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PROCEEDING 8 OF THE NATIONAL MUSEUM. 



VOL. XXXV. 



Fourth abdominal segment with a dorsal sinus behind which is a 

 triangular prominence; infero-lateral angle of the second and third 

 segments acute; pleopods long. Uropods extending back to nearly 

 the same point, the first pair slightly exceeding the others, rami flat- 

 tened, armed on both margins with numerous short spines, narrowly 

 lanceolate in the first two pairs, broader in the third; nearly equal in 

 the first and third pairs, but in the second the outer ramus is about 

 one-fifth the shorter. Telson short, concave above, with a broad 

 rounded emargination at the tip. 



Length.— 9 mm. 



Localities. — Station 4423. off San Nicolas Island, 21G-339 fathoms. 



Type.— Cat. No. 38555, U.S.N.M. 



Fig. 43. — Stilipes distincta. mxp, maxilliped; p t , first peu/eopod; p t , fourth 

 per/EOPoi> ; t, telson; ur x , first uropou; iir-,., third urofod. 



I regret that but a single specimen of this species, and that a some- 

 what imperfect one, occurs in the collection. The ends of several of 

 the legs were broken off and the lower lip was somewhat mutilated 

 in removing it. The species is not closely allied to any of the recog- 

 nized families of amphipods. The posterior peraeopods resemble those 

 of the GEdicerotidas, but the mouth parts are markedly different. 

 The broad outer plate of the first maxilla' with its large number of 

 distal spines and the greatly expanded palp; the broad, rounded 

 plates of the second maxillae; and the diverging outer plates and 



