142 PROCEEDINGS OF THE NATIONAl, MUSEUM vol. loi 



spine. Epimeral plates of somites 2 to 7 distinctly separated from 

 somites and visible in dorsal view. Second to sixth epimeral plates 

 with an epimeral spine at posterior angle; spine of seventh located 

 anterior to posterolateral angle of the epimeron and smaller than 

 those on the other somites. Epimeral spines largest and longest on 

 the third somite. Epimeral plates each with a large seta anterior to 

 epimeral spine. First peraeon somite with posterolateral edges 

 broadly curved. 



Pleon. — Composed of a short anterior somite and a bulbous pleotel- 

 son which bears a distinct constriction slightly posterior to first pleon 

 somite. Lateral margins of pleotelson with a few setae. 



First antenna. — Located on lateral margin of cephalon and very 

 slightly posterodorsal to second antenna insertion. Peduncle com- 

 posed of two long subequal segments. Flagellum composed of four 

 segments, first two subequal in length and together equal the length 

 of fourth. Fourth flagellar segment with a single long sensory fila- 

 ment and a few smaller setae at apex. It is difficult to tell where the 

 peduncular segments stop and the flagellar segments commence. I 

 have considered the last four segments as flagellar segments primarily 

 because they differ from one another very slightly and are conspicu- 

 ously narrower than the other segments. 



Maxllli'ped. — ^With two coupling hooks. Palp with five segments, 

 first three as wide as endite, last two one-half the width of third 

 segment. 



First maxilla. — Outer lobe with seven stout setae, inner lobe with 

 three setae. 



Second 7naxilla. — Each of the two outer lobe lappets with three or 

 four denticulate setae at apex. Inner lobe with five setae. 



Mandible. — Incisive process consisting of a double row of five small 

 teeth; setal row with two spinelike setae. Molar process sword- 

 shaped, having a single apical seta. Palp and lacina lacking. Left 

 and right mandibles similar. 



Gnathopod. — Those of male and female similar. Dactylus with 

 two claws, propodus with two large setae on inferior margin, carpus 

 with four 2-pointed setae on ventral margin and a spinelike process 

 at the triangulate apex of inferior margin. 



Other peraeopods. — All similar and spindly. Seventh peraeopod 

 dactylus with two long narrow claws ; dactylus exceeds one-half the 

 length of propodus ; prodopus with three 2-pointed setae on inferior 

 border, carpus with two 2-pointed setae on inferior border. 



Uropods. — Two-branched, similar to those of the other species in 

 the genus. 



Pleopods. — Male first pleopods medially fused, posterior margin 

 less pointed than is usual in the genus. Operculum of female pyri- 

 form, apex pointed, lateral borders setiferous. 



