i84 REPORT OF NEW JERSEY STATE MUSEUM. 



coarsely spinous at truncated tips. Second pair much smaller, 

 with rami setous. Last pair with rami slender, linear, outer 

 biarticulate and longer than inner, both set out at tip. Telson 

 forms broad plate, slightly incised in middle. 

 A single species. 



Haustorius arenarius (Slabber). 

 Plates 53 and 150, Figure 9. 



Oniscus arenatius Slabber, Nat. Verl. Micros. Waarn. Haarlem, 1769, p. 92, 

 PI. II, figs. 3-4. Dorpe Oost-kappelle, op Iiet Eiland van IValcheren. 



Oniscus arenarius Slabber, 1. c. (nom. in index). 



Haustorius arenarius Holmes, Amer. Nat., XXXVH, 1903, p. 279. Arctic 

 America to Virginian province. 



Holmes, Bull. U. S. Bur. Fisher., XXIV, 1904 (1905), p. 476, fig. 



Georgia to Cape Cod. ■' 



Paulmier, 58 Rep. N. Y. State Mus., VI, 1904 (1906), p. 157, fig. 25. 



Bayshore and Freeport, N. Y. 

 Lepidactylis dytiscus Say, Journ. Acad. Nat. Sci. Phila., I, pt. 2, 1818, p. 380. 



Georgia. 

 LepidactxUs ditiscus Bate, Cat. Amph. Crust. Brit. Mus., 1862, p. 112 (on 



Say). 

 Lepidactylus dytiscus Verrill, Rep. U. S. F. Com., I, 1871-72 (1873), p. 339. 



Burrows in sand at low water. 

 S. I. Smith, Rep. U. S- F. Com., I, 1871-72 (1873), P- 556. Georgia to 



Cape Cod. 



Description. — Head with short triangular rostrum. Eyes 

 small, nearly round. Both pairs of antennae short, and peduncle 

 of first pair with numerous plumose setae and secondary fliagellum 

 over half length of primary. Last two joints of second an- 

 tennal peduncle compressed and much dilated, lower edges 

 fringed with long plumose setae, and penultimate joint several 

 times larger than last one and produced into rounded lobe at 

 anterior lower angle. Flagellum not exceeding peduncle of 

 second antennae. First four coxal plates increasing successively 

 in size, first three concave behind, strongl}^ convex in front and 

 tapering below to rather obtuse point. Fourth coxal plate 

 larger than others, concave behind, strongly convex in front 

 and broadly rounded below. Gnathopods rather small, carpus 

 widened at middle, larger than propodus, which very thickly 

 setose and bears small terminal dactvl which much reduced 



