34 



THE APODID^ 



PART 1 



as the sensory cirrus of the parapodium of the first 

 segment, the parapodium itself having disappeared, or 

 possibly being represented by the bulb on which the 

 antenna stands ; this latter homology is, however, very 

 doubtful. Though the parapodium itself has dis- 

 appeared, the gland of its aciculum is probably still 

 present, and functions as a salivary gland. Fig. 29 

 p. 114, shows the position and form of this gland. A 

 comparison of this figure with Fig. i will make it 



Fig. 7. — A. First antenna (Z Spiizbergcnsis) w'lih. hooked sensory hairs, homolo- 

 gous with the olfactory hairs of the higher Crustacea, c, the sensoiy cirrus ; d, 

 the bulb on which it stands, perhaps the remains of the dorsal parapodium on 

 which it stood. B. Second antenna (Z. ^'///'s/'tv-jftv/i/i) showing the rudiments 

 of the endopodite, i.e. of the distal end of the dorsal parapodium which had 

 been highly developed in the Nauplius, but is degenerated in the adult ; c, the 

 sensory cirrus. 



clear that this gland can be so homologised ;— the 

 point will, however, be discussed in detail in connec- 

 tion with the description of the gland itself. From 

 Fig. I it will be seen that the acicular gland of the 

 (vanished) parapodium of the first segment could 

 easily open within the mouth, on the under lip. 



