116 



ZOOLOGY 



takes place, as it were, on top of the egg (Figs. Ill, 112). 

 Eyes and mouth appendages early make their appearance; 

 then the other appendages, and the tail (Fig. 113). For 

 a long time the back of the thorax is greatly distended by 

 the yolk stored there, and the eyes are huge (Fig. 114). 



Immediately after hatching, the young lobster is about 

 one-third of an inch long. The eyes are still abnormally 

 large, the telson is spatulate, and the abdomen is without 



FIG. 113. Surface view of embryo FIG. 111. Lobster embryo. 01 days 

 with all of thoracic appendages old ; eyes have developed pigment, 



formed. The forked telson partly X 15. From Herrick. 



overlies the brain. Note the large 

 eyes, which are yet without pig- 

 ment. Embryo about 21 days old. 

 X 25. From Herrick. 



swimmerets. On account of its resemblance to the Schizop- 

 oda, the larva at this stage is known as the " Schizopod 

 larva' (Fig. 115). In moulting for the fourth time, the 

 exopods are lost from the future walking appendages, and 

 the animal resembles a lobster except for its small size (Fig. 

 115a). During these early moultings the young lobsters 

 undergo a terrible mortality, so that out of ten thousand 

 embryos hardly two, on the average, survive. After the 



