no.1654. A.MPBIPODA FROM WEST NORTH AMERICA -HOLMES. 541 



ments with a dorsal spine at the posterior end, those on the fourth 

 and fifth segments larger and more upturned than the others. In- 

 fero-lateral angles of first two abdominal segments with a small 

 tooth, those of the third segment produced and armed with several 

 teeth on the lower and posterior margins". Third uropods large, 

 with broad flattened nearly equal rami, with spinose margins. Tel- 

 son with a broadly triangular cleft, the lobes widely diverging, and 

 armed with a cluster of four or live spines at the tip, some of which 

 are very long. 



Length. — 12 mm. 



Locality. — Station 4417, Santa Barbara Island. 21) fathoms; Sta- 

 tion 44*20, off San Nicolas Island. 32—33 fathoms, female type; Sta- 

 tion 4431, off Santa Rosa Island, 38-45 fathoms. 



Type.— Cat. No. 38556, U.S.N.M. 



Family PIIOTID.K 



EURYSTHEUS DENTATUS, new species. 



Eyes rather small, round, on the projecting lateral lobes of the 

 head. First antennae over half the length of the body and rather 

 longer than the second; first joint of the peduncle nearly as long as 

 the second; third joint about three-fifths the length of the second; 

 flagellum a little shorter than the peduncle; secondary flagellum five- 

 jointed. Second antenme with the last two joints of the peduncle 

 subequal; flagellum larger than the last basal joint but shorter than 

 the last two. 



Mandibles with the last joint of the palp nearly as long as the pre- 

 ceding and slightly wider and furnished distally with numerous very 

 long setae. Lower lip with acute narrow posterior lobes. First 

 maxillae with the inner plate broad, the narrow tip turned inward and 

 furnished with four plumose seta 1 : outer margin with about fourteen 

 plumose setae; outer plate with ten spines: palp with about nine spines 

 on distal margin of elongated second joint. Second maxilla' devoid 

 of seta- on inner margin of inner plate, but having an oblique row of 

 seta' extending across the surface from the base of the inner side. 

 Maxillipeds with the terminal joint .obtuse, about twice as long as 

 wide ami scarcely half the length of the preceding one. 



First four pairs of side plates about as deep as broad, the firsi pro- 

 duced forward. First gnathopods rather -tout, smaller than the sec- 

 ond pair: hand about as long as carpus, about a half longer than 

 broad: the palm at an angle of about I.V to long axis, slightly longer 

 than the posterior margin, and having a stout spine at the end. In 

 the second gnathopods the hand is relatively longer, considerably 

 exceeding the carpus, the posterior margin longer than 1 the palm, 

 which has a largo spine near the end. First and second perseopods 



