198 The Scyphophori, Haplomi, and Xenomi 



Of the many genera of Paciliidcz, top-minnows, and killi- 

 fishes we may mention the following: Cyprinodon is made 



FIG. loo. Mayfish, Fundulus majalis (L.) (male). Wood's Hole. 



up of chubby little fishes of eastern America with tricuspid, 

 incisor teeth, oviparous and omnivorous. Very similar to 



FIG. 156. Mayfish, Fvndulus majalis (female). Wood's Hole. 



these but smaller are the species of Lebias in southern Europe. 

 Jordanella floridce of the Florida everglades is similar, but with 



FIG. 157. Top-minnow, Zygonectes notatus (Rafinesque). Eureka Springs, Ark. 



the dorsal fin long and its first ray enlarged and spine-like. 

 It strongly resembles a young sunfish. Most of the larger forms 



