IV 



EGGS AND LARV.E AND THEIR DEVELOPMENT 



95 



cephalus\ witch or pole dab ; all of which belong either to the 

 cod family or the flat-fish family. Of these eggs that of the 

 plaice is the largest, being about T V inch in diameter, and that 



FIG. 45. 



FIGS. 45-48. Diagrams of the chier types of floating marine fish-eggs. 45. Egg of 

 Plaice, Cod, &c., with undivided yolk. 46. Egg with simple yolk and single o 

 globule. 47. Egg of Sole with yolk beneath the germ divided into segments and 

 groups of minute oil-globules. 48. Egg of Pilchard, with yolk wholly divided 

 and also a single oil-globule. G, germ ; O G, oil-globule ; Y, yolk ; Y S, yolk 

 segments ; M, micropyle. 



of the dab is the smallest, being less than ^ inch ; the rest are 

 of sizes intermediate between these. 



A large number of sea-fishes have eggs which differ from these 

 only in the presence of a single large oil-globule, situated not in 



