HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 187 



small, conical; 5 accessory blades; palp short, segment 2 very stout, 

 margins setose; terminal segment subequal, with 8-9 short comb 

 spines and 10-11 slender apical spines. Maxilla 1: inner lobe large, 

 9 bifid marginal setae; outer lobe small, palp short, apical cluster 

 with simple and plumose setae; accessory lobe large, setae long. 

 Maxilla 2: outer lobe broad lunate, outer margin pilose, inner margin 

 proximally with nearly 20 pectinate slender spines and distally with 

 nearly 30 plumose setae; inner lobe rather broad. Maxilliped: inner 

 plate relatively large, narrowing distally, apex with about 4 slender 

 blades and short prominence with 2 unequal spme teeth; outer lobe 

 with strongly convex outer margin; palp: inner margin of segment 2 

 convex, segment 3 short, geniculate, medial lobe short. 



Gnathopod 1 : coxal plate subrectangular, rounding distaUy, poste- 

 rior angle with a plmnose seta(?); segment 2 rather strongly arched, 

 posterior margin richly setose; segment 5 stout, lower marginal 

 setate simple and cleft tipped; segment 6 shorter, sublinear, marginal 

 setae cleft tipped; dactyl with long stout nail. Gnathopod 2 with 

 2 plumose setae at squared posterior corner; segment 2 straight, 

 setose behind; segment 4 slightly expanded below (behind), proximaUy 

 with simple and cleft-tipped setae, distaUy with about 12 pectinate 

 spines; segment 6 rather short, both margins convex, dactyl small. 



Peraeopod 1 : coxal plate arcuate, posterodistal angle acute, with 1 

 long seta; segment 2 stout; segment 4 expanding distally, margins 

 with plmnose setae; segment 5 with circlet of 10 lobe spines; segment 

 6 with 11 marginal spines. Peraeopod 2 smaller and weaker, coxal 

 plate broadly rounding to blunt posterior process; segment 2 short, 

 narrow, setose behind; segment 4 moderately expanded, a few plumose 

 setae anteriorly, simple setae posteriorly; segment 5 and 6 with 4 and 

 2 long plumose setae on posterior lobes respectively. Peraeopod 3: 

 coxal plate very broad, lobes subequal, margins nearly smooth; 

 segment 2 broadly rounding behind, margin lightly setose; segment 4 

 expanding distally, subequilateral; segment 5 shghtly broader than 

 long, 3 groups of stout facial spines; segment 6 short, cylindrical, 

 terminal spines long. Peraeopod 4: coxal plate with lightly setose 

 posterior lobe; segment 2 broadest distally, posterior margin smooth; 

 segment 4 short, nearly as broad as long, margins heavily plumose, a 

 few short facial spines; segment 5 quadrate; segment 6 short and 

 cylindi'ical. Peraeopod 5: coxal plate small, rounded behind; seg- 

 ment 2 orbicular, anterior margin with broad plmnose blades ; segment 

 4 slightly expanded, no posterior marginal spines ; segment 5 narrowing 

 distally; segment 6 somewhat longer, basally broadest. Brood plates 

 of peraeopods 1 and 2 with 17-19 marginal setae, of gnathopod 2 

 with 4 apical setae; brood plate of peraeopod 3 with 2 minute hairs. 



Pleosome side plate 3 with three groups of lateral plumose setae. 



