, right chela, dorsal. C, same, details of cheliceral 

 fingers, more enlarged. D, Atemnus sp., venom glands of pedipalp chela, with 

 duct opening near apex of movable finger (from Chamberlin, 1931). E, 

 ChtJionius sp., chelicera, sliowing silk gland with duct opening through spinneret 

 on movable finger (from Barrows, 1925). 



cheliceral silk gland, shown contained within the chelicera at E 

 of figure II (SlkGld), generally extends into the body cavity. There 

 may be a single duct opening through a simple papilliform spinneret 

 on the convex side of the movable finger (E, Spn), or there may be 

 several ducts opening separately through the prongs of a branched 



