PLATE VI. 



Page 

 Pig. 1. TEEEBELLA LITTOEALIS 288 



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



tube 317 



Fig. 3. FISSIPAEOUS REPRODUCTION OF PEOTULA 317 



Fig. 4. ClEEATULUS BOEEALIS 327 



Fig. 5. APHEODITE ACULEATA 330 



Fig. 6. AEENICOLA PISCATORUM 335 



Fig. 7. NEEEIS (PHYLLODOCE) LAMINOSA. 



a, 6, c, d. Development of Nereis 320 



