HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 203 



segment 5 very short, lobe circlet with 5 spines and 5 plumose setae; 

 segment 6 slender, with 8 spines and 3 setae. 



Peraeopod 3 relatively large, length more than % peraeopod 4. 

 Coxal plate deeply lobate, hindmargin weakly setose; hindmargin of 

 segment 2 nearly straight, proximally setose; segment 4 about as 

 ■wide as long, outer face with 6-7 clusters of spines; segment 5 much 

 narrower, 3-4 spine clusters; segment 6 short and stout, terminal 

 spines long. Peraeopod 4: coxal plate small, posterior margin 

 oblique, setose below; segment 2 relatively narrow, setose proximally; 

 segment 4 triangular, posterodistal margin with 3-4 long spines; 

 segment 5 subquadrate, distal margin straight, perpendicular to long 

 axis, anterior marginal spines long; segment 6 short, linear, 3 posterior 

 spine clusters. Peraeopod 5: coxa shallow, subtruncate behind; 

 segment 2 large, orbicular, posterior margin bare, anterior margin 

 distally with long bladelike setae; segment 4: posterior lobe short, 

 acute, hindmargin very short, 1 spine group; segment 5 triangular, 

 posterior margin distinct, 1 spine group, anterior marginal spines 

 elongate, cleft tipped; segment 6 short, cylindrical, terminal spines 

 long. Posterior coxal gills short, saclike. Brood plates on peraeo- 

 pods 1 and 2 narrow, about 20 marginal setae, short and slender with 

 8 apical setae on gnathopod 2, a small plate A\'ith 2 apical hairs on 

 peraeopod 3. 



Pleon side plate 3 with short, weak, posterior spinous process. 

 Pleopod rami short, broad, outer 13-segmented, inner 9-10 segmented. 

 Uropod 1 : peduncle long, evenly spinose posteriorly ; 3 moderately 

 strong inter-ramal spines; inner ramus much shorter than outer, 

 hindmargin with 3 singly inserted setae; outer ramus with terminal 

 cluster of long spines. Uropod 2: rami and peduncle subequal, 

 some setae plumose. Uropod 3: rami subequal, segments of outer 

 ramus subequal. Telson broad, narrowly cleft almost to base, lobes 

 apically with a few slender setae. 



Male, 3.5 mm.: similar but smaller than female; calceoli on first 

 4 flageller segments of antenna 1 elongate, each about equal to 2 

 flagellar segments. 



Remarks. — Several features of this species (e.g., relatively small 

 outer plate of maxilla 2, short terminal segment of maxilliped, weakly 

 expanded peraeopods, short spinous process of pleon 3, and short 

 inner ramus of uropod 1) are intermediate between the condition in 

 primitive haustoriids (e.g., Protohaustorius) and the condition in 

 highly specialized members of the genus Haustorius; hence, the specific 

 name intermedins. 



The species is known only from the Cape Cod region and occurs 

 sparingly from the shoreline (in Cape Cod Bay) to more than 20 

 fathoms (on Georges Bank). 



