BY C. HEDLEY. GU7 



Explanation of Plates (continued). 



Fig. 23. — Genital system of G. leei. 



Fig. 24. — Two rows of nine teeth from the centre, and of the twenty-third 

 to the twenty-seventh from the margin, of the radula of G. 

 louisiadensis. Much magnified. 



Plate xli. 



Fig. 25. — Jaw of G. boyeri. Magnified. 



Fig. 26. — Genital system of G. boyeri. 



Fig. 27. — Genital system of H. broadbenti. 



Fig. 28. — Jaw of G. woodlarhianus. Magnified. 



Fig. 29. — Two rows of nine teeth from the centre, and of the forty-eighth 

 to the fifty-first from the margin, of the radula of G. rollsianus. 

 Much magnified. 



Fig. 30. — Two rows of eleven teeth from the centre, and of the twenty - 

 second to the twenty-sixth from the margin, of the radula of 

 H. musgravei. Much magnified. 



Fig. 31. — Jaw of G. brumeriensis . Magnified. 



Fig. 32. — Genital system of G. tooodlarhianus. 



Plate xlii. 



-Genital system of G. trobriandensis. 

 -Jaw of S. simplex. Magnified. 



-Two rows of eleven teeth from the centre, and of the thirty- 

 fourth to the thirty-eighth from the margin, of the radula of 

 H. broadbenti. Much magnified. 



-Two rows of eleven teeth from the centre, and of the seventeenth 

 to the twentieth from the margin, of the radula of G. tuood- 

 larkianus. Much magnified. 



-Two rows of eleven teeth from the centre, and of the nineteenth 

 to the twenty-second from the margin, of the radula of S. 

 simplex. Much magnified. 



-Lower portion of the genital system of N. divisa, var. inclinata. 



-Genital system of N. hnnsteini. 



