A SYNOPSIS OF THE BRITISH PAUROPODA 657 



b. Species shorter, 0"6 to 0'7 mm. Anal plate with its 

 lateral margins continued directly in the outer lateral 

 margins of its branches ; outer branches long and 

 slender, diverging considerably ; inner branches 

 obsolete. Styli slender and larger than the outer 

 branches of the anal plate. Upper antennal branch 

 scarcely longer than the lower. Former extremely 

 slender. P. gracilis, Hansen. 



Pauropus huxleyi, Lubbock (Plate xix., figs. 12 and 19). 



This is the only European species of the first chief group, 

 and easily distinguished by the characters named in the table ; 

 it is a larger species than any of the others, and the long hind 

 legs give it a distinctive appearance when examined under a 

 lens in the field. 



Since recording it from the Derwent Valley, I have taken 

 another solitary specimen from under a stone lying in a field 

 on the banks of the Wear near Hylton, March, 1910. 



Pauropus danicus, Hansen (Plate xix., figs. 13, 20-1). 



Hansen, Vidensk. Medd. fra den Naturh. Foren., 1901, 

 figs. 376-378, pi. iii., figs. 4a-4f. 



Although Professor Hansen only had a single rather badly 

 preserved specimen of this distinct species, he has described 

 and figured it with singular minuteness. On February 19th 

 of this year I was fortunate enough to discover two male 

 specimens in the Sunderland Winter Gardens, both of which 

 agreed in every detail with Hansen's description oi F. danicus. 

 The antennal globulus is very small, and placed upon an 

 extremely short stalk, whilst the hair on the anterior margin 

 of the lower antennal branch is not much shorter than the 

 anterior flagellum, the latter being but two-fifths the length of 

 the posterior flagellum. The tactile setae are more than 

 usually long, and taper from middle to tip, whereas in 

 P. gracilis they broaden for two-thirds their length, and from 

 thence scarcely taper. 



