HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 185 



setae, smaller on gnathopod 2, short and slender and with 8 long 

 marginal setae on peraeopod 3. 



Pleon side plate 3 smoothly convex below and rounded behind, with 

 5 lateral clusters of 5-9 plumose setae and about 4 anterior singly in- 

 serted setae. Pleopod 3: 20-segmented outer ramus distinctly longer 

 than 16-segmented inner ramus. Uropod 1: peduncle stout, strongly 

 arched, posterior margin nearly smooth except for proximal hump 

 bearing a large spine and a row of about 12 stiff setae; 2 very large and 

 strong inter-ramal spines, longest nearly % the inner ramus; outer 

 ramus longer and heavier than inner, both with slender posterior 

 marginal and terminal spines. Uropod 2 larger and stouter than 3. 

 Uropod 3: outer ramus somewhat longer than inner, terminal segment 

 shorter than peduncle. Telson very broad, apex with shallow V- 

 cleft, posterolateral angle of each lobe with about 10 slender spines. 



Male, 10.5 mm.: Similar to female but smaller. Antenna 1: 

 flagellum without calceoli. 



Remarks. — This large species occurs from the shoreline to depths of 

 more than 20 fms., from the northeast slope of Georges Bank south- 

 wards to New Jersey. It is taken frequentlj^ in the same bottom 

 sample as P. holmesi, a remarkable ecological phenomenon considering 

 the close morphological similarity of the two species. 



Neoliaus tortus, new genus 



Small haustoriids. Head very short and broad, rostrum weak, 

 inferior antennal sinus present, lateral margins subparallel. Body 

 very broad, arched above, lateral lobes of peraeon long. Pleosome 

 very short and broad, abruptly narrowing behind peraeon 7, hind- 

 margin slightly deflexed, side plates rounded behind. Urosome stout, 

 longer than pleon 3 but not overhung by pleosome, ventral lappet 

 broad, short; urosome 2 as long as 3, narrower than urosome 1. 



Antenna 1: peduncular segments short; flagellum with clusters of 

 elongate calceoli in both sexes; accessory flagellum 2-segmented. 

 Antenna 2: peduncular segment 4 and 5 deeply lobate behind; first 

 flagellum segment elongate. 



Upper lip broad, smooth. Lower lip: inner lobes elongate, slender. 

 Mandible without incisor, lacinia monocuspate, accessory blades few 

 (3-5) ; palp stout, comb row short. Maxilla 1 : inner plate with bifid 

 setae; accessory lobe moderate. Maxilla 2 broad, elongate, semi- 

 lunate, inner margin distally plumose; inner plate long, narrow. 

 Maxilliped plates short and broad, palp segment 3 geniculate. 



Gnathopods slender, coxal plates small, rounding below. Gnatho- 

 pod 2: segment 5 with pectinate spine groups. Peraeopods 1 and 2 

 weakly fossorial, segment 5 with small posterior lobe. Peraeopods 



