220 Field Museum of Natural History — Zoology, Vol. X. 



Text Figures. 



1. Diagram showing the peculiar scaling at base of caudal fin of the 

 male of Compsura gorgoncB (Evermann & Goldsborough) . 



2. Front teeth of Compsura gorgoncB (Evermann & Goldsborough). 

 (After Evermann & Goldsborough.) 



3. Front teeth of Pseudocheirodon affinis gen. et sp. nov. (After 

 Ckeirodon insignis [non Steindachner] Evermann & Goldsborough.) 



4. Distal part of intromittent organ of Gamhusia nicaraguensis 

 Gunther. (Greatly magnified.) 



5. Distal part of intromittent organ of Gamhusia episcopi Stein- 

 dachner. (Greatly magnified.) 



6. Distal part of intromittent organ of Priapichthys tridentiger (Gar- 

 man) . (Greatly magnified.) 



7. Distal part of intromittent organ of Priapichthys dariensis (Meek 

 & Hildebrand). (Greatly magnified.) 



8. Distal part of intromittent organ of Priapichthys panamensis sp. 

 nov. (Greatly magnified.) 



9 . Distal part of intromittent organ of Pceciliopsis elongaius (Gunther) . 

 (Greatly magnified.) 



10. Distal part of intromittent organ of Mollienisia sphenops (Cuvier & 

 Valenciennes). (Greatly magnified.) 



