no. 1654. AMPHIPODA FROM WEST NORTH AMERICA— HOLMES. 535 



and second joints of subequal length and about four times as long 

 as the third ; secondary flagellum consisting of one elongate segment 

 and furnished with a few spinules. Second antennae with the last 

 basal joint about two-thirds length of preceding one; flagella of both 

 pairs with structures resembling calceolse. 



Last two thoracic segments produced posteriorly in the dorsal side 

 into a large acute tooth similar to those on the first three segments of 

 the abdomen. Last segment of the abdomen with a posterior acute 

 tooth in front of which is a prominence of variable size. Infero- 

 lateral angle of second and third abdominal segments acute. First 

 pair of side plates broadly rounded below, the following three pairs 

 with the infero-anterior angle produced and acute; the third pair 

 longer and more narrowly 

 produced than the others. 



First and second gnatho- 

 pods with narrowly ovate 

 hands of similar form ; 

 dactyl long and closing 

 against most of the length 

 of the evenly curved pos- 

 terior margins which is 

 armed with a series of 

 strong spines. Perseopods 

 of nearly equal length : 

 basal joints narrow, dactyls 

 rather long, half the length 

 of the narrow propodi, 

 smooth. Uropods reaching 

 back to about the same 

 point; peduncles of first 

 and second pairs reaching 

 back to the same point, those of the third extending a little farther; 

 rami slender, armed on both margins like the peduncles with numerous 

 short spines, the outer ramus slightly shorter than the inner. Telson 

 ovate, upper surface concave; a keel-like prominence on lower side of 

 base. 



Length. — 14 mm. 



Localities. — Station 4407, Santa Catalina Islands, 334-600 fathoms, 

 type, 10 + specimens ; station 4415, Santa Barbara Island, 302-638 

 fathoms. 



Type.— Cat. No. 38554, U.S.N.M. 



Family STILIPEDID^E, new. 



Antenna? devoid of accessory flagellum. Mandible with three- 

 jointed palp, molar tubercle small or absent. Lower lip with widely 

 diverging lobes. First maxilla? with narrow inner plate ; outer plate 



Fig. 40. — Acanthopleustes annectens. a\, 



FIRST ANTENNA ; md, MANDIBLE ; mX\, FIRST MAX- 

 ILLA ; mx 2 , second maxilla; t, telson; u.l, upper 

 lip; ur u first uropoda ; «r 3 , third uropod. 



