HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 205 



Upper lip smooth. Lower lip : inner lobes short, broad ; outer lobes 

 smoothly romicling, inner margin with about 7 well-spaced bristles. 

 Mandible: incisor and lacinia short, unicuspate; 8 accessory blades 

 and 1 supramolar blade; palp segments 2 and 3 slender, subeciual; 

 comb row of 20 short spines; 13 slender terminal spines. Maxilla 1: 

 inner plate with 12 dendritic marginal setae; outer plate with 11 spine 

 teeth; palp short, setae simple; accessory baler lobe moderately 

 strong. Alaxilla 2 longer than broad, inner margin with 18 proximal 

 spines and 20 distal plumose setae; inner lobe long and narrow. 

 Maxilliped inner plate with 12 marginal bristles; outer plate broad, 

 with strong inner marginal spine teeth; palp slender; segment 2: 

 apical lobe with straight outer margin, inner margin with minutely 

 pectinate, curve-tipped setae. 



Gnathopod 1: coxal angle broadly rounded, plumose; segment 

 2 slender; segment 4 powerful, posterior marginal setae clavate; 

 dactyl with simple terminal nail. Gnathopod 2: coxal angle broad, 

 plumose; segment 2 very slender, sinuous; segment 4 slightly ex- 

 panded, with 4 groups of posterodistal pectinate spines; segment 6 

 very slender, chela relatively large. 



Peraeopod 1: coxal plate deep, semilunate; segment 4 distally 

 expanding, margins distally plumose ; segment 5 long, with 14 marginal 

 spines and 2 plumose setae; segment 6 with. 10 spines and 3 plumose 

 setae. Peraeopod 2: coxal plate broad, posterior marginal sinus 

 moderately deep; segment 2 linear; segment 4 short, expanded, 

 margins plumose; segment 5 small, ^dth 6 marginal spines and 4 

 plumose setae; segment 6 with 10 spines and 3 plumose setae. 



Peraeopod 3 : posterior coxal lobe slightly the larger, weakly setose 

 behind; segment 4 slightly broader than deep, with 5 groups of facial 

 spines; segment 5 narrower, with 1 group of posterior spines, segment 

 6 stout, terminal spines not exceptionally long. Peraeopod 4: 

 segment 2 nearly smooth behind; segment 4 short with 2 rows of 

 facial spines, posterior margin concave proximally, convex distally, 

 and armed wdth about 5 strong spines; segment 5 quadrate, distal 

 margin perpendicular to axis, anterior marginal spines long; segment 

 6 linear with 4-5 posterior spine groups. Peraeopod 5: coxal plate 

 deep, posterior lobe short, acute; segment 2 orbicular; segment 4: 

 posterior lobe moderately produced, tapering to short posterior 

 margin bearing 3-4 slender spines among plumose seatae; segment 5 

 with few facial setae, anterior marginal spines long, cleft tipped; 

 segment 6: marginal spines long. 



Brood plates of peraeopods 1 and 2 long and broad, with 35-40 

 marginal setae; that of gnathopod 2 much shorter, with 12 distal 

 setae; that of peraeopod 3 forming a slender lobe Avith 4-5 posterodistal 

 setae. Anterior coxal gills slender, elongate. 



