080 chilo(;natiia. 



1863. Plate vi, fig. 58-01) ai'c arraiigt'd miuli as in S. margi- 

 natus. It differs remarkably, however, in the raised j)osteri(;r 

 margin of the segments, giving a serrate outline to the hody. 

 In this respect it seems to combine the characters of the pres- 

 ent family and that of tSjjirostrephon, a genus in many 

 respects intermediate between the Polydesinidm and the 

 Sijyiionantia. Four spiracles are represented on the tenth to 

 the thirteenth segments from the head. 



The genus Sinrostreplioii is in many respects intermediate 

 Ijetween this and the succeeding family, the sterna being soft, 

 as in the Siphonantia. S. Cop>el Pack, was found by Mr. C. 

 Cooke in Mammoth Cave. 



Siphonantia Brandt. In the sucking Myriopods {Sugaiitia 

 of Brandt) we meet with the lowest, most worm-like forms of 

 the sub-class. The head is very small and concealed beneatli 

 the prothoracic ring. The parts of the mouth are fused and 

 united into a sucking tube for the imbibition of fluids. The 

 eyes are either present or absent, and the scuta, or tergites, 

 may be prolonged laterally into lamina? which afford protec- 

 tion only to the back and flanks, the central part of the abdo- 

 men being soft. The feet aie small and hidden beneath the 

 broad body, while the male appendages are placed on the 

 seventh segment. In Oetoglena the eight eyes are arranged 

 in two converging rows. O. hlvirgata Wood is brown, with a 

 reddish stripe on each side, with about forty-flve segments to 

 the body. In JSrachycyhe tlie rostrum is acute, much shorter 

 than the antennae, while the body is broad and flattened. 

 Brachycyhe Lecontei Wood inhabits Geoi'gia, and has long 

 lateral expansions to the tergites. 



PERIPATIDEA. 



This group is perhaps equivalent and allied to the Myrio- 

 poda, with some affinities to the Tardigrades, Peripatus lias 

 numerous pores or stigmata, from Avhich fine tracheae a)is(\ 

 The body and appendages are not jointed, the thirty pairs of 

 legs ending each in two claws. F. Edwardsii inhabits 

 Venezuela. 



