410 Mr. L. J. Cole on Ten-legged Pycnogonids. 



disposing of Pent any mphon, which will be taken up again. 

 These relationships are expressed more graphically in the 

 following diagram :— 



PYCNOGONOMORPHA,. 



Pycnogonidae. 



PhoxichilidflB. 



Phosichilidiidffl. COLOSSENDEOMORPHA. 



\ Pasithoidae. 



Hannonia. 



\ 



PallenidsB. 



\ AmmotheidaB. 



NymphonidsB. / 



' EurycydidsB. 



Pentanymphon. 



Becolopoda. 



In the table I have indicated the division of the families 

 into orders as arranged by Sars. Lankester (1904) makes 

 practically the same grouping, but employs different names. 

 I can see no valid reason for a division into Achclata and 

 Euchelata(or into Pycnogonomorpha and Nymphonomorpha, 

 as given by Lankester), a distinction based on the absence of 

 a single pair of organs (the chelifori) in the former group, 

 since the palpi are absent or rudimentary in the Pallenidae, 

 and in the Phoxichilidiidee the ovigera are present only in 

 the male. A reference to the table will show that there is 

 no place in this series where a line can be drawn based on a 

 number of characters — in fact, not more than a single one of 

 the characters given changes at any given point in the series. 

 It therefore seems best to make but two orders, representing 

 the two divergent series. These can well be designated by 



