190 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



posterior spines and longer apical spines. Uropod 2: ramus spatu- 

 late, slightly longer and more slender than nearly bare peduncle. 

 Uropod 3 : rami subequal, weakly setose apically, longer than peduncle, 

 Telson very small, entire, with 2 short spines and a seta on each 

 side of the slightly emarginate apex. 



Male, 3.5 mm.: Somewhat smaller and more slender bodied than 

 female. Antennae 1 with 1 elongate calceolus per flagellar segment. 

 Gnathopods relatively shorter and stouter than in female. 



Remarks. — The animal occurs at low-water level of open sandy 

 beaches from the southeast side of Cape Cod Bay and outer coast of 

 the Cape, southwards to Georgia and northern Florida. 



This remarkable species is named in honor of Dr. Eugene H. 

 Schmitz, in whose littoral marine amphipod collections from the 

 Beaufort region the species was first identified. 



Pseudohaustorius, new genus 



Small to medium-sized haustoriids. Head very short and broad, 

 lateral margins subparallel, rostrum and lateral head angles broad, 

 inferior antennal sinus shallow. Lateral lobes of peraeon pronounced. 

 Pleosome abruptly narrowing beyond peraeon 7; segment 2 broadest; 

 posterior margin of segment 3 strongly reflexed below, side plate 3 

 with posterior spinous process. Urosome very short; urosome 1 very 

 wide, overhung by pleosome, postero ventral lappet short; urosome 2 

 very short, dorsal margin nearly occluded by 1 and 3, nearly as broad 

 as urosome 1. 



Antenna 1 : peduncular segments very short and broad, segment 2 

 heavily plumose anteriorly; accessory fiagellum 2-segmented. Anten- 

 na 2: segment 4 deeply lobate behind; flagellar segment 1 elongate, 

 plumose. Upper lip broad, apically subtruncate. Lower lip: inner 

 lobe large, rounded. Mandibular incisor unicuspate, lacinia 1-2 

 cuspate, accessory blades few (3-4) ; palp stout, comb row long. 

 Maxilla 1: inner plate small, marginal setae few, simple, accessory 

 lobe vestigial or lacking. Maxilla 2 : outer plate small, distal margin 

 scantily plumose. Maxilliped short, inner plate small, palp very 

 broad, terminal segment clavate. 



Gnathopods slender, coxae broad. Gnathopod 1 : dactyl with 

 stout subterminal spine. Gnathopod 2: segment 5 with elongate 

 pectinate spines below. Peraeopods 1 and 2 powerfully fossorial, 

 posterior lobe of segment 5 large, spinose and setose. Coxal plates 

 deep. Peraeopod 3: segments 4 and 5 extremely broad, short, 

 Peraeopod 4 : segment 5 articulated near anterior margin of segment 4 ; 

 segment 6 spatulate, Peraeopod 5: coxal plate large, segment 5 with 

 distinct posterior margin. Coxal gills smallest posteriorly. Brood 

 plate on peraeopod 3 vestigial. 



