THE CRUSTACEA OF NEW JERSEY. 381 



Carapace depressed, broadly pyriform or lyrate, not spinose on 

 dorsal surface. Rostral spines dilated, vertically compressed, 

 acute, nearly in contact along their inner margins. No preocular 

 spine. Orbits shallow, somewhat open above, with hiatus or 

 fissure in upper and lower margins. Post-abdomen distinct,, 

 seven-jointed both in male and female. Eyes short and partially 

 visible in dorsal view, when retracted. Basal antennal joint not 

 greatly dilated, unarmed, next joint slightly dilated and third 

 slender. These, with flagellum, visible from above at sides of 

 rostrum. Merus of exterior maxillipeds distally truncated, 

 antero-external angle rounded and not prominent, and antero- 

 internal angle, where next joint articulates, scarcely emarginate. 

 Chelipeds (in male) of moderate length, palm slightly compressed 

 but not carinated, and fingers nearly straight, acute, scarcely 

 toothed on inner margins and with scarcely any intermarginat 

 hiatus when closed. Ambulatory legs subcylindrical, of moderate 

 length, and dactyli nearly straight, acute. 



Species not numerous, mostly of arctic or sub-arctic regions. 



Hyas coarctatus Leach. 



Plate 113. 



Toad Crab. 



Hyas coarctatus Leach, Trans. Linn. Soc. London, XI, 1815, p. 329. Seas of 

 Britain, Frith of Forth, Plymouth Sound and Salcombe. 



Verrill, Rep. U. S. F. Com., I, 1871-72 (1873), p. 504 (on sandy and 



gravelly bottoms). 



— S. L Smith, Rep. U. S. F. Com., I, 1871-72 (1873), p. 548. New 



Jersey to Cape Cod and northwards. 



S. L Smith, Trans. Conn. Acad., V, 1879, p. 43. New Jersey, Long 



Island Sound, Block Island Sound. 



■ S. I. Smith, Proc. U. S. Nat. Mus., Ill, 1880, p. 414- N. Lat. 40° W. 



Long. 70°, in 86-115 fathoms. 



S. I. Smith, 1. c, VI, 1883, P- 5- Off Middle States in 31 to 15& 



fathoms. 



S. I. Smith, Rep. U. S. F. Com., XIII, 1885 (1887), p. 626. N. Lat. 



40°, W. Long. 69°, in 18-33 fathoms. 



M. J. Rathbun, Proc. U. S. Nat. Mus., XVI, 1893, P- 69. Off Middle 



States. 



