346 Dana on the Classification of Animals 
codrdinate with that of Decapods. Being codrdinate with Brachy- 
urans and Macrurans, the change of name is necessary. 
b. The Tétradecapods include two divisions precisely parallel 
with the first two of the Decapods, the first literally brachyural, 
the second macrural. (See p. 335 of this volume.) The Aniso- 
corresponds in position to a suture or imperfect articulation in 
the carapax of the Caligi, etc.)—Fourth, the Rotifers, a low Pro- 
small number of segments present, when any are distinct, the 
character “the dentate mautdibles (for mandi ib les are not found = 
