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U.S. NATIONAL MUSiEUM BULLETIN 271 



Boeckosimus, new genus 



Type-species: Anonyx edwardsii Kr0yer, 1846 (present selection). 

 This genus embraces those species formerly included in the genus 

 Onisimus Boeck, 1871, since the time of Sars (1895) and Stebbing 

 (1906). The genus Onisimus must include those species having gone 

 in the genus Pseudalibrotus Delia Valle, 1893, since the time of Steb- 

 bing (1906). Boeck (1876) designated Anonyx litoralis Kr0yer, 1845, 

 as type of Onisimus Boeck, 1871, and Pseudalibrotus Delia Valle 

 is a junior synonym of Onisimus because of monotypy, A. litoralis 

 also being the type-species of Pseudalibrotus. Sars (1895) designated 



Figure 125. — Lysianassidae: Upper lip-epistome complex, lateral view, left sides: a, 

 Socarnoides kergueleni Stebbing (1888); b, Tryphosites longipes (Bate and Westwood) 

 (Sars, 1895, pi. 28); c, Lysianassa plumosa Boeck (Sars, 1895, pi. 16, as L. costae); d, 

 Menigrates obtusifrons (Boeck) (Sars, 1895, pi. 38); e, Eurythenes gryllus (Lichtenstein) 

 (Sars, 1895, pi. 30);/, Orchomene batei Sars (1895, pi. 22); g, Ichnopus spinicornis Boeck 

 (Sars, 1895, pi. 15); h, Ambasia atlantica (Milne Edwards) (Sars, 1895, pi. 17, as A. dani- 

 elsseni); i, Lepidepecreum longicorne (Bate and Westwood) (Sars, 1895, pi. 38, as L. 

 carinatum); j, Orchomene amblyops Sars (1895, pi. 25); k, Nannonyx goesi (Boeck) (Sars, 

 1895, pi. 24); /, Orchomene minuta (Kr0yer) (Sars, 1895, pi. 24); m, Scopelocheirus crenatus 

 Bate (Sars, 1895, pi. 19); n, Hippomedon denticulatus (Bate) (Sars, 1895, pi. 20); o, Orcho- 

 mene obtusa (Sars, 1895, pi. 26). Lower lips: p, Hippomedon; q, Nannonyx; r, Normanion; 

 s, Eurythenes; i, Ichnopus; u, Opisa eschrichti (Krjziyer) (Sars, 1895, pi. 14); v, Trischizo- 

 stoma nicaeense (Costa) (Sars, 1895, pi. 12, as T. raschi). Upper lip, anterior view: w, 

 Acidostoma obesum (Bate) (Sars, 1895, pi. 14);;k:, Trischizostoma. 



