r 



BY THOS. L. BANCROFT, M.B., EDIN. 3 



sary for their well-being, and possibly they need cooler 

 and deeper water than I was able to give them. 



The fish, whether in glass cells or in the tub, rapidly 

 increased in size to three-quarters of an inch in length 

 and up to two months ; after that time they were noticed 

 to become sluggish and emaciated and began to die off, 

 and at the end of three months all had died. 



I am of opinion that were the Ceratodus reared even 

 up to two months and then liberated in a suitable artificial 

 lagoon, that a large number would survive. 



A B c D E 



A — Appearance of fresh egg, life size, 

 B — End of one we^k. 

 C — End of second week. 

 D — Empty envelope showing exit hole. 



E — Young Ceratodus just emerged ; will often go back into gelatinous 

 envelope if disturbed. 



