LOG 



G^iide to AracJiuida. 



Sub-order L— PANCTENODACTYLI. 



Table-case The members of this sub-order have the first appendage of 

 No. 24. small size, and the serrula of the movable finger is fused through- 

 out its length to the finger. 



There are three families : (1) Garypidae, (2) FeaeUidac, (3) 

 Chclifcridae. Specimens of a large species of Chelifer from Sierra 

 Leone are exhibited in Case 24. 



Sub-order II.— HEMICTENODACTYLI. 



The first pair of appendages of the Hcmictcnodactyli is of large 

 size, and at least the distal end of the serrula of the movable 

 finger is free. 



There are two families: (1) Chthoniidac, (2) Ohisiidae. 



Order 7.— Podogona. 



Owing to a close, but superficial resemblance to certain species 

 of Opiliones the Podogona were regarded, until quite recently, as 



forming part of that order. The 

 anterior of the two plates, which 

 form the cai-apace of the cepha- 

 lothorax (prosoma), is of small 

 size and forms a movable hood, 

 which covers the mouth and 

 first pair of appendages. The 

 palps are weakly chelate. A 

 movable membranous joint 

 unites the cephalothorax and 

 the abdomen, the genital aper- 

 ture opening upon the ventral 

 surface of this membrane. The 

 abdomen (opisthosoma) consists 

 of only four visible segments, 

 in addition to a tubular ring 

 encircling the anus. A striking 

 the position of the copulatory 

 at the end of each walking-leg 



of tlie third pair. A single pair of respiratory spiracles, which is 



situated towards the posterior end of the cephalothorax, is present. 

 A specimen of a West African species {Cnjptostcinma knrschi) 



(and also enlarged drawings of the species) are also exbibited in 



Table-case 24. 



Fig. 69. 



Diagram of a species of Cryptoatnnma, 



to show tlie characters of the 



Podogona. (x 4.) 



peculiarity of these animals is 

 organs, one of which is placed 



