EXPLANATION OF FIGURES. 



The figures were dranm by means of the caméra Ittcida Abbe-Apathy. 



ABBREVIATIONS. 



FIG. 1. Vertical longitudinal section tlirough the head of the larva, showing 

 the buccal organ, h. o., and dorsal gland, d. gl. X '8°. 



FIG. 2. Buccal organ in transverse section. X •Soo. 



FIG. 3. Vertical longitudinal section through the head of an adult Lanice sho- 

 wing the muscular buccal organ in the lower lip, /. /., and the glandular "rypt, 

 g. c, behind it. X loo. 



FIG. 4. Horizontal longitudinal section of the dorsal aspect of the larva. X 56. 



FIG. 5. Transverse section through the dorsal gland of larva, showing the 

 dorsal aperture, d. ap , of gland, and the two latéral gland cells, /. gl. X 25o. 



FIG. 6. Transverse section through the dorsal gland, behind the aperture of 

 the gland. On the left a cell with its small round nucleus, nu., is shown. X 25o. 



FIG. 7. Horizontal section of the larva showing the three pairs of nephridial 

 organs, nephr. i, 2, 3. X 25o. 



