294 U.S. NATIONAL MUSEUM BULLETIN 271 



Liljeborgia Bate 



Iduna Boeck, 1861 (homonym, Aves). 



Liljeborgia Bate, 1862.— Stebbing, 1906.— K. H. Barnard, 1932. 

 Microplax Liljeborg, 1865 (homonym, Hemiptera). 

 Lilljeborgiella Schellenberg, 1931. 



Type-species: Gammarus pallidus Bate, 1857a (monotypy of Bate, 

 1862). See Bate and Westwood, 1863. 

 Species: 28, bipolar and amphiboreal, littoral to abyssal. 



Listriella J. L. Barnard 



Listriella J. L. Barnard, 1959b. 



Type-species: L. goleta J. L. Barnard, 1959b (original designation). 

 Species: 8, tropical and warm-temperate Atlantic and E. Pacific, 

 littoral, often inhabiting tubes of maldanid polychaetes. 



Lysianassidae 



Figures 117-132 



Diagnosis. — Accessory flagelkmi usually present and multiarticu- 

 late; article 3 of gnathopod 2 elongate (fig. 3a), gnathopod 2 other- 

 wise of the typical lysianassid kind and with a fuzz of scales or setules 

 on articles 5 and 6 (fig. 129) ; peduncle of antenna 1 short and stout. 

 See Sebidae, Ochlesidae, Stegocephalidae, Didymocheila (incertae 

 sedis) . 



Description. — Accessory flagellum usually present and more than 

 3-articulate but occasionally vestigial or few in segments; peduncle 

 of antenna 1 short and stout, articles 2 and 3 usually much shorter 

 than 1 and occasionally scarcely distinguishable because of tele- 

 scoping; pereon generally lacking processes, often urosomal segment 

 1 processif erous ; body compact, chitin usually very smooth, porcel- 

 lanous; mouthparts enormously variable, either chewing or piercing, 

 often with reduction in mandibular molars, variable in position of 

 mandibular palps; upper lip and epistome invaluable for identification, 

 either or both often produced in variable configurations; maxilla 1 

 generally with 2-articulate palp but occasionally reduced or absent; 

 maxilla 2 occasionally poorly developed; maxilliped occasionally with 

 reduced plates and palps; gnathopods usually quite small, 2 mitten- 

 shaped terminally, with article 3 elongate, article 5 generally ^^ith a 

 "pineapple cushion", i.e., posterior margin bulbous and with micro- 

 scopic texture of a pineapple, structure composed of scales or coarse 

 setules, article 6 generally covered with coarse setules or tasseled 

 setules; pereopods generally stout, occasionally prehensile; coxae 

 usually long, first one or two or three occasionally reduced in size or 



