THE CRUSTACEA OF NEW JERSEY. 151 



Station 2714, N. Lat. 38° 22', W. Long. 70° 17' 30"; Albatross Station 

 2715, N. Lat. 38° 29' 30", W. Long. 70° 54' 30". 

 Anatifa anserifera De Kay, N. Y. Fauna, Moll., V, 1843, p. 254, PI. 34, fig. 315. 

 New York harbor (on ships' bottoms). 



Description. — Capituluni more or less elongated relatively to 

 breadth. Valves white, thick, closely approximated and surfaces 

 variably furrowed. Terga generally more plainly furrowed than 

 scuta, of which basal portion generally less furrowed than upper 

 part. Ridges often rough, generally much narrower than fur- 

 rows, variable, sometimes alternately wide and narrow, range 

 from eighteen to thirty-two. Scuta with occludent edge rounded, 

 variably protuberant, always leaving rather wide space between 

 edge and ridge running from umbo to pointed apex. Right- 

 hand internal tooth considerably larger than left, which often 

 reduced to mere ridge. Internal basal rim thick, sometimes 

 furrowed along upper edge, thickness variable, sometimes not 

 extending far as basal carinal angle. Terga two-thirds 

 to equal to scuta length. Young with two occludent edges 

 forming right angle with each other. Older examples 

 have form less than right angle, and thus portion of valve so 

 bounded unusually protuberant. Carina deeply concave within, 

 exterior sides finely furrowed longitudinally, generally denticu- 

 lated. Valve only slightly narrowed in above fork, of which 

 prongs wider than widest part of valve. Rim between prongs 

 reflexed, and heel or external angle just above fork sometimes 

 considerably prominent. 



Peduncle generally about long as capitulum, generally short in 

 young. Filamentary appendages five usually, sometimes six, on 

 each side. One placed on side of prosoma and four others in 

 pairs below basal articulation of first cirrus. Lowest posterior 

 filament of four generally largest. Young with upper pair of 

 four, often not developed or represented by mere knobs. Cirri 

 with longer ramus of first pair almost equal to shorter arms of 

 second pair, and spine-bearing surfaces only slightly protuberant. 

 Caudal appendages smooth, curved, pointed. 



White valves edged with bright orange membrane, and so 

 close together that no interspaces left, colored from under- 

 lying corium. Peduncle dark orange-brown, uppermost part 



