terates, the Brachiopoda, Vermes, etc. As to the mode of origin 

 of the nervous system, Ussow says "1 have been compelled to 



hope of finding any resemblance to its cie- 

 tebrata, Tunicata, Annulosa and MoIIusca." 

 the ganglia of the Cephalopoda originate 



in the peripheral ganglia of the vertebrates. 

 Ussow was unable to trace the origin of the 

 nital glands, as they < 



keep his specin 



Now returning to Kolliker's memoir for our 

 information regarding the later stages, Fig. 142, 

 A (m, mantle ; 6, branchial processes ; s, siphonal 

 processes; a, mouth; e, eyes; 1-5 rudimentary 

 arms, after Kolliker) represents the disk-like em- 

 bryo resting on the surface of the yolk ; B, a side 

 view of the embryo when farther advanced (>/, 

 yolk sack; h, head), and C the same still older, 

 the yolk sac still smaller, the contents having 

 been partially absorbed. Soon after this the 

 body and arms grow longer, and the aniina 

 moves about in its shell. 



For our information regarding the still later 

 ative cuttle fishes we are indebted to the observa- 

 srriU, from whose report on the Invertebrates of 



