HIGHER CRUSTACEA OF NEW YORK CITY 



157 



terior pereiopoda more or less dissimilar in structure and adapted 

 for burrowing in soft bottoms. Uropoda all biramous, the last pair 

 generally unlike the others. 



A family which possesses great abilities in burrowing ; and the 

 pereiopoda are correspondingly greatly modified. The one species 

 taken probably has the most extreme development in that direction. 



Hailstorms arenarius (Slab.) 



O n i s c u s arenarius Slabber. Katurkunde Verlustigingen etc. p. 92, 

 pi. 2, fig. 3 and 4. 



Lepi dactyl us dytiscus Say, T. /. c. 1818. p.380. Verrill. /. c. 

 1874, P-556. Smith, S. I. Ct. Acad. Arts and Sci. Trans. 1880. 4:282. 

 H a 11 s t o r i u s arenarius Sars. /. c. 1895. p.135, pl.46. 



Antennae with long and plumose hairs. Posterior pereiopoda 



very broad and without dactylus. 



Fig. 25 Haustorius arenarius 



This species can not be confounded with any other found on our 

 coast. Its peculiar form, in which it somewhat resembles the sand 

 bug, Hippa, and the character of its appendages, cause it to be 

 the most rapid burrower of our coast. 



Length 10—12 mm. Cream or sand colored. 



Taken at Bayshore and Freeport and will probably be found in 

 the sand along the bays, near high water mark. 



Family ampeliscidae 

 Body compressed anteriorly. Eyes generally four. Antennulae 

 slender, without accessory rlagellum, and placed at anterior end of 

 head. Antennae somewhat larger and placed farther back. Last 

 two segments of abdomen fused. Third pereiopoda different from 



