THE CRUSTACEA OF NEW JERSEY. 149 



— S. I. Smith, Rep. U. S. F. Com., I, 1871-72 (1873), P- 580. Warmer 

 Atlantic (eastern United States). 



— ■ M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, No. 5, 1905, 

 p. 84. Gulf Stream off Martha's Vineyard. 



— Pilsbry, Bull. U. S. Nat. Mus., No. 60, 1907, p. 79, PI. 9, figs. 3-5. Off 



New Jersey (Albatross Station 2039; also Long Island Sound). 



Anatifa Icevis De Kay. N. Y. Fauna, Moll., V. 1843, p. 255. Bottoms of ves- 

 sels and driftwood (New York). 



— Leidy, Journ. Acad. Nat. Sci. Phila., (2) III, 1855, p. 151. Atlantic 



City and Beesley's Point, New Jersey. 



Description. — V^alves white, more or less translucent and thick, 

 tinged bluish-gray from underlying corium, or sometimes brown- 

 ish cream-colored, rarely tinged purple. Surfaces of valves 

 smooth, traces of very fine lines radiating from umbones, some- 

 times rather plain on basal part of scuta. Scuta with occludent 

 edge considerably curved or straight. Internal tooth of right 

 scutum close to umbo varies, either pointed, square or obliquely 

 truncated on either side, or with notch on summit. Internal basal 

 rim of scuta either plainly developed or nearly absent. Often 

 on scuta, or on scuta and terga, nearly straight line diagonally 

 across capitulum of slight quadrilateral depressions, dirty green- 

 ish with edges blending away, and either conspicuous or obsolete. 

 These marks increase in size from umbones to margins of valves. 

 Sometimes two or even three rows on scuta. Margins of valves 

 sometimes slightly notched on line of marks. Interspace between 

 carina and scuta and terga, not wide. Carina convex and smooth, 

 or with knobs or extremely long sharp teeth, exteriorly. Small 

 examples under half an inch generally most strongly barbed. 

 Apex more or less acuminated, width and thickness variable, 

 sides strongly furrowed. Forks generally less wide than broad- 

 est upper part of valve, two prongs diverge from each other at 

 less than right angle, their sharpness and precise form variable, 

 and rim between them reflexed to form slight notch behind. 



Peduncle smooth, wrinkled, length varies in proportion to that 

 of capitulum, from barely equal to six times as long. Filamentary 

 appendages never more than two each side, sometimes only one. 

 length variable. One placed on flank of prosoma under first 

 cirrus, and second close under basal articulation of this cirrus on 

 hind face of slight swelling. Mandibles with usual fine teeth, all 



