ANCEUS HAJJDAII. 2Q7 



strongly defined coloration which his figures represent, 

 but the outer pair of foot-jaws in the male of that 

 species are formed of a large lunate exarticulate mass. 

 The only other species, A. brivatensis, which M. Hesse 

 describes as belonging to his first section (to which our 

 Irish species seems to be referable), differs in the much 

 broader head and in the strongly angulated sides of the 

 two anterior segments of the body. Moreover, his 

 figure of the underside of the male of A. brivatensis 

 shows the outer foot-jaws as of so small a size as not 

 closing the mouth, and " formee d'une lame large ter- 

 minee a son extremite par un petit appendice ovale 

 et cilie." 



In this indecision we have thought it more advisable 

 to propose for this Irish species the name of the gen- 

 tleman by whom it was discovered, and by whom so 

 many interesting additions, in different tribes of annulose 

 animals, have been discovered and most satisfactorily 

 investigated. 



