HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 193 



broad, shallowly V-cleft behind, lobes each with 12-13 stiff, slender 

 posterior setae and 2 groups of lateral setae. 



Kemarks. — The present material was compared with the type male 

 specimen of Pseudohaustorius americanus (Pearse), from Cameron, 

 La. (USNM cat. 38340), portions of which are illustrated herewith 

 (fig. 5c) and in Pearse (1908, p. 29). In the type of P. americanus, 

 antenna 1 is damaged and the accessory flagellum appears to retain 

 a minute basal fragment of a terminal segment, thus making the 

 appendage 2-segmented. In maxilla 2, the distal margin of the outer 

 plate is oblique. The terminal segment of the mandibular palp is 

 short. In peraeopod 4, segment 4 is relatively short and broad, 

 segment 5 longer than broad, segment 6 weakly spinose behind. In 

 peraeopod 5, the coxal hindlobe is very large, the hindmargin of seg- 

 ment 2 irregularly convex, the hindlobe of segment 4 short, truncate, 

 with 2 marginal spine groups, and the posterior border of segment 5 

 apparently long. Terminal spines of the rami of m-opod 1 are short, 

 pectinate. Outer ramus of uropod 3 1-segmented. Telson distinctly 

 V-cleft apicaUy. 



P. caroliniensis is related closely to P. americanus (Pearse), particu- 

 larly in the shape of peraeopod 5 and telson, but is distmct in possessing 

 a small but definitive terminal segment on the outer ramus of m-opod 

 2. Although recorded from New England by the present material, 

 the species recently has been found in selected habitats of the estuaries 

 of the Carolinas and Georgia. The specific name caroliniensis alludes 

 to the principal zoogeographic affinities of the species. 



The species is restricted ecologically to surf-protected muddy sand 

 bottoms that are kept moist at low water by beach seeps or tidal 

 runoff. When distm'bed or trapped in the net, the animals appear very 

 sluggish and crawl much more slowly than associated species of 

 Haustorius, Acanthohaustorius, and Parahaustorius. Despite intensive 

 search in 1963, the species was not rediscovered at the type locality. 



Pseudohaustorius borealis, new species 



Figures le, 2/, 4h, 20, 21 



Material examined. — Albatross-lQl, sta. 86, 41°14', 67°28', 

 Smith grab, 24 fms., Aug. 24, 1957: Icf, holotype, 19, allotypes 

 (NMC 7064); same locality: 19, 1 imm., paratypes (NMC 7065). 



Cape Cod region, off Pasque Island, Quick's Hole, coarse sand, 

 grab at 45 ft., Sept. 18, 1963: 1 9, ov. (MBL, author collections). 

 Off Cape Cod, 41°48', 66°48', April 10, 1953: 7 subadult; same 

 locality, 41°24', 66°44', April 10, 1953: 1 9, 2 imm.; Albatross-69, 

 coll. 1, 41°52', 69°60', Van Veen, Nov. 15, 1955: 5 adult; Albatross- 

 101, sta. 68, 41°30', 68°28', Smith gi'ab, Aug. 22, 1957: 7 imm.; 



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