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U.S. NATIONAL MUSEUM BULLETIN 271 



Figure 35. — Laphystiopsidae : a, mandible, note simple molar (general shape dififering 

 from that of Stilipedidae) [see Isaeidae and related families]; b, accessory fiagellum 

 [see Astyridae]; c, coxa 4, left aspect, of only type-genus; d,e, gnathopods 1, 2 (simple) 

 [see Oedicerotidae, Isaeidae and related families]; /, telson. 



One genus perhaps erroneously included here, see text. Probably a compound and artificial 



family. Lower lip resembling Pleustidae but type-genus Laphysiiopsis distinguished by 



having reduced coxae and simple gnathopods. Prolaphystius has elongated urosomite 1. 



Family scarcely distinct from Calliopiidae but Laphysiiopsis bearing large spatulate rostrum. 



See lower lip of Astyridae. Oedicerotidae usually have subchelate gnathopods, large coxae, 



and elongated peduncles of uropod 3. 



