,,^r««^''.*?*-'^^ 





Kv 





%:^ 



w 



/4 



"TTv 



-^a 



PLATE V. 



Figure- 17. 'J'uvKiNA balsana (Meek) ; type, Rio de las Balsas, Balsas, Guerrero. 

 Figure 18. Thyrina evermanni Jordan & Culver; type, Astillero de Rio Presidio, 



Mazatlan. 

 Figure 19. ErRvsiOLi-: ?:Ki.\RrHA (Jordan & Gilbert); type, Mazatlan. 

 Figure 20. Chirostoma mkzouital Meek: type, Durango. 



