198 The Scyphophori, Haplomi, and Xenomi 
Of the many genera of Peciliide, top-minnows, and killi- 
fishes we may mention the following: Cyprinodon is made 
Fig. 155.—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, Fundulus majalis (female). Wood’s Hole. 
these but smaller are the species of Lebias in southern Europe. 
Jerdanella floride 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 
