182 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



long and narrow, liindmargin short, oblique, with 1 spine cluster; 

 segment 5 widest nadially, length of posterior margin more than half 

 the anterior, 2 spine clusters present; segment 6 subequal, slender, 

 wider proximally. 



Pleon side plate 3, lower margin evenly and smoothly convex; 7 

 clusters of lateral plumose setae, 3 to 6 per cluster. Pleopods: 

 peduncles squarish to broad rectangular; outer ramus 19-segmented, 

 slightly longer than 15-segmented inner ramus. Uropod 1: peduncle 

 stout, strongly arched, posterior margin lined with stout spines, prox- 

 imal protruberance with a very strong spine and a row of 6 stiff 

 setae; 2 stout inter-ramal spines; outer ramus heavier and longer than 

 inner, both terminated in a cluster of long spines, and bordered 

 behind with shorter spines. Uropod 2 : rami slender, subequal, setose 

 throughout, longer than peduncle, which is simply setose distally. 

 Uropod 3 : rami long and slender, fine spinose terminally, outer ramus 

 distinctly longer than inner, terminal segment about equal to the 

 peduncle. Telson finely cleft halfway to base, lobes smoothly 

 rounding. 



Female, 10-13 mm.: Similar to male but larger. Flagellum of 

 antenna 1 without visible calceoli. Brood plate of gnathopod 2 

 short and broad, that of peraeopods 1 and 2 very large, of peraeopod 

 3 slender, short, with 10 marginal setae. 



Remarks. — Holmes' description (1904, p. 476) and figure of 3rd 

 uropod and telson unquestionably apply to this species. His photo- 

 graphic plate V (fig. 2) is that of the true Haustorius arenarius (Slabber) 

 and probably is based on specimens from Devon, England, which he 

 compared with American material. Despite the many differences 

 (several of generic value) which he himself noted, he concluded that 

 the Em'opean material was specifically identical with the American 

 form. The size range (up to 18 mm.) considerably exceeds material 

 of H. holmesi examined but equals the largest H. canadensis at hand. 

 This large distinctive species is named in honor of the man who first 

 described it and who contributed so greatly to North American 

 carcinology at the turn of the century. 



This species ranges offshore, usually in depths of 10-20 fathoms, 

 from Georges Bank southwards. 



Parahaustorius attenuatuSf new species 



Figures \g, 3c, 4e, 14, 15 



Material examined. — New Jersey, sta. 156 [no other data]: 

 1 9, holotype, 19, paratype (USNM ace. 115760). New York, 

 off Block Island, USFC Sta. 828, 1880: 1 9, ov. (USNM ace. 38612). 



