146 PROCEEDINGS OF THE NATIONAl, MUSEUM vol. loi 



First antenna. — Peduncle composed of two wide joints, the first 

 being two times the width of second. Flagellum composed of three 

 joints, first two joints siibequal in length and together about equal 

 the length of last joint. Last joint with a single long sensory fila- 

 ment and a few setae at tip. 



Second antenna. — Peduncle composed of six segments. First four 

 segments subequal in length, fifth about two times the length of prior 

 four and slightly longer than sixth segment. Flagellum as long as 

 peduncle and composed of 10 segments. Antennal scale not observed. 



Maxilliped. — ^With two coupling hooks. All five joints of palp of 

 similar width, last two being slightly narrower than the first three; 

 third joint about one-fourth the width of endite. 



First maxilla. — Outer lobe with eight denticulate setae at apex and 

 a few marginal setae. Endite with four apical setae. 



Second inaxiUa. — Each of the two outer lobe lappets with four den- 

 ticulate apical setae. Inner lobe with five ciliate setae at apex and 

 numerous fine marginal setae. 



Mandible. — Palp not observed. Left mandible molar process 

 cylindrical, with truncate, unidentate, setiferous apex; incisor 

 process and lacina with four teeth ; setae row with two wide dentate 

 setae followed by three narrow setae. Right mandible similar to left 

 but lacking a lacina and having a large lacinoid seta followed by four 

 smaller setae in setal row. 



First peraeopod. — Dactyl with two claws. Propodus with a single 

 2-pointed seta and four narrow setae on inferior margin behind which 

 are three pectinate scales. Carpus with a large 2-pointed seta at 

 inferodistal angle behind which is a thick-toothed pectinate scale; 

 a smaller 2-pointed seta present on inferior margin proximal to the 

 large one. Merus wdth a large seta at superodistal angle. 



Other peraeopods. — Dactyls with two claws. Seventh peraeopod 

 with two 2-pointed setae on inferior propodal margin and five setae on 

 carpal inferior margin. 



TJropod. — Peduncle joint widest at distal end. Inner and outer 

 branches about equal in length being slightly shorter than peduncle 

 and possessing blunt ends. 



Pleopods. — First male pleopods not widened distally, with blunt, 

 paucisetiferous tips. Second male pleopod outer lamellar plate with 

 an acute apex ; inner stylif orm proximal branch originating at middle 

 of medial margin of outer branch slightly curved and extend- 

 ing to tip of outer branch ; inner distal branch short, with blunt tip 

 and in contact with proximal branch near its origin. Third male 

 pleopod inner branch with three plumose setae on distal margin. 

 Female operculum with truncate apex on either side of which is a 

 fairly large seta. 



