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U.S. NATIONAL MUSEUM BULLETIN 271 



minate, coxae 1-3 quadrate; gnathopod 1 simple; telson oval, short, 

 entire. Monogeneric. See Laphystiopsidae, Acanthonotozomatidae. 



Description. — Accessory jElagellum absent; body broad, not carin- 

 ate, urosomite 1 elongate; rostrum large, mouthparts arranged into a 

 conical bundle; mandible lacking molar and spine row; lower lip lack- 

 ing inner lobes; palp of maxilla 1 reduced to a single article; palp of 

 maxilliped reduced to two small articles; coxae 1-3 quadrate, coxa 4 

 acuminate; gnathopods feeble, 1 simple, 2 weakly subchelate; uro- 

 pod 3 biramous; telson small, oval, entire. 



Relationship. — This family is so closely related to Acanthonoto- 

 zomatidae that they might be joined together as subfamilies. 



The Laphystiopsidae bear a 4-articulate maxillipedal palp, a man- 



FiGURE 110. — Lafystiidae: Lafystius sturionis Kr0yer (Sars, 1895, pi. 134): a, lateral; 

 b, dorsal view of head; c, upper lip; d, mandible; e, lower lip;/,g, maxillae 1, 2; /j,maxilliped; 

 i,j, gnathopods 1, 2; k. uropod 3; /, telson. 



