22 



ACALEPHJE 



3. Rhizostoma. Branching mouth-bearing processes from manubrium ; sense tentacles. Absence 

 of velum and tentacles. 



4. Pelagia noctiluca. Note the 16 gastral pouches. Gonads; marginal notches and sense 

 tentacles ; 8 long marginal tentacles ; sub-genital pits. 



5. A Hydratuba or Scyphistoma. 



