Fig. 9. — DeveJo2)ment of the suture-Une (>/'Dactylioceras 

 commune {Jigured in PI. II, Jig. 2). 



a = First suture X 28. 

 h= Second suture X 28. 

 c= Seventh suture X 28 



d = Sutm-e at 1| whorls X 28. j; = Suture at 4| whorls X 8. 

 e = Suture at 2f whorls x 15. /)= Suture at h^ whorls X 4. 

 /= Suture at 3f whorls X 1 2. / = Sutiu-e at 6f whorls X 2, 



i 



