HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 177 



lined thi'oughout posteriorly with stout spines and minute serrations, 

 with a small proximal cluster of stiff setae ; 3 stout inter-ramal spines ; 

 outer ramus with about 10 posterior spines and inner ramus with 

 about 4, Uropod 2: rami slender, setose apically, about equal to 

 stout peduncle. Uropod 3: rami slender with long apical spines; 

 terminal segment of outer ramus nearly equal to peduncle. Telson 

 with shallow, sharp V-cleft, lobes each with 5 unequal apical spines. 



Male, 5.0-6.5 mm.: Similar but smaller than female. Antennae 2 

 noncalceolate. 



Remarks. — Protohaustorius mgleyi occurs generally throughout the 

 Georges Bank region, from the northeast slope and Cape Cod Bay 

 southwards, from the shore line to more than 30 fathoms in depth. 



Parahaustorius, new genus 



Medium to large animals ; head short, broadest posteriorly ; rostrum 

 strong, acute; antennal sinus deep. Body broad, lateral lobes of 

 peraeon well developed. Pleosome abruptly narrowing behind peraeon 

 7, segment 2 broadest, hindmargin of 3 segment free, not decurved 

 nor reflexed; side plates rounded behind. Urosome moderately 

 strong, not overhung by pleosome; postero ventral lappet moderately 

 developed ; urosome 2 very short and much narrower than urosome 1 . 



Antenna 1 : peduncular segments short and deep, anterior marginal 

 setae simple; flagellmn relatively long, accessory fiagellum 2-seg- 

 mented. Antenna 2: peduncular segment 4 broadly lobate, segment 

 5 stout; fiagellum long, segments small. 



Coxal plates 1-3 semilmiate, distally narrowing and subacute; 4 not 

 produced behind in subacute lobe. Gnathopod 1 powerful, dactyl 

 simple. Gnathopod 2: segment 5 lacking ventrodistal pectinate 

 spines; segment 6 not tumid. Peraeopod 1 : segment 5 deeply lobate. 

 Peraeopod 2: segment 5 short, narrow, segment 6 with marginal 

 spines and plumes. Peraeopod 3 relatively small, barely half as long 

 as peraeopod 4 and 5, which are exceptionally large and powerful. 

 Peraeopods 3-5 : segment 4 and 5 broad, surfaces richly spinose and 

 setose. Peraeopod 4: segment 4 (merus) elongate, segment 6 slender, 

 sublinear. Peraeopod 5: segment 5 with long posterior margin. 

 Coxal gills large, slightly smaller posteriorly. Brood plates of peraeon 

 2-4 large, broad, that of peraeon 5 short, slender; marginal setae 

 numerous, short, slender. 



Pleopods strong, rami slender, outer 18-24 segmented, inner about 

 15-segmented. Pleon side plate 3 rounded posteriorly, with marginal 

 cluster of plumes only. Uropods biramous. Uropod 1 very strong; 

 peduncle stout, posterior margin spmose, inter-ramal spines very large; 

 rami unequal, inner shorter, spinose behind. Uropod 2 and 3 sub- 



