FIG. 284. 
Figs. 284-289.— Larval sharks. (Figs. 284-287 after BALFOUR.) 284. Pristiurus 
(embryo, X 5) with yolk sac (x 2). 285, 286. Larvae of Scyllium. X 4. 287. Ventral 
view of head of larval Scy//ium, slightly younger than that of last figure. 8. 288, Larva 
of Acanthias. X 4. 289. Late larva of Acanthias, X }. 
G. Gills. GS. Gill slits, PF. Pectoral fin. SP. Spiracle. Y. Yolk sac. YS, Stalk 
of yolk sac. 
216 
