TITANOSOMA AND POLYMICRODON IN ENGLAND 1 47 



tempted to regard the horn-shaped telopodltes of the anterior 

 gonopods as a step towards the telopodites of Mastigophoro- 

 phyllon and its relatives, as indeed in a restricted sense they 

 are. That we have not, however, to do with an actual 

 phylogenetic development is abundantly evident from the 

 central fusion of the anterior gonopods of Brachychaeteuma. 



Any close relationship of our genus with the families of the 

 Trachysomidas, Chordeumidae, Orobainosomidae, Verhoeffiidae, 

 Neoatractosomida?, Heterolatzeliidae and Craspedosomidas can 

 be definitely said to be excluded. 



BRACHYCHAETEUMA, n.g. 



Ocelli altogether absent. Body white, without pigment. 

 The processes (X. 3) (verrucce fisscz) on the lamellas linguales 

 near the central body are three-pointed. 1 In addition to the 

 two pairs of prominent sense organs on the inner palpus, a third 

 is only feebly indicated. 2 The labrum of the male, in addition 

 to the usual three middle teeth, is further characterised by a 

 notch on the anterior edge, so that it appears to be divided 

 into four points (X. 2). The anterior pleurite of the head, 3 

 which projects outwardly, possesses on the underside a rib 

 which is plainly toothed for its whole length (X. 1); the 

 serration is especially conspicuous in the anterior third. 4 

 Third to fifth pairs of legs in the male somewhat thickened. 

 On the pleurotergites of the abdomen the prozonites are 

 strongly reticulated, the metazonites for the most part smooth ; 

 the neighbourhood of the small prominence is rather roughened. 

 On the anterior side of the posterior gonopods arises a longi- 

 tudinal rib which extends over the region of the coxa and pre- 

 femur (IX. 2, k). 



1 In the Orobainosomidcz I found them four-pointed. 



2 The Orobainosomida: possess 4 + 4 prominent sense organs on the 

 inner palpi. 



3 In reference to the head-pleurites of the Diplopods I would refer to 

 the third volume of my " Diplopoden Deutschlands," 1911-12. 



4 In the Orobainosomida this rib is only faintly striated, not serrated. 



