DEVELOPMENT 



Eggs and egg-cases of tithes. (From Dean.) A, Bdellostoma, egg-case ; 15, upper pale of 

 the same showing hooks and micropyle (after Ayers); C, Mi/xiiie (after Steenstrup); D, a 

 process of the same; E, Petromyzon marinus; F, Scy Ilium (after Giinther); G, llaja ; H, 

 Heterodontus (after Giinther); 1, Callorhynehus (after Giinther); J. Ceratodus (after Semon); 

 K, Lepidosti us : h, Jr^wnscr ; M, .t,/».v. showing larva (after Giinther) ; N, Sen-onus ; O, Alosa ; 

 P, Blennies, egg-capsules attached ; Q. the same enlarged (after Guitel). 



