NEW MARINE ISOPODS — MENZIES 151 



terior margin with a semiaciite median projection, which does not ex- 

 tend distally beyond the uropods. 



First antenna. — Peduncle composed of two joints, first joint about 

 twice the length and width of second and beset with a fringe of scales 

 on lateral margin and a stout spine at anteromedial edge; second joint 

 with scales on lateral margin, medial margin smooth. Flagellum with 

 three subequal joints, last joint with two elongate sensory filaments and 

 a few setae at tip. 



Second antenna. — ^About as long as cephalon. Pedvmcle composed 

 of six joints; first three joints partially fused, fourth joint deeply im- 

 mersed in third joint, fifth joint about two times the length of third 

 and beset with a fringe of flat scales on the lateral and spinelike scales 

 on the medial margins, sixth joint as long as third. Flagellum about 

 one-half the length of peduncle, composed of six joints; first joint 

 about twice the combined lengths of following five joints, inner mar- 

 gins of all joints setiferous. 



MaocilUped. — ^With three coupling hooks. Palp composed of five 

 segments; second joint expanded, being about one-half the width of 

 endite and possessing a produced bidentate inner distal angle; last 

 three joints considerably narrower than second joint. 



First maxilla. — Outer lobe with 11 denticulate setae at apex, inner 

 lobe with three apical setae. 



Second maxiUa. — Each of the two outer lobe lappets with four 

 apical setae, inner lobe with four apical setae. 



Mandible. — Left and right mandibles similar, lack lacina. Incisive 

 part with five teeth, setal row with 10 setae, molar process fingerlike. 

 Palp composed of three subequal joints, second joint with three spinu- 

 late setae on distal half, third joint with eight spinulate setae. 



First peraeopod. — Dactylus with two claws, propodus with three 

 2-pointed setae on inferior margin, merus and ishium with projecting 

 scales on superior border. 



Seventh peraeopod. — Dactylus with three claws, propodus inferior 

 border with four 2-pointed setae. Projecting marginal scales on dor- 

 sal border of ishium and distal border of basis. 



Other peraeopods. — Similar to seventh in having three claws on 

 dactyls. 



Uropod. — Peduncle composed of a thick joint having a large medi- 

 ally curved spine at distal end on medial margin ; medial margin of 

 peduncle spinulate. Endopodite cylindrical, composed of a single thick 

 joint beset with a circle of long setae at tip. Expedite consisting of 

 two short joints, a minute, scarcely discernible basal joint, and a 

 nodiform distal joint whose tip bears a number of long setae. 



Pleopods. — First male pleopods with produced, truncate postero- 

 lateral angles and a medially produced setiferous distal border. Fe- 

 male operculum pyriform, apex setiferous. 



