J. Wyman on some unusual modes of Gestation. 13 
The above observations apply to Njinge- njinge. With regard 
to Jarra-bakka, I had but few opportunities for dissection, but in 
several instances the same conditions of ‘the eggs were noticed 
as stated above; and in one instance, besides some nearly 
mature foetuses contained in the mouth, two or three were 
Squeezed apparently from the stom hah but not bearing ~ 
marks of violence or of the action of the gastric fluid. It 
probable that these found their way into that last cavity after 
eath, in consequence of the relaxation of the sphincter which 
separates the cavities of the mouth and thestomach. These facts 
lead to the conclusion that this is a mouth gestation, as the eggs 
are found there in all stages of development, and even for some 
time after they are hatched. 
The question will be very naturally asked, how under such 
Pie these fishes are able to secure and ‘swallow their 
fi ave made no observations bearin q 
tion. Unless the food consists of very minute particles, it would 
seem necessary that during the time of feeding the eggs should 
be disgorged. If this supposition be correct, it would give a 
very probable explanation of the only fact which might be con- 
sidered at variance with the conclusion stated above, viz., that 
we have in these fishes a mouth gestation. In the mass of e eg 
with which the mouth is filled, I have conesiontelly Ty fhe the 
eggs, ees more than one or re of another species. The 
when the ova are recovered, th egg of another species 
‘may be introduced into the saduith's care those which naturally 
belong there. 
Fig. 5 y sony a nearly mature foetus of the natural size from the 
mouth of Bagrus, with the yolk sac partially included in _— cavity of 
