eigenmann: the cheirodontin^. 



9 



words, in five species there may be a deviation of one tooth from the normal, in ten 

 species there may be a deviation of as many as three teeth (Aphyocharax seven to 

 ten), and in one (Odontostilbe melandeta) there may be a deviation of as many as 



Fig. 1. Types of teeth and their variations in the Cheirodontinae. a, mandibular tooth of Grundulus; 

 b and &', premaxillary teeth of Macropsobrycon; c-c-, premaxillary teeth of Aphyocharax anisitsi, c, the sym- 

 physeal tooth, c\ the second, and c^, the third tooth from it; d, mandibular tooth of Mcgalamphodus megalop- 

 terus; e, mandibular tooth of Spintherobolus; f and /', a mandibular and premaxillary tooth of Parecbasis; g 

 and g', a maxillary and premaxillary tooth of Prionobrama; h-K , entire set of mandibular teeth of an Oligo- 

 brycon microstomus; i-i", entire set of premaxillary teeth of a Megalamphndus microptcnis, i and i', the usual 

 type, i*, with incipient cusps on the sides of the median cusp; j-/, entire set of premaxillary teeth of an Aphyo- 

 cheirodon; f and /, active mandibular teeth of an Aphyocheirodon; /", relay tooth, wliich has not pierced the 

 gum of an Aphyocheirodon; k, k\ k°, k^, a mandibular tooth, a premaxillary tooth, and two maxillary teeth of 

 Compsoura heterura; 1-V-, a premaxillary and a maxillary tooth of a Cheirodon piaba. 



