1 62 DR. K. W. VERHOEFF ON BRACHYCHAETEUMA, 



projections, on to the interior of which the points extend more 

 or less, but there is a single long process sharply marked off 

 from the section bearing the awns. The most important 

 difference lies, however, in the structure of the syncoxite, the 

 peculiarities of which may be appreciated from pi. X., fig. 5. 

 The coxites of Poly micro don, precisely because they are united 

 into a syncoxite, give one a very different impression according 

 as they are looked at from in front or behind or in profile. Fig. 

 5 shows the syncoxite from almost exactly behind, so that it 

 is easy to recognise that a complete union between the two 

 halves has taken place in the middle line right to the base of 

 the long distal processes. The syncoxite ends in a rounded 

 median flap (e), and basally also there is a small flap (/) to be 

 observed between the processes. By suitable preparation it is 

 possible to tear apart the halves of the syncoxite ; one can 

 then recognise at the base of the distal processes the spot at 

 which the two halves have been torn asunder (X. 4, x). 



The hinder gonopod-sternite and the vestiges of the hinder 

 gonopods I have figured for latzeli gallicum in the Archiv f. 

 Nat., 1896, plate 14, fig. 63. I can here only state that this 

 figure represents the corresponding organs of the specimens 

 from the North of England almost perfectly. This hinder 

 gonopod-sternite, together with the remains of the gonopods, 

 differs from that of Macheiriophoron in the absence of a 

 median sternal spine and the absence of coxal spines. The 

 sternite is proportionately altogether more developed, and the 

 remains of the gonopods are weaker, being embraced both 

 internally and externally by portions of the sternite. In place 

 of the median sternal spine there is in Polymicrodon a large 

 median saddle-shaped process, that is to say, a broad process 

 which is divided into two lateral processes by a deep excava- 

 tion in the middle. External processes of the sternite embrace 

 the gonopod-knobs from without and rise up in the form of 

 pegs ; their ends are somewhat hooked over towards the 

 exterior. The hinder gonopods are therefore, in comparison 

 with those of Macheiriophoron, much less developed ; they 

 either form a mere rounded knob upon the end of which a 





