THE CRUSTACEA OF NEW JERSEY. 153 



teeth under umbones either sharp and prominent or mere knobs, 

 sometimes that of right side much larger than left, again equal, 

 or sometimes left scarcely distinguishable. Internal basal rim 

 absent, barely developed. Valves of terga with conspicuous 

 notch to receive apex of scuta, tv^o occludent edges either meet 

 each other at rectangle or at much smaller angle, causing portion 

 thus bounded to vary much in outline, area and degree of 

 prominence. Carina broad, deeply concave within, edges sinu- 

 ous and sometimes strongly barbed externally, narrow above 

 wide fork, which latter wider than widest upper part of valve. 

 Prongs sharp, thin, and rim connecting prongs not, or only 

 slightly, reflexed. 



Peduncle narrow, shorter than capitulum. Filamentary ap- 

 pendages more or only one, short, obtuse projection on each 

 side, on posterior face of swelling under first cirrus. Man- 

 dibles with inferior point produced into single pectinated 

 tooth, rarely into two pectinated teeth. Palpi very narrow. 

 Maxillae very variable, formed of five steps, of which two lower 

 generally united as one, divided by mere trace of notch. Some- 

 times three lower steps blended into irregular projecting sur- 

 face with even fourth step indistinct. First pair of cirri rather 

 far removed from second pair, with longer ramus about three- 

 fourths length of shorter ramus of second cirrus. Spine-bearing 

 surfaces hardly at all protuberant. Lateral marginal spines on 

 posterior cirri rather long. Caudal appendages smooth, rounded, 

 extremely minute. 



Color in alcohol with sack -and cirri, especi-alfy first cirrus. 

 clouded with pale purple. Peduncle brownish. Valves bluish in 

 fresh examples. Capitulum six-tenths of an inch long. (Darwin.) 

 Remarks. — Distributed in the Atlantic Ocean, attached to vari- 

 ous floating objects, as wood, cork, charcoal, seaweed, spirute. 

 bottoms of vessels, bottles, etc. It is sometimes found associated 

 with Lepas anafifera and often with Lepas fasciciilaris. Leidy 

 found it at Atlantic City and Beeslev's Point. 



