HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 181 



fiagellum of 11 segments, proximal 4 shortest, each with phimose seta 

 behind. 



Upper lip squarish, apical margin nearly straight, smooth. Lower 

 lip: outer lobes heavily pilose distally, inner lobes rather slender, 

 proximally acute. Mandible: incisor bicuspate on left, tricuspate on 

 right side, bicuspate lacinia on right, lacking on left, accessory blades 

 9-10; palp moderate, segment 3 shorter than 2, comb row with 20 

 stiff spines; 10-11 slender apical spines. Maxilla 1 : inner plate small, 

 margin with 11 branching setae; palp strongly arched, setae non- 

 plumose; accessory lobe small. Maxilla 2: outer plate short, broad, 

 inner margin proximally with about 20 slender spines and distally 

 with 10 plumose setae distally to apex. Maxilliped: inner plate with 

 10 slender inner marginal blades, outer plate nearly smoothly convex 

 on both sides; palp: narrow apical lobe of segment 2 small; segment 

 3 sharply geniculate, stem thicker than median lobe. 



Gnathopod 1 : posterior coxal angle sharply rounded bearing 4 

 plumose setae; segment 2 arched behind, distally setose; segment 5 

 nearly as long, expanded and heavily setose behind; segment 6 strong, 

 tumid, distally with long cleft-tipped setae; nail of dact}^ strong, 

 apical. Gnathopod 2: coxa similar to 1, angle with 6 plumose setae; 

 segment 2 slender, slightly arched, segment 5 subcylindrical, simple 

 setae behind; segment 6 similar to but slightly longer than in 

 gnathopod 1, dactyl conspicuous. 



Peraeopod 1 : coxa semilunate, acute posterior angle with 5 plumose 

 setae; segment 2 strong, plumose behind; segment 4 margins plumose; 

 segment 5, deep posterior lobe with cii'clet of 13 slender spines and 

 6 long weakly plumose setae; segment 6 broad spatulate, 16 marginal 

 spines. Peraeopod 2, coxa deep, smoothly convex below, posterior 

 sinus long; segment 2 short, sublinear; segment 4 rather broad, 

 margins plumose; segment 5: lobe circlet of 9-10 slender spines and 



5 setae; segment 6 drop shaped, 11 with marginal spines and 5 setae. 

 Peraeopod 3: coxal lobes subequal, hindlobe with oblique setose 

 posterior margin; segment 2 very broad, with short setose hind- 

 margin; segment 4 not wider than long, hindmargin with 4 spine 

 groups; segment 5 squarish; segment 6 linear, slender, distinctly 

 longer than 5. Peraeopod 4: coxal hindlobe steeply oblique, margin 

 setose; segment 2: hindmargin setose proximally; segment 4 short 

 and broad, with about 10 posterior spines and 4 facial rows of spine 

 clusters; segment 5 almost square, distal margin truncate; segment 



6 nearly as long, slender, with 4 posterior spine groups and terminal 

 clusters. Peraeopod 5: coxal plate broadly acuminate behind, lower 

 border with 4-5 stiff setae; segment 2 much broader than deep, 

 anterior margin proximally with plumose setae, distally with slender 

 spines, posterior margin nearly smooth; segment 4: posterior lobe 



