270 



U.S. NATIONAL MUSEUM BULLETIN 2 27 



Proboscis with a pair of broad, black, toothed mandibles, articulated 

 medially (fig. 7 Id). Maxillae with very long, filamentous, separate 

 maxillary carriers and an unpaired piece. Maxillae i large, hooked, 

 denticled at base, right and left pieces slightly asymmetrical with 

 8-11 teeth; maxillae ii distinctly asymmetrical, left one smaller, with 

 6-8 teeth, right one larger with 12-14 teeth; maxillae iii and iv 

 similar, each with denticled margin with 4-7 teeth and 2 divergent 

 supporting wings; maxillae v each with a single tooth (fig. 71e; v on 

 one side may be absent, according to Moore). Color: reddish, 



Figure 7L — Arabellidae, a-e, Arabella tricolor {d-e, Moore, MS.): a, dorsal view anterior 

 end; b, middle parapodium, anterior view; c, limbate setae from middle parapodium; d, 

 mandibles, from above; e, maxillae, under slight pressure so that the accessory plates are 

 turned to one side. f--g, Drilonereis caulleryi: f, middle parapodium, anterior view; g, 

 maxillae, dorsal view, h, Drilonereis magna, parapodium (after Webster and Benedict, 

 1887). 



