132 U.S. NIATIONAL MUSElUM BULLETIN 271 



Byblisoides K. H. Barnard 



Byblisoides K. H. Barnard, 1931, 1932. 



Type-species: B. juxticornis K. H. Barnard, 1931 (original 

 designation) . 



Pereopod 5 with posterior lobe of article 2 greatly expanded distally, 

 posterior edge oblique, anterior edge of posterior lobe lacking setae 

 near its junction with article 3; palp article 3 of mandible shorter than 

 article 2; antenna 2 with less than five flagellar articles; anteroventral 

 corner of head produced. Species: 4, tropics to antarctic, bathyal. 



Haploops Liljeborg 



Haploops Liljeborg, 1856. — Stebbing, 1906. 



Type-species: H. tubicola Liljeborg, 1856 (original designation). 

 See Sars, 1895. 



Pereopod 5 with posterior lobe of article 2 not expanded distally, 

 usually narrow, posterior edge vertical, anterior edge of posterior lobe 

 bearing setae near its junction with article 3; palp article 3 of mandible 

 as long as article 2; antenna 2 with more than five flagellar articles; 

 anteroventral corner of head unproduced. Species: 13, cosmopolitan, 

 cold-water, littoral to abyssal, primarily bathyal. 



Triodos K. H. Barnard 



Triodos K. H. Barnard, 1916. 



Type-species: T. insignis K. H. Barnard, 1916 (monotypy). 



Pereopod 5 with posterior lobe of article 2 greatly expanded distally, 

 posterior edge oblique, anterior edge of posterior lobe lacking setae 

 near its junction with article 3; palp article 3 of mandible as long as 

 article 2; antenna 2 with more than five flagellar articles; anteroventral 

 corner of head produced. Species: 1, S. Africa, littoral. 



Amphilochidae 



Figures 59, 60 



Diagnosis. — Accessory flagellum absent; coxa 1 very small, par- 

 tially hidden by following coxae. See Pleustidae, Calliopiidae, Leuco- 

 thoidae, Anamixidae, Stenothoidae, Thaumatelsonidae, Cressidae, 

 Stegocephalidae. 



Description. — Accessory flagellum absent; rostrum conspicuous; 

 coxa 1 very small in all but one genus and partially hidden by fol- 



