PLATE VI. 



Page 

 Fig. 1. TEREBELLA LITTORALIS 288 



Fig. 2. PROTULA. a. The animal removed from its 



tube 317 



Fig. 3. FISSIPAROUS REPRODUCTION OF PROTTJLA 317 



Fig. 4. ClRRATTTLUS BOREALIS 327 



Fig. 5. APHRODITE ACULEATA 330 



Fig. 6. ARENICOLA PISCATORUM 335 



Fig. 7. NEREIS (PHYLLODOCE) LAMINOSA. 



a, b, c, d. Development of Nereis 320 



