LIST OF FIGURES. 



PAGES. 



9 



lO 



78 

 81 



81 



Glyptops utahensis. Carapace of type . 

 Glyptops utahensis. Plastron of type 

 Mouth of Agoniates anchovia Eigenmann 

 Predorsal spine of Stelhaprion crenatiis Eigenmann 

 Scale of Stethaprion crenatus Eigenmann 

 Diagrammatic sketch of Pcecilia vivipara, cT, showing modification of 

 last two precaudal vertebrae to form a support for intromittent 



organ ' . .98 



Diphyacantha. chocoensis Henn, distal end of intromittent organ . .114 

 Priapichthys nigroventralis (Eigenmann & Henn), distal end of intro- 

 mittent organ 115 



Heterandria formosa Agassiz, distal end of intromittent organ . .116 



Neoheterandria elegans Wenn, dxstSiX enA oi mtromittent organ . 117 



P seudo pcecilia fria (Eigenmann & Henn), distal end of intromittent organ 119 

 Pcecilopsis amates (Miller), distal end of intromittent organ . . .120 

 P/;a//o/oryw2f5/a5CJo/a/2f5 Henn, side view and anal fin of male . . 126 



PhaUotorynus fasciolatus Henn, inferior view of premaxillaries with teeth 127 

 Phallotorynus fasciolatus Henn, view from above of terminal portion of 



anal; view from below of same object 128 



Phallotorynus fasciolatus Henn, section through center of terminal of 

 anal; section through posterior portion of terminal part or scoop of 



the anal 128 



Pcecilia melanzona (Eigenmann), distal end of anal of male . . 133 



Mollienisia latipinna Le Seur, distal end of anal of male . . . .135 

 Mollienisia caucana (Steindachner), distal end of anal of male . . - 136 



Limia hoUandi Henn, distal end of anal of male 137 



Method of making a cheap ring for a net for collecting small mollusks. 480 



