HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 179 



Upper lip very broad, apically rounding and smooth. Lower lip: 

 inner lobes moderately long, apex broad, subtruncate. Mandibular 

 incisor simple, lacinia small, unicuspate; accessory blades about 10. 

 Palp long, slender, comb row of about 30 short spines, apex with 10 

 slender spines. Maxilla 1: inner lobe small, margin with about 15 

 forked setae; palp broadest at apex, with simple and plumose setae, 

 accessory lobe large. Maxilla 2: outer lobe with short inner margin, 

 proximally armed with about 16 pectinate spines and distally with 

 about 25 plumose setae. Maxilliped: outer plate relatively narrow, 

 palp narrow, distal lobe of segment 2 nearly attaining transverse 

 margin of short geniculate segment 3. 



Gnathopod 1: posterior coxal angle acute, margin with 6 plumose 

 setae; segment 5 elongate, lower margin heavily setose; segment 6 

 slender, slightly arched; dactyl small, nail short, apical. Gnathopod 

 2: posterior coxal angle with 8-10 plumose setae; segment 2 long and 

 slender; segment 5 nearly equal in length, narrow, posterior margin 

 richly setose; segment 6 very slender and moderately arched, dactyl 

 minute. 



Peraeopod 1: coxa lunate, posteriorly setose; segment 2 powerful, 

 plumose behind ; segment 4 broadening distally, margins lightly setose ; 

 segment 6: broad posterior lobe armed with circlet of 12 short slender 

 spines and 10-12 plumose setae; margin of spatulate segment 6 with 

 about 18 slender spines. Peraeopod 2: coxa somewhat broader than 

 deep, shallow sinus weakly setose; segment 2 short, stout; segment 

 4 powerful, margins convex; segment 6 short and deep, lobe circlet 

 with 8 spines and 6 setae; segment 6 oval, nearly ringed with slender 

 spines and a few plumes proximally. Peraeopod 3: coxal lobes 

 shallow, subequal, segment 2 much broader than deep, sparsely setose 

 behind; segment 4 broad, posterior margin truncate with about 5 

 spines and numerous long plumose setae; segment 5 narrower; segment 

 6 linear with 5 anterior spine clusters. Peraeopod 4: posterior coxal 

 lobe deep, lightly setose; segment 2 slightly expanded, narrowing 

 distally; segment 4 very long, margins subparallel, 4 rows of facial 

 spine clusters; segment 5 longer than wide, anterior margin narrowing 

 distally; segment 6 about equal to 5, slender, with 4 posterior spine 

 clusters. Peraeopod 5: coxa with squarish posterior lobe; segment 

 2 very broad and orbicular, posterior margin bare; segment 5 sub- 

 rectangular, posterior margin sharply truncate, with 2 heavy spines; 

 segment 5 distally broadest, posterior margin very short, with 1 

 spine group; segment 6 nearly as long and quite broad, 5-6 spine 

 clusters on each margin. Coxal gill of gnathopod 2 much the largest. 



Pleosome side plate 3 shallowly convex, rounded behind, with 7 

 lateral clusters of setae. Pleopods: peduncle very broad and short, 

 rami slender, inner 15-segmented, outer much longer and 24 segmented 



