298 



30O 



B 



SP 



H 



301 



B 



SP 



Figs. 296-302. Larval sturgeons. (All but Fig. 302 after KUPFFER.) Fig. 299, X 18 ; 

 296-300, x 10 ; 301, X8; 302, X 3. (Enlargement approximate.) 296, 297. Larvae 

 shortly after hatching. 298. Larva two days old. 299. Mouth region of larva of third 

 day. 300. Larva of fourth day. 301. Larva of twenty-eight days. 302. Sturgeon of 

 twelve months. 



A. Anus. AU. Auditory vesicle. B. Barbel. GS. Gill slit. H. Heart. OL. Ol- 

 factory pit. OP. Optic vesicle. PP. Pectoral fin. PN. Pronephros. 5. Mouth pit. 

 SP. Spiracle. 



222 



