TEA CHE ATA 



319 



but five, each of which in the last-named genus bears two 

 pairs of legs. The last segment of the antenna of Pauropus 

 bifurcates and bears three iiagella (Fig. 183). 



Soolopendrella, the genus which constitutes the sub-order 

 Symphyla, has obvious resemblances to certain members of 

 the most primitive sub-order of the Insecta, the Thysanura, 

 and in spite of the fact that no clear division of thorax and 



PlQ, 184. — Scolopendrella immaciiiata, 

 highly magnified. Slightly altered 

 from Packard. 



a. Caudal stylets. 

 b, b. First postoephalio appendages. 

 c. Antennae. 



One of the functional legs further 

 enlarged (from Wood Mason), 

 showing the iive joints and 

 terminal pair of claws. 

 b. Inner rudimentary leg of same 

 somite. 



abdomen exists, and that practically all the segments bear 

 legs, and there are only two pairs of mouth appendages, it 

 has been proposed to class this animal with the Thysanura. 

 Scolopendrella is but 5 or 6 mm. long; behind the head there 

 are fifteen terga, but only thirteen sterna exist, and twelve 

 pairs of legs ; the latter are five-jointed and terminate in two 

 claws (Fig. 184), as in Campodea, the genus of Thysanura it 

 most closely resembles. At their base is a small process 

 which gives the limb almost a biramous character. A pair 

 of caudal styles bear the apertures of certain silk glands. 



