78 GENERAL SKETCH OF 



pectoral fins are well defined, rounded anteriorly and pointed 

 posteriorlj^ The liver (arising from the ventral region of the 

 gut) forms a rounded process. The heart has a trumpet-shaped 

 venous end and a boldly flexed arterial portion. The pulsations 

 are now more regular — about 2.5 per minute. Rounded black 

 chromatophores, or pigment-cells, have appeared on the head 

 and dorso-lateral region of the trunk, but they have no regular 

 linear disposition (Figs. 29 — 33). 



Fig. 33. "View of the head of the same embryo from the front. 



2'ird Apj-il, 9th day. By this time the eyes become 

 pigmented with rounded black chromatophores and the pig- 

 ment-spots of the body and tail are more numerous. Three 

 branchial clefts have made their appearance behind the ears. 

 The olfactory bulbs are connected with the nasal pits. The 

 liver has acquired an irregular lobulated appearance, and the 

 gut is a prominent vermiform structure (Fig. 34). 



Fig. 34. Nearly lateral view of an embryo of the Cod on the 9th day. 

 Almost ready to hatch. 



The violent wriggling of the embryos indicates their 

 advancement, and a few issue from the eggs this day. The 

 empty capsules retain their spherical shape though a lenticular 

 rent passes two-thirds across their diameter (Plate III., fig. 2). 



24i/i April, lOth day. Five-sixths of the embryos are still 



