No. 26.] ARTHROSTRACA OF CONNECTICUT. 175 



Gnathopods very unequally developed, the first pair being 

 small. Second pair much elongated with propodus exceedingly 

 large and with palm divided into acute lappets. First two pairs 

 of pereiopods wholly absent. Three posterior pairs strongly 

 developed and similar, with propodus large and expanded at 

 base. Gills present on only the third and fourth thoracic seg- 

 ments. 



Abdomen with two pairs of appendages in both sexes. 



longicornis (Kroyer). 



FIG. 53. JEginella longicornis. 



1842-3. JEgina longicornis Kroyer, Naturhist. Tidsskrift, 

 I Rakkes, 4 Bind. 



Body slender, smooth or spiniferous, head often furnished 

 with a pair of dorsal spines. 



Eyes small. 



