446 
F. A. POTTS 
Fig. 15. — Transverse section tlirongli older stolon in same series, 
showing formation of the gonads from a central mass of mesohlast. 
X 330. 
Fig. 16. — Transverse section thrcugh a mature male stolon of T. 
crosslandi. x 330. 
Fig. 17. — Ty^^ical ventral seta of T. gemmipara. X 90. 
Fig. 18. — Tyjjical ventral seta of T. crosslandi (twenty-fifth seg- 
ment). X 90. 
Fig. 19. — Parapodium of T. crosslandi. X 25. 
Fig. 20. — Head of stolon of T. crosslandi. 
