382 REPORT OF NEW JERSEY STATE MUSEUM. 



Stebbing, Hist. Recent Crust. (Int. Sci. Series LXXIV), 1893, p. 114. 



North Atlantic. 



M. J. Rathbun, Amer. Nat., XXXIV, 1900, p. 510. Cape Cod to 



Hatteras (Virginia province). 

 — Mayer, Sea Shore Life, igo6, p. no. Arctic Ocean to New Jersey. 



Hyas coarctata De Kay, New York Faun., Crust., VI, 1844, p. 3, PI. 7, fig. 

 14. New York. 



Haldeman, Bridges and Zantzinger, Proc. Acad. Nat. Sci. Phila., 1850, 



p. 28 (name only). 



Leidy, Journ. Acad. Nat. Sci. Phila., (2) III, 1855, P- I49- Great 



Egg Harbor, N. J. 



Description. — Carapace width about one and two-thirds its 

 length, rather well depressed, with rather lyriform contour as 

 viewed above. Upper surface of carapace with some rather large 

 tubercles, arranged somewhat triang'ularly, with apex median and 

 directed forward. Rostrum dilated as two long- subequal. nar- 

 rowly triangular spines, greatly depressed, and inner edges not 

 in contact. Supraorbital ridge or flange moderate, entire, and 

 with deep notch posteriorly separating rather broad hepatic 

 flange. Latter directed anteriorly in sharp point, and posteriorly 

 rounded. Eyes globular, greater than thickness of peduncle 

 except basally. Antennules small, placed in depressions below 

 bases of rostral spines. Antennas moderate, and basal joint ex- 

 tends forward about half way in length of rostral spines, without 

 large tubercle at outer front angle. Folded outer maxillipeds 

 cover buccal mass in area much deeper than wide, with rather 

 long ischium, its distal end rather long and pointed, 

 and inner edge setous. Merus about wide as long, 

 with few sharp thorns on outer surface. Similar thorns on 

 surfaces of ischia, but usually as- well-defined series near outer 

 edges. Ridge extends back obliquely on side of body from upper 

 edge of meri of outer maxillipeds. Male with moderately long 

 chelipeds, dactyl half length of propodus and its end in apposition 

 with that of poUex, though cutting-edges form slight hiatus with 

 a series of weak tubercles along each. Palm somewhat con- 

 stricted above, rounded and swollen a little below, sides convex. 

 Carpus about long as pollex, with ridge surmounted by several 

 tubercles on upper surface. Merus rather long, though less than 

 length of propodus, and two ridges on lower surface and another 



