PARENTAL CARE AMONG FRESH-WATER FISHES. 531 



them, and carries them hack to the protective (Iwcllins. This surveillance lasts 

 until the embryos, having undergone their comjilete evolution, h.-ive ac(iuired 

 strength and agility. Their numerous and t're(|uent flights announce to the 

 male the end of his troubles, which <-onies about eight or ten days after the 

 sinking of the nest. 



The same pair of fish gave me three oviposit ions diu'ing the snniiuer of 1sT-"i, 

 each consisting on the average of l.~)() ova. 



Tlie embryos of the Iv.ninb.iw tisli undergo a series of Ir.insforniations 

 analogous to those which I first indicated as occurring in .l/r/r/f>/>of/»s-. Want 

 of time and dread of affecting the existence of animals which are still rare pre- 

 vented my following this investigation with all the attention that the subject 

 deserves ; but I propose to resume it hereafter. 



All M. Carbonnier's observations on the fish were made in Paris, in 

 small aqnaria c(mtaining' abont 15 liters, the temperatiuv of the water 

 being kept at 23 to i>5° C. (= 73.-i° to 77.77° F.). 



