HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 189 



with terminal group of nonplumose setae. Accessory lobe of coxopo- 

 dite small, peripheral setae long. Maxilla 2: outer plate long and 

 slender, lunate, double the inner plate, inner margin proximally with 

 stout comb spines, distally with more than 20 plumose setae, outer 

 mar'i'in finely ciliate. Maxilliped: inner plate short, truncate apex 

 with 5 slender spines and one spine tooth on small prominence at 

 inner angle; outer plate narrow, without margmal spine teeth; palp: 

 inner margin of segment 2 slightly concave, terminal segment arcuate, 

 tip not exceeding distal lobe of segment 2. 



Gnathopod 1: coxal plate subrectangular, margin sparsely setose; 

 segment 5 strong, posterior setae simple; segment 6 uniformly slender, 

 slightly shorter than 5; dactyl short, nail a simple curved spine. 

 Gnathopod 2: segment 2 straight; segment 5 narrow, lower margin 

 proximally with a few slender setae, distally with about 10 short 

 pectinate spines; segment 6 long and slender, upper margin convex, 

 distally with slender pectinate spines; dactyl relatively large. 



Peraeopod 1: coxal plate distally broadest, margins virtually bare; 

 segment 2 strong, margins subparallel; segment 4 slightly expanded, 

 margins sparsely plumose; segment 5 short and deep, spine circlet 

 small, with about 8 spines; segment 6 pear shaped, with 9 spines. 

 Peraeopod 2 slightly shorter, less powerful; coxal plate broadly ex- 

 panded and produced posteriorly, margins nearly bare; segment 2 

 slender; segment 4 slightly expanded, upper margin nonplumose (?); 

 posterior margins of segments 5 and 6 with 3 and 1 plumose setae 

 respectively. Peraeopod 3 : coxal plate large, deep, posterior margin 

 nearly bare; segment 2 very broad, posterior marghi weakly setose, 

 anterior margin with a few plumose setae; segment 4 sub triangular, 

 longer than broad; segment 5 narrow; segment 6 cylindrical, about 

 equal to 5, facial spines short and heavy. Peraeopod 4: posterior 

 coxal lobe shallow, margin nearly bare; segment 2 broader than long, 

 posterior margui smoothly convex, nearly bare, segments 4 and 5 

 relatively narrow with 2-3 small clusters of stout facial spines; seg- 

 ment 6 short, cylindrical. Peraeopod 5 very nearly equal to 4 ; seg- 

 ment 2 very brood, strongly convex behind, nearly bare; segment 4: 

 posterior to be subtriangular, segment 6 slender, longer than subrec- 

 tangular 5. Coxal gills subcylindrical, longest on gnathopod 2, de- 

 creasing posteriorly; broad plates long and narrow on peraeopods 1 

 and 2 with about 20 marginal setae, short and narrow on gnathopod 

 2, vestigial on peraeopod 3. 



Pleosome: side plate 3 small with 3 groups of lateral plumose 

 setae. Pleopods strong, inner ramus 9-10 segmented, outer 12-seg- 

 mented, inner marginal setae short. Uropod 1 : peduncle short, stout, 

 spinose above, single (outer) ramus heavy, with 3-4 groups of stout 



