U.S. NAlTIONAL MUSiETXM BULLETEST 271 



Figure 37. — Pleustidae: a, lower lip [see Calliopiidae]; b, accessory flagellum, absent or 



uniarticulate [see Liljeborgildae]; c, coxa 4, left aspect, posteriorly excavate [see Isaeidae 



and related families, Laphystiopsidae]; d, telson [see Liljeborgiidae, Eusiridae, Lepechinel- 



lidae]. 



Paramphithoidae and Lepechinellidae have one or more of coxae 1-^ cuspidate or pointed 



[Mesopleustes appears to be assignable to either Paramphithoidae or Pleustidae]. Oediceroti- 



dae have a disproportionately elongated pereopod 5 and short telson. Amphilochidae have 



a very small coxa 1. Laphystiopsidae may be synonymous with Pleustidae. 



