414 PROCEEDINGS OF THE ACADEMY OF [1879. 



and stouter than the second pair, which in turn are shorter than 

 the remaining pairs; the carpus two articulate. Type Concordia 

 gibberosus, sp. n. 



Concordia gibberosus, sp. n. (Plate xiv. fig. 5). Carapax with 

 the dorsum strongly elevated, and armed with five spiniform teeth; 

 the first of which is on the rostrum, the last at about the middle 

 of the carapax; carapax between the teeth ecarinate; rostrum 

 very short, not exceeding the short and stout eyes; antennula? 

 with two very short flagella, the outer swollen and ciliate ; an- 

 tennal scale extending slightly beyond the peduncle of the anteu- 

 nula?; flagella short, small, regularly tapering, about twice the 

 length of the carapax. First pair of pereiopoda short, stout; 

 fingers about as long as the palm, second pair longer and more 

 slender; carpus two-jointed, first joint longer than the meros, and 

 about twice as long as the second, remaining feet slender, elon- 

 gate, the propodal joints with a few spines on the posterior mar- 

 gin ; daetyli short, curved, with spines on the concave margin ; 

 abdomen strongly bent at the middle ; telson narrow, tapering, 

 sides straight, extremity acute. 



A female with eggs from Fort Macon was about 8 mm. long. 



Sub-Family Gnathophyllinae. 



Second pair of pereiopoda larger than the first pair, external 

 maxilliped broad, operculiform. 



o Genus Gnathophylluai, Latr. Rostrum short, compressed, 

 antennulse with two very short flagella, carpus of the second pair 

 of pereiopoda not annulate. 



Family ATYIDiE. 



Mandibles stout, not palpigerous, crown broad, dilated, slightly 

 divided. Second pair of maxillipeds short and broad; first two 

 pairs of pereiopoda nearly equal, the carpus of the second not 

 annulated. 



Sub-Family Atyinae. 



Pereiopoda without exopodite. 



o Genus Atya Leach Rostrum short, depressed ; antennula? 

 biflagellata; external maxillipeds small, slender; first two pairs of 

 pereiopoda similar, carpus lunate, bearding the propodus on the 



